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YZ250 Top End

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Rebuilding the top end on a YZ250 2 stroke!
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Опубликовано:

26 авг 2024

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Комментарии : 87

@nastysoda9212 8 дней назад

first time anyone ever said why to check the ring gap, thanks! learned something new. Never really thought about what would happen if the gap was too small. Seriously thank you for this video, simple things like showing how to pry the ring clip in helps so much.

@highlandcycles 8 дней назад

Glad to help!

@mcanderson0 8 месяцев назад

Yes viewers, we should DEFINITELY use a torque wrench as often as possible to avoid warpage, excessive wear, cracking, and other destructive occurrences that are ever-present and always possible, ESPECIALLY with magnesium and aluminum frames/blocks/brackets that make our modern toys so lightweight and awesome. "Crow Foot Wrenches" that mount to your torque wrench's square drive shank are awesome for those hard to reach areas and are super cheap at Harbor Freight or Princess Auto or whichever chinesium discount tool warehouse you have in your local hood. Good vid man, thanks for taking the time to whip up a how-to.

@tyleradams6002 8 месяцев назад

Just did my first ever top end job on my 21 yz250, this is the first 2 stroke iv ever had and after a year of learning to deal with that crazy torque and power like a light switch. I see why everyone loves 2 strokes...made me learn to ride more flowy and use my clutch at all times..no lazy riding like I did with my previous crf250r's that iv had. Also added a apex head with the sx dome. Was able to drop a jet size and damn it's a different animal

@highlandcycles 8 месяцев назад

Awesome! YZ’s are the best

@Ward1228 3 года назад

I just did a top end on a new to me 01 cr250 after discovering the piston had a crack while changing the reeds. After watching basically every video you have put out I decided hell I can do this. I didn’t have a ball hone so I just used a little scotch brite to knock off that glaze and the cross hatch was still present. Needless to say a 2 stroke is WAY more easy then my old kx450f. I learned real quick why 2 strokes are better after rebuilding that thing. Keep up the great vids and sound effects 😂

@highlandcycles 3 года назад

Thanks so much. Glad you tackled that job.

@peteregger7928 3 года назад

Noticed the Scottish flag in the background! I was born and raised here in the U.S. but my Mother is from Glasgow, Scotland. With her heavy Scottish accent I would always have to act as a translator when my buddies came over to the house. Lol! The Romans built Hadrian's Wall to try and protect themselves from the Scottish Highlanders. The Romans made some inroads initially but weren't able to keep the territory or conquer the Highlanders! The Highlanders were one of the few groups of people the Romans were afraid of!

@highlandcycles 3 года назад

YES! Both my mom and dads families have very Scottish roots.

@jzsquad6866 Год назад

Hey man great video when you said 7th that’s the measurements you like for the ring in the cylinder

@highlandcycles Год назад

7 thousandths

@jzsquad6866 Год назад

@@highlandcycles thank you I’m doing a rebuild soon on a yz250 I got on a trade and your video was a huge help I’m confident enough to do it now thanks to you since you did it with no fancy tools.

@michaelwebster2416 3 года назад

another good video , i learn somthing every time , great stuff!

@highlandcycles 3 года назад

Awesome! Thanks so much for watching

@ericraherimanjato9688 2 года назад

Excellent video!

@highlandcycles 2 года назад

Thanks a ton.

@11MrRichi 3 года назад

Super cool love ❤️ this keep it up 👍🏼 love it

@highlandcycles 3 года назад

Thanks. Will do

@11MrRichi 3 года назад

I’m in to the desert with my kids and did a rebuild on some kx 65s with out knowing nothing and u make it seem so simple ur fan for sure 💯 %

@BikerBenny Год назад

20:15 ive come acrossed alot of videos talking about different base gaskets thicknesses used for compression but dont known whats behind it all?

@highlandcycles Год назад

The thinner the base gasket, the higher the compression

@Meekerextreme 3 года назад

The more I watch you with this YZ the more I'm thinking of getting one, much easier to work on then the GasGas. So only question I have what headlight can you run with the 80 watt stator you got with this bike. Lights are very important.

@highlandcycles 3 года назад

You can run the biggest one that baja designs makes I think. XL Pro

@IsaacGonzalez-et2bq 3 дня назад

great video...is it required to rehone the cylinder every time when changing out the piston.... I don't see any crosshatches in mine although it's relatively smooth and seems to be in relatively good shape like yours was....

@highlandcycles 3 дня назад

I like to.

@IsaacGonzalez-et2bq 3 дня назад

@@highlandcycles copy that...ordered up the correct size one for my bore and some honing oil, as I don't have mineral spirits. I'm a little bit scared to take apart powervalve since many sources say to wash in hot water after with a brush, but noticed you did it without taking it apart...anyways good stuff and thank you, this is my first time doing it!

@Shooter_Mcgavin93 3 года назад

Lmfao that Henson sticker I did the same shit for jokes before it burned off 😂

@highlandcycles 3 года назад

Hahah

@colton_vesik9973 3 года назад

Did you do the power valve mod as in taking out 1 spacer on the governor so it opens sooner

@highlandcycles 3 года назад

No. I like how it works. This is a YZ, not an X

@tomcross2956 6 месяцев назад

Should I take apart the power valve before honing? Also stock bore size ok using a weisco piston 66.4?

@highlandcycles 6 месяцев назад

Yes on power valve and I use the vertex b piston

@tomcross2956 6 месяцев назад

How did you clean cylinder after honing it?

@highlandcycles 6 месяцев назад

Brake cleaner

@benjaminsanabria5212 6 месяцев назад

How often should I replace a top end on a brand new yz 250 how many hours thanks

@highlandcycles 6 месяцев назад

Depends on how you ride. If lots of top end wide open then 50-60hrs. If more low to mid, I’d do 70-80

@Dezert-adventures 2 месяца назад

No rk-tec head?

@highlandcycles 2 месяца назад

Not on this one. This is an old video

@benjaminsanabria5212 3 года назад

What did you use to clean the head thanks greatly appreciate

@highlandcycles 3 года назад

Brake cleaner

@grantallen5274 Год назад

I have a serious run away issue after a top end bike was running fine any quick tips please mate

@highlandcycles Год назад

Sounds like an air leak or carb slide stuck

@user-ww7fv1nw4x 10 месяцев назад

A quick question piston at BDC do you think the ports should be fully exposed be nice to see a pic of that when you did the top end. I noticed mine are not and the squish clearance is over 1.5mm so it seems to me the cylinder needs to be raised and the head brought down to a 1mm squish what are your thoughts thanks.

@highlandcycles 10 месяцев назад

It sounds like it would be optimal to do that but I can say that the bike will probably have better low end the way it is and better over rev if you were to raise the cylinder.

@benjaminsanabria5212 3 года назад

So go with a B piston is the bes bet for a stock yz250?

@highlandcycles 3 года назад

Yes

@thefourwheelerdoctor7808 2 года назад

Hello what brand of homing ball do you use? As shown in the video. Thanks in advance

@highlandcycles 2 года назад

I don’t know the brand but I got it from Snapon

@RideWithTheWolf 2 года назад

My yz250 makes a low end growl and knocking noise at low idle. I've read that it can be a normal noise for these bikes? I've watched a lot of YT videos and the yzs all have that kinda tapping noise, for the most part. If it was a bearing wouldn't I know it? Bike runs good.

@highlandcycles 2 года назад

They are noisy motors. I wouldn't worry unless it gets worse

@marioguzman9290 Год назад

Hey bro! Did you measure the cilinder diameter? Also what state do you live in? Greetings from Las Vegas Nevada!!!

@highlandcycles Год назад

We are in CO.

@trentonrobinson2745 3 года назад

What kind of hone did you use aluminum oxide of silicon carbide and what grit

@highlandcycles 3 года назад

I don’t know the grit. They are from Snapon many years ago. They just deglaze and put a crosshatch back in. They will also expose anything that is coming apart too. I have had a few where after I run the hone, I find some part of the plating coming off or an imperfection. That way I catch it before I put it back together.

@mushmanist 3 года назад

I’m looking for a power valves for a cr125 02 to 03

@highlandcycles 3 года назад

Dang. I don’t have that

@TheYAMAMAHA Год назад

Link to the hone you used please?

@highlandcycles Год назад

SnapOn

@TheYAMAMAHA Год назад

@Highland Cycles okay, was curious because I just mine with a flex hone and used the brands honing oil. Did it for about 5-7 seconds at 500-600 rpm and turned out beautiful.

@highlandcycles Год назад

@@TheYAMAMAHA perfect

@user-dd4ng6uv9w 8 месяцев назад

What topend kit do i get for a 1994 yz250

@highlandcycles 8 месяцев назад

I like Vertex

@user-dd4ng6uv9w 8 месяцев назад

U where saying there wasn't really a difference in the vertex piston size, u said A.B.C are slightly bigger what should I go with for the 94?

@benjaminsanabria5212 3 года назад

What size hone do you use for a yo 250 stock cylinder

@highlandcycles 3 года назад

I don’t know the actual size. I’ll try to remember to measure it tomorrow

@hoangsolo3314 3 года назад

What’s size of the piston 66.35mm? I want to order for my 2004 yz 250 too.

@highlandcycles 3 года назад

I don’t remember what size. I normally use the equivalent of a B piston.

@justinpeterson8754 2 года назад

I just put a new top end on my YZ250. I also replaced the head with an RKTech high compression head. I checked the crank bearing according to the manual. Everything checks out. It sounds like there’s a rattle coming from the bottom end. Is it possible that the crank bearings in the cases are bad? Is there a way to tell without disassembling the engine? I also have video I could send to you. Thanks for the help?

@highlandcycles 2 года назад

That sucks. You can take the side covers off and try to move the ends of the crank up and down.

@justinpeterson8754 2 года назад

@@highlandcycles thanks for the advice. Do those bearings commonly fail?

@highlandcycles 2 года назад

@@justinpeterson8754 Not super common but it happens.

@GravyReactions 3 года назад

Hey! I have a question. Is it ok to be able to use steel washers on the top end? Or do I need the copper ones.

@highlandcycles 3 года назад

You should use the copper ones if you can. But in a pinch you can use steel ones.

@michaelhahn1278 3 года назад

how much would it be if you did a top end on my xr400r?

@highlandcycles 3 года назад

Depending on what needs to be done to the cylinder, between 600-800

@vince5946 3 года назад

I am looking for a winter project and thinking of doing a YZ250 woods bike build. Any recommendation for a model year? Looking at parts availability it seems that the 2006 year would be the best to start with?

@highlandcycles 3 года назад

Anything 2006 and up

@travisk5589 3 года назад

Wait? So is it a Yamaha crank or hot rods? You just explained that yamaha makes there cranks super tight and need to heat them up but then say its a hot rods.

@highlandcycles 3 года назад

Yeah, sorry that wasn’t clear. Yamaha oem does that and hot rods does it on yamaha cranks. It’s actually on most cranks really. It seems that KTM ones aren’t normally blue like that.

@travisk5589 3 года назад

@@highlandcycles Thanks for the reply. I am getting ready to rebuild a 2008 yz250. It's still on the original piston, rings, and crank. Is never been spilt. I am wanting to throw in a 250x 4th and 5th and figure i better rebuild the motor while i am at. Do you like hotrods, wiseco, vertex, etc better than OEM? I would like to get another 12 years out of the motor.

@highlandcycles 3 года назад

@@travisk5589 I like hot rods cranks and vertex pistons. You can get that set up in the Wrench Rabbit kit

@GL-zo3vz 2 года назад

30 seconds honing?

@highlandcycles 2 года назад

It is just to deglaze the cylinder and put a crosshatch back in it.

@GL-zo3vz 2 года назад

@@highlandcycles nice.

@simtak6620 3 года назад

Hi great video men like always , I have my 2019 yz250x 2 stroke and my question is , Do you run jd jetting on your yz ? , beacause I will try jd and run motorex 50:1 for trail riding. What your opinion on that ? Thanks

@highlandcycles 3 года назад

Thanks. My YZ actually has a Lectron but I do recommend JD specs in the stock carb. And 50:1 is grear

@simtak6620 3 года назад

@@highlandcycles yeahh thanks men !