Seller Scammed Me On This Rare 2-Stroke Dirt Bike (First Ride) 

I M GUESSING IT NEEDS ANOTHER DIFFERENT CYLINDER AND NEW PISTON AND RING.

@@shartne A new cylinder is probably going to be cheaper than re-sleeving this one. But by the time you buy a new piston too, it might be close. Definitely need a new ring. This sort of calculus depends on if you have a quality machine shop nearby that charges reasonable rates. But I agree a fresher cylinder with matching piston and ring is a more straightforward fix than remedying this one's ills. By the time you get to 3mm over you are in sketchy territory.

This guy hones! Time to step up your game, get the bore guage and do the measurements and practices as he described. Win!

Yup I've been saying this all along. He's been putting new pistons in out of round cylinders for years now

Not sure what a snap gage is but checking for roundness and taper of the cylinder bore is standard practice in automotive. If this cylinder was honed oversize by hand its hard to imagine it can be round and free of taper. The other thing Joe does is check ring gap in one location and assume it is the same up and down the cylinder, bad assumption. Still low compression doesn't explain all the symptoms Joe talked about so I am waiting to see final solution. Bottom line if you want to be a good engine builder you need micrometers and the ability to measure accurately at 10,000 th of an inch. Both piston and cylinder need to be checked in multiple locations to find problems and confirm piston size matches the bore size.

he's a great example for young people his age

Seller watching this just laughing

I am shocked at how much patience he has had with motors lol.

@@user-sg5ws7zw5h definitely, me and my room mates started to do this stuff after watching his videos

The youtube revenue helps with that immensely

LISTEN TO THIS GUY!

The unintentional razor's edge is shaving the piston ring. Excellent hypothesis.

That was my first thought. Only thing that could shave down that ring that fast

I thought as long as the port width rule was followed and the rings are pinned then it didnt matter and shouldn't be a problem?

Could not have said it better myself. That was my train of thought as well.

A bore gauge is pretty expensive. You can use just normal Mics, and telescoping gauges to do the same thing. Bore gauges are better for production though, (and probably a tiny bit more accurate if both are used properly), as they are faster, and take less skill to use. Neither are used to check the power valve. But you have 36 likes anyway. That is how sharp the new generation is. You did not have a machine shop in your HS like I did though, (and a life long machinist here because of that HS shop), as they were pulled out of our HS after 1981, when our federal government gave our free enterprise to communism in china. You see how we were ripped off?

The big difference between a telescoping gauge and a bore gauge is telescoping gauges to not give you numbers, so you measure them after you sweep the bore, and measure them with the OD mics. The bore gauge gives you a direct reading, where a telescoping gauge is called a "comparison gauge". That is what may give the bore gauge a bit more accuracy. But if both are used properly, only by about +or- .0001"

Dont come on here rambling on and belittling the younger generation for trying new things and learning to work on their own bikes you weird old man! Get outta here go have a nap. Ffs​@EarthSurferUSA

​@@EarthSurferUSAThe commenter recommends a powervalve check as an additional suggestion, its not linked to the bore gauge measuring/cyl ovality.

​@EarthSurferUSA Still doesn't service manual specify allowable out of round, taper and piston to bore clearance? I don't know of any high schools with an automotive machine shop, not too many community colleges either. I went to Ferris State College in Michigan where they offered a certificate program in Automotive Machine. There were not many places offering anything similar. So if your high school offered that, I am jealous. I agree it is a mistake for schools to not offer shop classes but that is your local school board not federal government. My opinion, we need to get apprentice programs established to teach trades like plumbing, electrical, auto repair, etc. These are good paying jobs, people in short supply. You shouldn't have to go to college to get these skills. Thank you youtube at least diy folks can watch a video.

That’s the same thing I noticed

After seeing him drain that, I immediately was like, "yeah, it's clean fuel with no oil mix."

Ya I thought the same thing it looked like straight gas he may have grabbed the wrong can ?

Is it in ?

Like throwing a hotdog down a hallway

Big is subjective.

Oh, you're a welder?!🤣

@@christopherprisco8690 1/4" 7018 ain't fillin those gaps. lol

I agree u are 100 percent right I just did mine on yz125 2003 I bought steel sprokets on ebay for 34 bucks for both an bought new chain at bike store 74 bucks so

sprocket wont last a month change all or none!!!!

An old chain on a new sprocket is the least of his worries right now pin head .

This dude drains gas from one bike to the next. He’s broke af🤷‍♂️

@@DirtDiggerDanHere whats his worries than no it all

I noticed that also.

Yeah, I thought that fork end was meant for something.

Absolutely correct sir! Once you lock it that sets your base adjustment

i dont know why a person would just assume and throw it together like he did.. was driving me crazy

Doesn't need to he just looks at it and knows if its ok lol pro's measure amateurs guess.

Don’t drink before you comment just saying, it’s never good, if you’re hooked on the the stupid brakes that he actually fixed and you’re being stupid about it then it’s all on You my brain has 29 psi 38:03

Don’t drink before you comment just saying, it’s never good, if you’re hooked on the the stupid brakes that he actually fixed and you’re being stupid about it then it’s all on You my brain has 29 psi

like he cares about what some asshole on the internet thinks

​@danielbrinkman8069 Asshole? I am not. He makes a living from RU-vid. People look to vids like this for education and they should be correct. This guy cuts corners that should be exposed for rookies.

No such thing as a scam when you buy a bike that doesn't run, it's just risky business...

He doesn't check bore size or wear with a micrometer , over 90 thousands ring gap looks like it's either really wore out or maybe .5mm over size be my guess it's the later of the two if it has been bored an the power valve is for a stock cylinder it could be hitting the piston

As much as he does this stuff you would think he'd learn instead of making the same mistakes on stroke cylinders all the time, sometimes he throws a bunch of used eBay parts together an says everything's just perfect bite's him in the ass every once in a while lol

@@lawerncemiller6557look at his inventory. He can’t sell anything he’s touched 🤷‍♂️

​@lawerncemiller6557 Lately, he's had §|-|¡Ť luck. It seems like everything he tries to fix these days goes completely to hell. The tranny in the QuadRacer, the nasty bog on the 1995 CR 250 (still a mystery) nothing seems to be going his way.

He's a shade tree mechanic without the tree, don't expect precision, cleanliness, or proper tools. He is entertaining however and makes em run eventually. For how long, well, that's another story =)

Good for you. I love private business and it is a thrill to build one IMO. But, if this guy is all you learn from,---buy books. I see stuff he does wrong (he cuts corners) in any of his vids. You and this kid are at a disadvantage though. Before we sent our free enterprise to communism in china starting in the early 80's, we had machine shops in our High Schools, and replaced with arts and crafts or gender studies. I learned a lot more after HS in colleges. I hope to bring machining back to a school in our area and teach it, and entice kids to start their own business also, (after they get some experience). The last thing you want to do for your business,--is do shoddy work. It will bite you and may put you out of business, Good work will allow you to grow much better. You can do what this cat does not, and find a shop manual for the bike on line, so you can know what you are doing. Good luck man. I am excited for you. I enjoy the freedom of my own business also. I Port/stroke little 2-stroke engines for a living now, and made more money than I could with 2 engineering degrees and employed by somebody. But I do the best retail work in the world with a great distributor (sends me new stuff to modify, and he sells them all over the world.), and that made me the most popular in the world. I get new customers from a competitor, who does shoddy work, all the time. My customers never go to him. Enjoy your business, and getting great at it. It makes all the difference in the world. Doug in Michigan. PS: What does JOB stand for? "Just Over Broke". :)

Interesting pfp

Stolen comment bot 🤡 Stolen from a kid, no less.

Really? you have your own business? On onlyfans? That's your business? Get lost bot!

Makes sense. Need a chamfer on them to prevent this.

but then he can't make these great videos on how to fix all the things wrong with it, and also make mad youtube revenue

You just described every democrat in history 😂, thank you!

@@machinesnmetal Very true!

@@christopherquarry6234 Yes, I did and you're welcome.....lol

I had one as well, my friends call it the curse

It is a two stroke engine, it has reed valves, but you definitely don't grind them

​@@quakermaasDoesn't this one have an unusual valve system instead of reed valves, & that is a reason, that this bike is special?

I believe he was talking about the power valve being to close to the piston if the cylinder has been bored over

@@andyjidas you have understand me very well,i do the same on my 2 stroque sea doo engine few year ago

You can definitely run into problems with this combination. We used a Sunnen portable hone on so many KT100s I can't count. While it is true it will produce a round bore, the size of that bore eventually is not constant over the length of the cylinder. Lower in the cylinder where there are ports the hone will remove more material and the cylinder is no longer straight. It's a lot easier to see this with a dial-bore gage, consistency over enough measurements to reveal it is always a challenge with a snap gage. We had motors on 52.10-52.15 mm pistons with .003-.0035" clearance above the exhaust port exhibit ring seal problems that we sent to Mark Dismore at CKS to bore them to restore straightness. They had to go out to 52.40-52.50 mm to get them straight top to bottom, essentially ending their stock-class lives as the biggest Yamaha piston was 52.35 and the Wiseco and Burris pistons (which were made in larger sizes) were junk. Stand-up Sunnen honing machines were better in this regard as the stones are longer and you have better control moving the cylinder rather than the hone, but you still need to bore as much as possible and hone just enough to finish and crosshatch the bore properly to maximize compression and power. Nothing ran as well as a new cylinder at their original 51.97, .98 or .99 mm sizes as they were the straightest. We built open KT100s with 55+ mm bores, which you definitely wanted done with a boring bar. That's how I know what happens at 3mm over - the port area, timing and angles all changed just from the boring operation. Of course these were then fully ported for this application, but they changed quite a bit just from the bore. We also built multitudes of Briggs and Strattons, along with controlled stock and Unlimited reed and rotary valve Komet, Parilla, KTM, DAP, Atomic and Atlas engines. Of all these the KT100 was the most efficient and cost-effective, and to my mind one of the best engine designs of all time - debuting in 1972 and still in use to this day. We still have the Sunnen portable hone - along with a basement full of trophies and plaques from tracks and series all across the nation.

Great answer. Sounds like you have deep experience - I'm assuming you are in the Midwest with the Dismore CKS comment. I ran in CA and had good relationships with PKS and HRE. I ran at the same tracks at the same time as Scott Pruett, Ronnie Emmick, the Hartmans and the Arakis in both sprint karts and Road Race karts. If the IKF had left well enough alone and not allowed the Italian PP engines in, I would have raced far longer.

@@rcodepaul I raced with thousands of people, but Ron Emmick was the best. I still remember his absolutely dominant runs at the '85 IKF Grandnationals at Adams Raceway in Riverside. He won at least 2 classes that weekend with the then-new Elite chassis, DAP power, Goodyear tires and a precision I never saw before or since. We started in the southeast running 4-cycles on dirt in the early '80s, moved to the Phoenix AZ area, then SoCal, and eventually back east. We ran club and local dirt and roadcourse stuff, the IKF Region 7 series, and the WKA B&S Dirt National series for years, along with any money races we could find. We built engines for ourselves and always for a large number of other racers to fund our efforts. Our Yamahas were good enough that we ran them successfully against the Italian PP stuff. I was a pretty big guy back then and used to overcoming power/weight ratio disadvantage. I just had to slim down some and get closer to the weight limit to continue winning once the DAP, TKM and Komet PP products debuted. We also ran open-modified Briggs and a lot of controlled-stock stuff, with first Komet K55s and K78's, and later DAP TA80R, TT-75 Parilla, and the awesome Atomic PCR93 reed. We later had absolutely incredible Unlimited rotary valve engines - a trick Komet K299 B-bomb with a K30 cylinder Dismore helped us build and a KTM 135. The B-bomb was just amazing - its 50+ horsepower made the 365lb kart and driver package as fast as a sprint car and a real challenge to hook up on dirt. I retired after 20 seasons and am at this point an old man - but will never forget the crucible that is racing and the glory I enjoyed on my best days, beating all comers on national stages. Nothing teaches confidence like racing, and I would have become much less without that and its myriad of other lessons.

@@user-ln7mk3yl4n Totally agree on Ronnie Emmick. I don't know what happened when he went to Europe to race - maybe that's when his dad fell ill? I don't know but I think he had the gift and could have been our Max Verstappen. Dreams dashed for sure. My brother just sent me a video of Ronnie driving a dual kart at Bakersfield, so I'm glad he's still kicking. I'm assuming he is participating in the vintage kart stuff. Your quote that you "will never forget the crucible that is racing and the glory I enjoyed on my best days". That really sums it up. We designed our own roadracing chassis and it was fast. It was a mashup of a Hartman and an Emmick. It had Emmick RR spindles but an enclosed axle like a Hartman. We put a very narrow porch on it for aero, made the whole kart as narrow as the rules allowed, pushed the driver forward for almost completely neutral handling. I won the 1985 Winternationals at Willow Springs in the PVAL class by a huge margin, lapped half the field. Then threw on weight and nearly won Expert against Tommy Nields, Kel McIntee and others. I placed 4th with a broken slippy pipe cable. Coulda woulda double win in one day. I ran in NorCal and SoCal including Infineon/Sears Point, Laguna Seca, Riverside (before it closed) Willow Springs. Then I broke everything I owned at the 85 Grandnationals, then the rule change and I left the sport. I'm long separated, but still miss it all the time.

He revs the nuts off every cold start up, can't seem to help himself.

@@al4904 😆

Notch is there to make an adjustment usually you put a 3mm drill bit through the notch and into the cylinder thats sets the base point then you take the slack out

Thanks for info​@@elodmihaly6665

Burst out laughing when I read this comment!

Sorta..Yes, he got burned by the liar of a seller but he made 3 really good videos of Joe putting this thing back together....more than pays for the trouble..Magic of YT..great videos.