How to change piston / top end rebuild 2002-2007 Honda Cr 250 

Probably the most watchable how to video I've ever seen, no unnecessary dialogue or time-wasting. Straight to the point and easy to watch

Great video. As a mechanic, one thing I feel I should mention is the importance of replacing the crankshaft seals. They only last for so long, and when they start to leak, they suck air, leaning out the fuel air mixture. This can result in poor idle quality, and more importantly it can cause piston failure. So if you're replacing a piston because it failed, it's essential that the seals be changed too. It's something a lot of people overlook.

VERY relaxing top end build video. Music is great as well. Thank you so much

Very nice. Very smooth. Very calming. I feel refreshed just like that top end.

The best top end rebuild video I have found yet.

Your bike has got a very beautiful sound

Perfect. This is the perfect sample for piston replacing in our honda

Great video, just one tip: When installing the circlips, install them with the gap pointing straight up or straight down. This prevents the clip from being squeezed at high RPM and falling out. Other than that, great job, you've got a sweet CR

U make this look EASY!!! Me and my cousin have struggled for HOURS on our 50cc mopeds trying to change pistons and sylinders to 47mm instead of 41mm...

Nice video, and great editing :) Keep it up!

Wow - Thanks for saving anyone who watched this video over $500 each for such a precision work of art.

really well made video, you helped a lot of ppl. Good job dude! Let ypur bike warm up properly, and you dont need to worry about revving it. touch the cylinder from outside, if its about as hot at you can handle for 5sec's, your good to go full throttle after a couple of good accelerations. And that r2/tts is great oil for 2-strokes.

Beautiful video, thank you for that!

Good stuff ! looking into buying a CR250. Considering just doing a full top and bottom end build to start off fresh but hate going into the transmission and what not.

Wicked bro hell yeah dope vid!

I don't even own a 2 stroke but this is still a cool video to watch now I know how to if i ever get one

This helped me get $50 haha thanks it was a great help

I don't have a bike yet but enjoyed watching this nice.

Great video, thanks for posting

another good rebuild video! ill favorite this one too lol

Greetings from Las Vegas Nevada USA!!!

Great video! Very professional and well done..... Don't forget about ring gap....

as always a very nice job!

great job man!!! very nice"""

excellente vidéo !!!.....

I do thank you. I have a 1985 cr125 I'm doing the top end myself for the first time. The other videos show like we are already mechanics and skip a lot of little things they don't find necessary to show. But I'm not a mechanic so where you went over piece by piece it helps me out a lot. Example...the copper washers in the front. Little things make a difference. I got my parts yesterday from Honda at closing. I didn't look at them until today. They're closed on Sundays so it will be Monday, they forgot the wrist bearing. I think that's what it's called. The bearing for the connecting rod and piston.

Excellent cinematography

Awesome video.

excellent video. thanks !

vídeo muito bom !! Parabéns (congratulation!)

Great video!!! Please make more

Finally a video worth my time

way cool, I injoyed that a lot. I love all cr 250s

Thanks mate. Gonna do mine now. Cheers

Great video helped me rebuild my 2000 YZ 80!!!

jangho9 great video man really helped me out understand the whole process of rebuilding my 2003 cr250. I was just wondering did you drill holes for the exhaust bridge because I read you have to drill those 2 little holes with wiseco pistons and I was a little discourage because I wasn't sure how to do that

great video .. I just did this today .. but noticed .. I gotta do the bottom .. do you have a bottom end video like this one .. this video was very helpful ..thanks

awesome video

Thanks for this! It helps alot!

Exelent video...2T forever.

excelent video

What are the songs used in this video? Great videography btw!

Very nice video, thank you!

Thanks for the video. You forgot to: drill the lubrication holes in the piston, set ring gap, and deglaze the cylinder.

Thanks for the video. I'll need this for my 2002

Nice job👍

That's a dam clean bike!

Great video. Wish I could find one on rebuilding a 2000 KX250- especially one this thorough.

Thanks for sharing!

something beauty

Dream bike !

bel video chiarissimo.

great video man you gave quite a few good tips but first timers should know to break in the piston very gently like idle warm-ups 3 times than gentle rides for 2 times and rip her to pieces on the track! keep the good work comming man!

very nice video

great vid thanks

perfecto el video tio

good job can you tell me if you feel the wiseco piston feels any diffsrent than the standard one i.e Does it rev quicker etc cheers

THE HEART OF A 2 STROKE IS THE AIR FILTER.

Thank you for the video. I'm doing a top end on a '86 Trx250R which is nearly identical. My Wiseco kit should arrive in a couple days. I'll watch this video again before installation.

ottimo video complimenti

i love how simplistic 2 Strokes are! anyone with some tools could fix there motorcyle up over a day

great video! brief and to the point yet simple. i feel like i can do this now. too bad ill be trying it on a Beta trials bike and not a Honda CR >__

I love it!

Been thinking about doing the top end on my KDX. Had people telling me the cylinder HAS to be resurfaced yet I've seen no mention of that in a few rebuild videos I've watched. Of course it would be good to do, but is it required? My KDX runs mint as is, if that changes the answer at all

Buena maquina 👍

As long as the clip is away from the hole on the side its fine. Nice vid you didn't do anything wrong man

proper ping.. very nice

I could not find any vids on how change piston on my kx125 so i watched thos and went and replaced piston cause it needed rebuild (btw i used wisco) and it was preaty much same alosmost but it turned out great and i dont feal like im riding 65 any more lol

勉強になりました！！！

please more videos like this....you help me a lot😀👍

Yes it is. The only thing you have to pay attention is to the power valve actuation system because when mounting the cylinder it can be in the wrong place.

Best rebuild video online now if you could do kx100

Thanks alot!

Sweet

What should the ring gap be set too tho? I will be running a wiseco piston and its dual ring...

I did my 1st one when I was about 12 , an I had to rebuild the front forks because the were bent backwards after someone crashed it into back of a car, I did it from reading a manual book back before internet could show you ,

Thanks!

Nice work ;) dud could i know the name of the tracks pls ? :D

Nice video, and sweet bike. Super clean. I don't remove my powervalve arm, just the cables. Any idea on why the cylinder on the '05-'07 got an update in the powervalve area? Just to make it easier to service? I'm pretty sure I saw Mikuni but that carb bowl makes it look like a Keihin carb. Is it? I've seen some CR's with Keihins and that's what they look like.

Oh my god...That was actually theraputic.....nice

Do you have to glaze or hone a cylinder every time you rebuild ?

Awesome video! Two stroke are such much simpler than 4 strokes one question why do they have the copper washers in the front only?

Name of the first song? Ive been looking a long time for it~~

Now i can try my own rebuild.

Depends on your definition of similar, over all yes but there might be some model specific changes. The overall process is the same on any 2 stroke.

How do you now when an oversize piston is needed? Did you have to use a micrometer to check that 1st?

Nice video, I've seen it over and over again, and every time I ask me... wich is the name of the last song? Thanks for sharing.

Would this be the same as my 1989 honda cub 90? I cannot find the bit with RC wrote on it?

i got a yz 80 1986 and cant find any whole engine rebuild parts or nothing?

Thx

3333. bad ass vid!!!

what does that coating on the skirt do? piston. i have a place near me that does that.

At 2:55 what is the gasket underneath the jug called? Need to buy one and the one that came off with the power valve cover? Thanks!

i like that bike, you should hone the cylinder too, unless it still has the crosshatch and it is in decent condition then dont worry because in a single hone you put like 50 hours of wear on the cylinder because it takes off a real little metal

how to adjust rc valve? thanks

I definitely wouldn't think so. '02-'07 are case reed engines. In '02 they completely redesigned the engine, along with the frame and maybe a few more things, like a RC actuated power valve. A top end change isn't very hard to do though so you'll figure it out. Major peice of advice: GET A SHOP MANUAL. It tells you how to do almost everything, including torque values which are pretty important when your assembling an engine. PM me if you have questions, I should be able to help. Good luck!

Hello, I'm planning to make top end rebuild on my bike. My manual write that the thin of base gasket is really important to the compression ratio. It says that I have to measure the gap and choose the fitting gasket. I think you used top end rebuild gasket kit. Shouldn't I care the manual? Do I use the kit with calm?

any issues with the piston after running for a while?

I would make sure to clean the head bolts. Any little bit of debris that gets caught between the head gasket and both mating surfaces is a definite way to create a leak. Happened to me on my first rebuild when I set my cylinder head down, scraping some of the corrosion of the bolt onto the head gasket. Unfortunately I had to go back in there and replace the head gasket and make sure no debris was left over.

i love 2 stroke