Quadzilla Banshee Tear Down. What Went WRONG?!

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I completely disassemble my Quadzilla Banshee Hybrid quad to see if I can find out why it keeps blowing up. #Quadzilla, #Banshee, #500cc,
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The following video features activities performed in controlled environments by knowledgeable persons. DO NOT attempt to duplicate, re-create, or perform the same or similar activities at home, as personal injury or property damage may result. 2vintage( Joe Weber, the persons shown in this video and ANY CONTRIBUTOR, ARE NOT LIABLE FOR ANY such injury or damage. ALL 2vintage( Joe Weber) CONTENT IS FOR ENTERTAINMENT PURPOSES ONLY.
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Опубликовано:

4 янв 2022

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Комментарии : 552

@jimnewell5472 2 года назад

I’ve been building 2 stroke engines for nearly thirty years and can tell you now that them crank bearings need replacing I could hear they were gone straight away, also the rod is incorrectly installed as thrust washers are missing would also check crank alignment. Cylinder and head have been decked which is causing the the piston to get squashed. Double up on base gaskets will solve this which is a pretty standard thing to do is this situation. Also when checking squish don’t use wire so thick as this could of caused damage to the piston which would make rings stick

@bramvanhautte5112 2 года назад

What exactly does 'being decked' mean?

@jimnewell5472 2 года назад

It’s when the mating surfaces of a cylinder, cylinder head or crankcase get damaged due to people using screwdrivers to separate the parts. You then machine a very small amount of material off to make surface flat again. When sound this to a cylinder it can cause problems if you don’t know what your doing. That’s why the piston is sitting higher than the cylinder which can be fixed by using two base gaskets. When you buy a gasket set for a Ktm they come with 3 different thickness base gaskets to adjust the compression ratio which comes in handy also if cylinder has been decked. Hope this helps

@gtisid 2 года назад

@@jimnewell5472 would thickening up the base gasket alter the port timing ? this is an issue with aprilia rs 125s and some builders lower the squish by machining the top of the cylinder.

@dennisbrooks186 2 года назад

@@gtisid Joe would need to put a degree wheel on, and figure out where the port timing is at, compare that to a stock unmolested motor and go from there. Nobody knows whether to add thicker gaskets or machine top of cylinder b.c. nobody knows what's been done, and where the port timing is at. I'm an at home diy builder and even I know that lol.

@boru-cnc 2 года назад

You are absolutely correct Sir!

@MM_in_Havasu 2 года назад

If your piston is above deck upon assembly(clay the piston to verify clearance), make a spacer plate of the same thickness(and also compensating for gasket thickness on either side)and get the deck height set properly. The bottom end is not your problem if the crank rotates smoothly in the cases. You would feel a sloppy bearing. That con rod is perfect, it is centered on the crankpin by the piston itself. Suzuki has done that for years with many of their 2-stroke engines. You could get a 0.020" thickness spacer made from copper, check with Cometic or other mfg. companies. That's what I think your main problem is. You should also be able to hone that cylinder out and have it work correctly, and water pumper 2-strokes actually do better with more piston clearance than an air-cooled engine. I discovered this with a CR500 in late '80's setting one up for desert racing, had to clearance the piston at least 0.0015 more than recommended and also built a deck plate to bolt on in place of the cylinder head which made for a true round bore when the head was torqued on. That bike did an honest 115 mph and never melted even at top end on the mainjet. Great content, Joe, keep up the good work and the good fight reviving these quads and dirt bikes!

@jadams833 2 года назад

Crazy how there doesn’t seem to be anything wrong with the bottom end. But there has to be a reason why it’s eating Top ends. Amazing job as always. Really looking forward to seeing it up and running again

@ryangamble3351 2 года назад

The cylinder has been "decked" and the position is hitting the head gasket ever so slightly....that why the ring lands were smashed along with allowing a bit of coolant into the bore and caused the scoring.....I've been through this on a lt250 that had a bunch of cylinder work, double up that base.

@ryancraig2795 2 года назад

Exactly what I was thinking. Needs a thicker base gasket, for whatever reason.

@s2meister 2 года назад

I agree, also if the rod is not to spec and is just a few thou long it will also jam the piston.

@juicy5836 2 года назад

Correct

@lastofthebest5102 2 года назад

Wouldnt want to buy the correct parts or anything huh? Always some Moronic Clown with a half ass "fix", which ultimately fails. Ignorance abounds.

@BlastWorrior 2 года назад

the side play is not right, there need to be washers between the conrod and the crankshaft because the conrod is led by the washers, if it moves to much your piston will tilt in the cylinder. maybe get some engine drawings and see what is missing i would do that first. but the washers definetly need to be there. btw happy new year

@mrmcbacon4343 2 года назад

exactly what i thought

@heapsy2083 2 года назад

Exactly!

@jstephens1193 2 года назад

Page 3-25 of the manual.

@jasonratliff9566 2 года назад

I agree. That's a bit too much side to side play.

@1tommyking 2 года назад

Thought same thing

@jonmccormick8683 2 года назад

You need to get a "telescoping guage set" (Harbor Freight) or maybe even a newer digital one and get the correct size to measure your bore. Get out a sheet of paper and measure top, middle, closer to the bottom. Then turn another 30 degrees and measure all 3 again -do this for a full 360 deg. =Looks like a cold seizure and not enough clearance. Or this cylinder has ovaled out due to being resleeved to many times (most likely the case). You can only resleeve a two-stroke 1-2 times before it starts to oval out. Find out what the cylinder specs are from the Suzuki LT500 manual.

@lucasmoseley1467 2 года назад

It wasn’t resleeved it was bored so I don’t think that would be the issue

@enallane5538 2 года назад

by "resleeve" I assume you mean hone, because a resleeve would be a new cylinder that's perfectly round.

@jonmccormick8683 2 года назад

@@enallane5538 No even with a new sleeve the heat warped cylinder will "oval" it. =You can only resleeve a cylinder so many times. There are sleeves that can be replaced and locked in or the older 4 strokes with the thick sleeves.

@jacquesbezuidenhout4882 2 года назад

Here we go, so the top of the piston touches the head gasket/head as it expands and heats up when running causing it to knock the ring grooves closed making the rings stick/seize. Thats just my take on this, so the piston needs to be trimed or spaced. Good luck 🤙🏻

@rustrenegade8191 2 года назад

Two issues. First I believe your cylender has been decked a little to far and is causing the piston to hit the head. I'd throw a thicker base gasket on to help. Second I have never seen a crank without washers on each side. Alot of play there. Yes it's normal for the crank to move side to side a bit however that was ALOT of play.

@razza219 2 года назад

100% right, that crank needs rebuilt

@MrATOMBOMB420 2 года назад

Clearly you know nothing about the quadzilla cranks they have thrust washers on the piston and of the connecting rod not the crank end of the connecting rod completely shows your inexperience and non-knowledge of two strokes

@MrATOMBOMB420 2 года назад

@@razza219 clearly you and the person that you agreed with know nothing about what you're talking about Suzuki cranks on quadzillas don't have thrust washers on the big end of the connecting rod they have thrust washers on the piston side of the connecting rod or the small end whatever you want to call it the only way to get rid of those thrust washers is to run a piston from an RM 250 or rm500 depending whether you have an LT250R or lt500r but both those bikes from Suzuki have the thrust washers on the small end of the connecting rod completely shows your inexperience and lack of knowledge

@briancrull8678 2 года назад

Where r the thrust washers on the lower con rod bearings ? Not seeing any so will give side play creating twist

@motoxjim929 2 года назад

I was thinking the same thing thats way to much side play.

@bananabrooks3836 2 года назад

Good stuff Joe and that you're not giving up. This engine problem is proving to be an interesting and worthwhile exercise in failure analysis and theories, Engine has not "blown up" it has seized, a "blow up" would mean there has been explosive activity, you then usually need replacement cases or cylinder and cubic dollars.

@apollosmoon8658 2 года назад

With those leaving the negative remarks I'll leave a big positive. I love your videos because of how thorough you are. You go through everything from top to bottom to find hidden issues. I work on these things too and I know from a recent purchase of a used clapped out bike it's just better to put your eyes on everything just like you are doing, ruling out everything. Keep up the awesome vids!

@timothyzhelnovakov5586 2 года назад

I would take the engine all apart and follow a diagram and make sure you have everything together like it was from factory

@peteramberley9952 2 года назад

I agree totally with Mark. It's screams at you what happened the piston sticks out way to high out the barrel. When you turned the engine over first rebuild and the engine locked up I would put my mortgage on the outside of the dome of the piston was hitting the head. You forced it round and it crushed the ring groves and if it was the top ring that was the sticky one then that would reinforce my theory as that took the impact. And of course when the engine got hot they could not centralise on the piston evenly and got the partial seizure.

@petemartus8876 Год назад

Your a great mechanic, don't even read the negative comments bro.ive seen you figure tough problems. Stay positive

@tayloratwell4205 2 года назад

Hey Joe, I think since you have had a lot of issues with this engine. It would be a great opportunity to show everyone how to complete a proper 2 cycle Leak down test after you reassemble prior to starting. That is one of the first things I do after buying a used 2 stroke. Keep up the great work!

@aarondejonge7411 2 года назад

Keep it up, can't wait to see it running!!

@maxpayne4370 Год назад

Love this series, you never know what will happen in the next episode :)

@2vintage 2 года назад

Leave suggestion on what you think went wrong with this quad! I will be reading all replies! Thank you! Here is the piston I used to rebuild the quadzilla. Thinking about going with a different piston next time. Wiseco piston: amzn.to/33dKXx6 Please SUBSCRIBE and LIKE the video if you enjoyed! It really helps me out a lot! Check out my Instagram: 2_vintage_ Thank you for all the support!

@davep7478 2 года назад

definitely the con rod too long

@easylee1417 2 года назад

Put a new full bottom end in it . Don't take the risk of buddy would had before you shotty work

@davep7478 2 года назад

or you need a stack of base gaskets, don't think the piston should come up above the bore

@joewilson413 2 года назад

Perhaps the barrel has been skimmed before due to overheating because of the water leak..... Needs a thicker have gasket.

@ohuigin9249 2 года назад

@2vintage I guess you didn't see my message, I can tell you exactly what happened an why. When you get a cylinder back or even after honing. When you wash it you need to get your hand in there an scrub it clean. Swishing an rinsing won't get the left over from honing an boring. After you wash an scrub the cylinder use a clean paper towel an wipe it. It will leave black on the paper towel so you need to keep cleaning it till you wipe it an there isn't any black being left on the cylinder. If you don't the crud is abrasive left over from the honing an if it's not cleaned well you end up getting stuck rings an scratches. Just as you had happen. One other thing. When you drop a cylinder on you never want to twist it so that it lines up, by turning the cylinder like you did on that assemble causes the rings on one side to have the ring gap forced right against the ring gap center pin an will cause the rings to stick an cause cylinder scratching. I am sure that's the first time you have turned the cylinder like that an probably didn't know that's a no no. So just make sure you get the cylinder clean an check with the paper towel wipe an leave the reed cage an intake boot off when dropping the cylinder on. So it drops down lined up. On the piston smacking the head more time than not it's caused from a missing alignment shim causing the cylinder to be moved forward it back a couple millimeters but it could also be the other owner has the cylinder deck shaved a little. To fix that you just need to use a oem base gasket that has the small bead of black silicone on it, thicker or even doubling up 2 base gaskets to get more thickness. Then might have had the cases decked/ shaved because it had bad scratched or the replace one side of three case an had it done because they didn't line up even. Either way thicker base gasket will fix that. They do make different sizes so you can alter the squish band. Good luck, it's a cool machine I want to see you get it going trouble free.

@brodyooo6890 2 года назад

I personally agree with everything your saying dosent sound like it’s sucking air and the crank looks perfect this would stump me too man sucks it’s such a cool machine

@peteraitken6494 2 года назад

Hope you get it fixed joe it's a nice quad seeing a lot of comments on washers are missing from the rod causing play in the piston plus thicker head gasket for clearance maybe something to look at mate a lot of good comments on this hopefully that's what the problem is take care and all the best 🔧🔧🔧👍👍

@devinlawson4093 2 года назад

Nice summary and coverage of possible issues from the comments. Get that cylinder lifted up with some base gaskets and jetting set properly and it should be good. As far as the cylinder height, there is usually an overall measurment from the mfg to verify how much its been milled. When the bottom of it gets shaved, it lowers it along with all the ports which totally messes up your port timing too. Raising it up will restore that and get you proper head clearance. Piston was probably lightly tapping the head which crushed the ring grooves and caused the piston scuffing.

@turner9605 2 года назад

Try a thicker base gasket, check ring gaps and put more 2 stroke oil in it at least for the run in period. Great fix on the puller btw👍

@MaNNeRz91 2 года назад

The inside of that engine looks sweet 👌 love the blue I think it looks better than the red and super glossy from the oil

@11GalleryATV 2 года назад

I do not miss those cold ass days! I am from Northern Illinois but now I live in Phoenix, AZ. Was 67° and bright sunshine!

@megamindtvsydney3967 2 года назад

Was waiting for this

@andrewarsenault4062 2 года назад

U have a lot of patience Joe. You’ll get it right keep at it

@corym.4971 2 года назад

Only gonna mention this because it was a problem I ran into on my first liquid cooled 80cc 2-stroke rebuild which required an overbore, and something I was looking for in the videos but was cut; I installed the head gasket how a tab on the gasket lined up to a cutout on the case but it in fact needed to be flipped so the tab didn't line up. The effect was the cylinder was getting starved for coolant because the small holes in it were where the big holes were supposed to be. The result was piston/cylinder scoring near the exhaust port within the first few minutes of running. Looked like a no-brainer but was actually a gotcha and to this day I wonder where I should have been able to find that info as even the repair manual wasn't detailed enough to note that orientation. Good luck, and that crank definitely needs some TLC.

@1982HondaATC70 2 года назад

The case to cylinder surface has been milled down a lot as you can see at 31:09 where the paint is missing or has been sanded down in the location where the top case bolt goes through.(see the base gasket surface closest to the camera? Beneath that you can see the paint is missing on the case top. You need to compensate for this with either 2 base gaskets or if they sell a thicker gasket.

@bradwilsey9426 2 года назад

I’d double check squish. I definitely agree on the thicker head gasket.

@troyrosenbaugh9935 2 года назад

Check and make sure your crank isn't separating. Just had one a 1990 cr 500 do it. It's had a rough life was an old Tomac ranch play bike, everyone rode it.

@kleksriders1772 2 года назад

Maybe you could raise the cylinder and head with a thicker cylinder gasket. When building mopeds sometimes that's required and it works, maybe it can woth on a 500 haha.

@snafuequals 2 года назад

Yup

@troyrosenbaugh9935 2 года назад

Doing clut h side always pull foot brake lever off, saves a lot of smashed fingers.looks pretty smooth.

@mattoaida 2 года назад

Looks like a lot of side to side play on the connecting rod. I'd just download the lt500r manual and see the specs. I think it blew up because the cylinder was hitting the head.

@Guadzilla459 2 года назад

Where you download it at going to need this when rebuilding mine

@deedadon7142 2 года назад

I’m feelin the intro

@TheRealCozy 2 года назад

I would add the new crank seals forsure just to be in safe side but man what a beautiful beast to be so close to breathing again

@dertballls5162 2 года назад

So I’m not going say anything crash but I’ve worked on lt500s for about 6 years and my opinion is that there is a stroker crank and stock cylinder, piston, and head causing the piston to slap the head and the symptoms are Knocks and cutoffs

@mdturbo764 2 года назад

The crank might be out of balance, it happens when you use a hammer to drop the crank into the bearings, so when it's out of balance the piston moves weird in the cylinders thus blowing up

@MrATOMBOMB420 2 года назад

This problem could 100% being avoided had clearances been measured on your end you wouldn't be going through this mess

@jasonolmsted4147 2 года назад

Probably need to stick with the junkyard salvage and avoid the performance quads if your not properly checking things and just throwing it together kinda winging it. Tolerances I believe wasn’t checked as everyone else said the first time it blew up.

@MrATOMBOMB420 2 года назад

He doesn't listen to anybody that actually has knowledge I know exactly why it blew up clearance when a piston scuffs on the four corners that is what's called a cold seizure the piston swells up faster than the cylinder can expand this is quite common with forged pistons and steel sleeved cylinders it's not quite as bad in plated cylinders as they can expand faster and you're 100% right he should stick to the junkyard salvage shit because he doesn't have the knowledge to build high performance quads where the very slightest clearance that's too tight and you're done I had a $2,000 Banshee Cub cylinder chip the plating in less than half an hour it was the players fault but shows you that things can happen on even expensive cylinders but he needs to take the quadzilla motor out of it put a Banshee motor back in it sell the quadzilla motor to someone that knows what they're doing and just beyond his way riding the Banshee a good built Banshee motor will put a way more power than a quadzilla motor any day no matter what porting is done to the quadzilla motor

@mattstewart222 2 года назад

Why dont you make some videos and we'll critique your job

@MrATOMBOMB420 2 года назад

@@mattstewart222 I do this stuff for a living I don't have time to worry about a goddamn camera and angles and editing and all that bullshit it would slow me down way more than the value of the video would ever be worth I can make 10 times as much money in the period of time it would take me to film I can make that money doing work and putting vehicles and ATVs out the door instead of worrying about filming every fucking thing

@jeffreyk5933 2 года назад

Thanks to your quality video camera, I can see that the top of the case has been machined. The lowered cylinder is causing the piston to hit the head. You can notice this best by how close the raised print "... STROKE" is close to the machined surface for the cylinder base.

@pats6381 2 года назад

I wonder if someone machined the sealing surface on the top of the cases. It is a trick to lower the cylinder and reduce transfer and exhaust port duration. Seems odd the bolt boss by the base gasket sealing surface wouldn’t have paint on it. Would result in the piston sticking out too far with a stock rod and piston compression height. I enjoy the channel!

@ericprovenzano4919 2 года назад

Had a similar situation, was a bent rod. Below up the motor twice before I figured it out.

@jimnewell5472 2 года назад

Just to add to this some manufacturers shim con rods from bottom and some from top. If there is side to side movement at crank end then there should be little to no play at piston.

@hectorrivera1046 2 года назад

I can't wait to you get her to 💯 she will make a great video

@Razor6On3 2 года назад

Joe use a sharpie and color the head in and put it back on. Cycle the piston up and down a few times and pull the head back off and look for witness marks in the sharpie

@thetwostrokerebuilder 2 года назад

Bottom end looks great. Looks like piston might be hitting the head gasket. And make sure your ring gap isn't to Small on next piston. Those cranks don't have thrust washers like modern cranks . Have thicker ones same size as bearing

@MM_in_Havasu 2 года назад

Dang, someone who knows that Suzuki didn't use thrust washers on their big end rod bearings! The piston centers the rod on the crank. On the same page with you, 2 stroke rebuilder!

@troyrosenbaugh9935 2 года назад

That crank bearing thing can get spendy fyi. What isee it looks pretty solid but only has to spin a bit to throw rod up . Love watching you work, wish I had 3 of you here, I could actually run my shop and not be busy all the time...

@MrATOMBOMB420 2 года назад

That bolt that you were having a hard time getting off or the nut I should say is reverse thread you're cranking it tighter you have to go the way you would normally tighten it up to loosen it reverse thread

@vwsandvettes3253 2 года назад

I'm in favor of the possibility that the piston to head clearance is insufficient. The head may have been "milled down", which would also cause higher compression and the need to run high octane gas. If this turns out to be the issue, can you measure to see how far out the cylinder the piston extends at full stroke, then stack head gaskets accordingly, to increase the piston to head clearance, and thereby, have the side-effect of lowering the compression back down to be able to use pump gas? Lots of "assumptions" in this comment, but just my .02. Good luck. Now I will watch the rest of the video!

@joemusicman64 2 года назад

Agree. You saved me lots of typing. Milled down.

@troyrosenbaugh9935 2 года назад

Still think crank bearing area moving at some point, may feel good and tight but I've seen it happen. 2 strokes are high rpm so they can do some wierd stuff.

@unclesprinkles6692 2 года назад

The side to side play is completely normal, it’s just for lubrication purposes. I rebuilt one and had the same concerns with the side to side play but it’s all good.

@charlesmyers2762 2 года назад

Only way to know crank seals are new is to replace them. Quite a bit cheaper than a piston. That rid moves quite a bit side to side.

@chugger9636 2 года назад

The lt500 doesn't have thrust washers on the big end of the rod just smaller thrust washers on the piston pin to align the rod on the crank. I believe the bottom of the cyl was machined down for the lower port timing or for a repair. If it were me I would get billet thrust washers and the correct wrist pin bearing for the thicker washers and then call cometic and get an array of base gaskets ranging from .020 to .059 to try and get the squish were it should be. Also I'd get a few different head gaskets in various thicknesses and get them for an overbored cylinder. Please put new crank bearing and seals in there while you have it apart.

@ggjesus5667 2 года назад

Check if there is a plus one crank because most people put stroker cranks in 2 smokes to get more power

@karl6823 2 года назад

Joe I’ll tell you this one has me stumped but the first thing I would do is change that crank seal out on the stator side, I would definitely contribute to the carburetor if it was me I’ve never seen something blow up so fast without sucking air from somewhere I’m convinced it was from the carburetor

@myguitaryourface5160 2 года назад

Mike Sabo I believe says that people have been know to put bronze bushings between the crank bearings and case's

@jimmy1life 2 года назад

✌️ happy new years

@tomalealso 2 года назад

your right, it is difficult to see from this point of view, I am wondering if the center case gasket surface is good or not. yes, typically an air leak should make the motor idle hight but it is also possible to overcome than but running a larger pilot jet, especially if it is a small leak. I seem to remember that suzuki does not use a center case gasket but uses a special cement to seal that surface. If the motor was ever too hot it is not impossible that the center cases are warped just a little, just enough create a small air leak. good idea to replace the main bearing seals. I am wondering if someone milled either the cylinder to eliminate a warped base gasket surface, not impossible, I had one that did. I ended up dressing it by hand and then I ended up adding more gasket material to compensated for the difference. checking deck height would be important as well.(deck height = top of piston to top of cylinder at TDC Japanese bike typically do not have this issue but you never know who was in this motor before you or just what they were thinking. the other thought i had was that the cylinder was bore out of alignment. but since you had the cylinder done, that is unlikely.

@georgegoulborn4162 2 года назад

all below coments are correct! there should be no side to side play. like everyone else is saying I also thing the piston is hitting the top. re-measure. I would double up on the bottom and top gaskets to make sure.

@m8fusion712 2 года назад

Great video

@snafuequals 2 года назад

Lot of knowledge in these comments, pretty impressive tbh

@chriseason2785 2 года назад

Check to see if the crank haves are parallel. That will cock the piston weird in the cylinder.

@andrewkiwi1 2 года назад

Inf the rod was bent you would get spiral marks on the piston skirt starting at 90* to the wrist pin. From just below the rings down.

@charliemcdowell9113 2 года назад

Hopefully you get it running man

@michaelbiel7473 2 года назад

My kids 2015 yz 450f crank berings had no play but when they got taken out you could shake them and they made alot of noise

@davidcallahan5157 2 года назад

I don’t know if it’s just me but That crank bearing sounds kind of loud! Might want to get the clay out and check your piston to head clearance .also check ring end gap? And totally agree I will put the crank seals in there while you’re there!

@masonkermicle9534 2 года назад

You might Look into the shims for the crankshaft big end and small check all tolerances and follow the guide you should be fine

@shawnmcdonald0028 2 года назад

Hi Joe i think that the block was decked so a thicker gasket on the base and on the head might work but the block loohs to have been surfaced

@billy6ization 2 года назад

The thicker base gasket will help. Just one thing though. Make sure the counter balance is matched to the piston. There should be a guide on how to match it at least there is on cars. I've worked on many Honda preludes that have a counter balance similar to what you have. If they are not timed right and if they are not matched to the weight of the pistons and the crank they can destroy pistons, crack piston rings, over stretch the rods,and destroy crank and rod bearings and many more things. I would do some research into it if I were you. It might sound stupid but unfelt vibrations in an engine can cause stupid things to happen. Good luck. Hope you solve the issue.

@Brandonp95 2 года назад

Hey man I know you might eventually figure this out on your own but if Sabo happens to offer help with this engine you might wanna hear what he has to say 🤷🏼‍♂️

@250race 2 года назад

He is still learning to bud

@cheto2952 2 года назад

He won't

@cheto2952 2 года назад

@@250race dude both these guys are good but Sabo is better, Sabo tears his engines down to nothing rebuilds it better. This guy he's good but he cuts a LOT of corners attention to the little details is non existent. Buys cheap parts off ebay, if this guy would go the extra mile and do things right he would be awesome. And one more thing I also think if he would get off the floor and work on a table or workbench he could do better. But you can lead a horse to water but you can't make him drink.

@sedrickturner6899 2 года назад

There were metal shavings in the crank area I would replace crank bearings n get OEM crank or connected rod kit there should never be any shavings in crank area

@250race 2 года назад

@@cheto2952 They both need to start running oem bearing and cranks.

@Thor555555 2 года назад

don´t know about this engine, but for some engines to tune up there are cranckshafts available that have 1-3 mm more stroke than the stock once, than you will need a thicker (0.5-1.5mm) bottom sealing to lift up the cylinder. maybe this is such a crankshaft whithout a thicker bottom sealing so check the hight of the stroke topend to bottomend. Maybe the cylinder once got milled to raise up compression by someone so measure the hight of the cylinder to make shure it´s the same as a stock one.

@pugs7772354 2 года назад

the piston is hitting the head still, just enuf to crush down on the rings to make them stick but not enuf to feel when u kick it over.

@winmagmoon7776 2 года назад

sometimes the rings have a slight taper and if flipped wrong way they will stick in.Just something to check out as i have seen this on some machines.

@2012richj 2 года назад

me personally i think i would be checking on those piston to cylinder clearances it looked bit of a tight fit and that conrod needs thrust washers I've never seen any 2stroke without them or with that much play side to side, so in short i would change crank bearings and seals, conrod kit with the washers, piston kit and double check the clearances on piston and as a few have said if you think piston is hitting use a temp custom spacer and double up the base gasket one either side can always be removed at a later date

@MaNNeRz91 2 года назад

I think it might have been running too lean and lacked a nice rich run-in session to seat the rings properly. Rapid heat increase with lack of lubrication would expand the rings to maximum tolerances 🤷🏻‍♂️🤷🏻‍♂️ always run richer on a fresh engine especially in cold environments 👌

@scoptimusprime7382 2 года назад

I would be checking the bottom of the crank side to side play measurements! That side play looked massive?

@68-72mmALKYstyle 2 года назад

Should’ve left it a Yamaha! Not you but the guy b-4 you! Keep up the hard work and determination Brosky

@jessebrown9046 2 года назад

Look at the size of the bore! god damn, make sure you leak test and it holds 6psi for 6mins at least, and check the squish gap I just rebuilt my Dt200L engine and put it in my Blaster, with working ypvs. I havent rode it yet just 3 heat cycles and filled it with coolant and got the air out of the system

@timslaght1976 2 года назад

So all things considered after watching the full vid… I would definitely say the piston is contacting the head just enough after warming up that it is being mushed down against the rings just enough to grab the rings and score the cylinder… I wouldn’t even attempt another start on that engine until you get a bit more clearance between the head.

@ryooperdude3144 2 года назад

My quadzilla on the factory sticker by the gas cap says to run it at 20:1 gas mixture. New oil probably can go leaner but on a new rebuild I would mix it rich anyway. The worst would be a fouled plug.

@murrayminimotors1674 2 года назад

Check the bolt studs one could be bent they might not be square all the way around all four sides making a cylinder shift in the Piston rubbing and seizing up on you got a YZ80 did the same thing to me couldn't figure it out after I rebuilt it three times

@ruipisco2272 2 года назад

There is two possible problems! The cylinder wall is not thick enough yo dissipate the heat, but the major problem is that the piston is hitting the head… to solve this I suggest that you make an 2mm copper gasket for the bottom of the cylinder and put 1 paper gasket between each side… this will solve your problem! Nice videos!

@jlucier59 2 года назад

Check the crank seals and try a heavier oil mixture

@davesplace1307 2 года назад

Has to be the timing. If I remember the carburetor seemed to be heated halfway properly. Only other thing it could be is timing is off by a hair causing it to detonate to early or to late

@2sgblueredblue280 2 года назад

Have you measured the crank to see if it's a long stroker with a normal piston and head

@ethancowlishaw8756 2 года назад

You could have crank issues for sure either it's woren down or its a little to big pushing to the piston up a little to high now I could see maybe doubling up on gaskets could work but it'd be a temporary fix to the problem

@maxtheroofer8004 2 года назад

The crank bearing sounds rough, i would replace it. Some people are saying you are missing thrust washers on crank, a few are saying there are only smaller thrust washers on piston side of con-rod. Double up base gasket may get your piston squish correct

@peterp.6249 2 года назад

Pull out the crank and have it rebuilt. This time with thrust washers. Then, and only then, have it correctly balanced. Eric Gorr is in Wisconsin, why would you spend your money any place else. The PO lied to you about the crank or the washers he installed got turned to metallic paste.

@24BLUEELMO 2 года назад

You also have to check the squish in the head and piston

@broo_shs 2 года назад

i still would chek when piston its top at dots its in same spot,but i've never seen that much play on low rod spot.

@isaiesquivel1759 2 года назад

i have the same thing happening with my 1998 rm80, no it’s not blowing up but the crank has no washers on the side of the crank which i’d never seen before!!

@raym783 2 года назад

I have a garage that’s kind like yours virtually looks the same from what I can see in the videos we add some insulation to the roof and kept in about 30% warmer it was -6 yesterday and it was 34 in our garage

@MikMech 2 года назад

A bungee cord on the little end going up to the frame, lets you crank without the rod hitting anything.

@jmaxim80 2 года назад

the one nut your trying to get off is reverse thread i believe i rebuild a suzuki dr200 motor and ran into the same problem until i tried it to the left that was.

@franlamp3850 2 года назад

You need to double your bass gasket up 👍

@sandmanbub 2 года назад

You really need a dial gauge to check the con rod big end bearings. Had one in the shop that kept shattering the piston skirts. They were hitting the counter weights because the big end bearings were worn. Not enough to be able to tell without a gauge and mount for the gauge.

@baldtireproductions1281 2 года назад

check over the carb im in the same boat as you only thing that makes sense would be hitting off head but id make sure the fuels getting to the motor it could be getting a small amount of fuel enough to run but not stay lubed at 28:1 you should be blowing oil out of exhaust