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

[@mizer0085]

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

[@terracethornhill]

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.

[@jangho9]

+Terrace Thornhill Thanks bud. Good words there!

[@9drewbreez]

+Terrace Thornhill What exactly is a crankshaft seal, i am new to 2 strokes

[@steveringer7143]

+Avenger 21 The seals that seals the crank case from outside air. There is one behind the flywheel and one inside the clutch case on the crankshaft. The 2 stroke crankcase is where the air/fuel enters the engine. That's how the crankshaft is lubricated, with the fuel/oil mix.

[@9drewbreez]

Steve Ringer could you send me a link for a 02 cr250 I'm thinking about rebuilding it

[@steveringer7143]

Avenger 21 Type in the word GOOGLE.

[@JasonTate86]

The best top end rebuild video I have found yet.

[@flex1040]

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...

[@pauldenham2952]

I can do it in 20 mins, thats the work period at the end of a day for a six day enduro, or both tyres and top end in 45 mins with moose tubes.

[@BoughtNotBuilt]

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

[@javandell8020]

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

[@kennethhunt248]

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.

[@jangho9]

Thank you so much Kenneth! Im glad you like the video :=) Wrist bearing is right, hope you get it fast!

[@ther1rida]

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

[@jangho9]

Thank you! :)

[@juanpablomartinez5596]

@@jangho9 Plis , awhats ? tork cilinder???? Gracias

[@jangho9]

@@juanpablomartinez5596 Hello! Torq on the cylinder is: 39 newton & 29 lbf-ft.

[@rageagainstthetoymachine2410]

with the help of this video I was able to do a top end refresh on my 2000 CR125 for the very first time ever...never again will I let the Honda shop charge me $200 for a 15 minute job. thank you dude! I truly appreciate you taking the time to make this tutorial!

[@zachsylvestermotocross48]

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!

[@JimmyLLL]

That should say, warm her up and go fairly hard straight from the get go.

[@TexasLeverGunner]

Wrong... wrong wrong wrong.

[@motoXkiddvlogs]

Fuck that. I got 100 hours on mine. Break in doesn't matter warm it up before every ride and it will be fine no matter what you do

[@painmagnet1]

+motoXkidd vlogs Hard break-in is correct. Heat cycles are a stupid fantasy.

[@TS50ER]

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

[@eugeniomartinmartin7404]

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

[@Shadow93Shadow]

Your bike has got a very beautiful sound

[@jangho9]

Arkalyos | GaminG | Thanks!

[@blakey271able]

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

[@husqrok]

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.

[@wyrickblake80]

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

[@TheMikek33]

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

[@jangho9]

at 5:58 you can see the lubrication holes. I always drill lubrication holes :) Thanks

[@ghostmorrill]

Can you tell me more? I'm in the process of rebuilding my son's 2002 CR250R. Will I need to?

[@dylanmerriner2702]

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

[@bamagolds]

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.

[@jangho9]

+Chad Adams No problem man, thanks! Yep thats almost identical. And you do not have to worry about that exhaust valve either :)

[@bamagolds]

Thanks for the response. It all arrive today. I'm using the Engine Ice coolant, if that makes any difference.

[@jangho9]

+Chad Adams That doesnt make any difference :) Good luck bro!

[@bamagolds]

What signs did you notice that lead to your rebuild? I ask because I have a stock bore. My compression went from 125 to 140 psi. My manual says 170 psi +/- 15. It still doesn't run right and I've done every adjustment I can think of. Think I should bore?

[@chasemitchell2816]

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

[@Frogswilly]

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

[@jangho9]

+Chris Nicole Yes i agree :) Thats why i ride them. Easy to work on, cheap to fix, very reliable and LOADS of fun. I grew up riding 4 stroke bikes and quads but riding a 2 stroke is so much more fun.

[@marioguzman9290]

Greetings from Las Vegas Nevada USA!!!

[@StoneStraiff]

Finally a video worth my time

[@jangho9]

Good to hear bud :=)

[@kevinstearns4198]

THE HEART OF A 2 STROKE IS THE AIR FILTER.

[@SuperJAWman]

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!

[@TheKelzer]

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

[@masonseubert5428]

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

[@jangho9]

Thank you. Im glad it helped you :)

[@NotEpic]

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

[@kingkong81icloud]

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 ,

[@nationalforestriders]

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

[@EdgarLuisCosta]

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.

[@CZW10000]

Excellent cinematography

[@AaronGoneWild]

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

[@jangho9]

two strokes work the same, doesnot matter if its a honda or a kawasaki :) Im glad it worked out for you!

[@mikeinsanediego]

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

[@CarsnStuff]

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.

[@claytization]

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

[@nathanmcfall9957]

Look how easy it is compared to a 4stroke

[@heidihorsman8242]

Nathan Mcfall like buttering bread ive done a ton of em. bottom ends to.

[@eddies2kturbo]

That's why I'm getting a two stroke man don't get a four its to much lol

[@MrFreeze79]

Nathan Mcfall ya but how often do you have to rebuild a 4 stroke? been riding for 6 years but brand new to dirt bikes, it just seems like these 2 strokes have to be babied all the time, so many engine rebuilds!! it just seems a little crazy.. why do these dirt bikes require so much maintenance compared to road bikes where you just change the oil every 4-5000 kms ? by the way, do you have to replace the piston as well as the ring?

[@kevinstearns4198]

+Nathan Mcfall fukin hey rite!!!!!!!!!!!!!!

[@javandell8020]

+Nathan Mcfall I find my KTM 500 4stroke to be much easier to work on than taking an engine apart. One mistake and this bike will become useless.

[@collierad3]

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

[@punkkerboyzz]

it's pretty much the same thing on any 2-stroke

[@petarlucic2012]

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

[@jangho9]

Thank you :) Yes im actually working on a new video right now!

[@petarlucic2012]

Frez Productions I am waiting for that 😃😃

[@brassrides7234]

Beautiful video, thank you for that!

[@warriordriver350]

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

[@mcbecane6249]

Makes me want to buy myself a 250 and make top and rebuild for fun

[@jangho9]

Thats fun! Buying a Cr250 now a days is not a bad idea because they only go up in value :=)

[@mcbecane6249]

This friday im going to buy one 😅😂

[@jangho9]

@@mcbecane6249 Nice!! What year ?

[@mcbecane6249]

@@jangho9 2004 with 2016 fender kit brand new rebuild of the engine and the aftermarket suspension with bigger brakes and lots of goodies Im more the "built not bought" type of guy, but for the price, it was worth it and I sure going to give it some of my personnal taste onto it like my older crf250r 2016 i blew 2 yrs ago by powerdercoating the frame black and putting a 4 stroke dual exhaust on it dm me if you want to see it !

[@bamper42069]

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.

[@thegoldenman54]

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

[@Dubtecate]

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

[@jangho9]

Thanks! Im glad to help.

[@thegoldenman54]

another good rebuild video! ill favorite this one too lol

[@jamesbb91]

Thanks for this! It helps alot!

[@jangho9]

jamesbb91 You are welcome :)

[@jchavins]

Nice video but I had one of these and you don't have to pull the head. The piston slips part way into the cyclinder on assembly and the whole assembly drops down over the rod and you push the pin into place and put in the snap ring in. Much easier to do...it's a bunch easier ....can't do it this way on 2005 and later YZ250's though, not enough room. Same procedure for the 4 strokes...

[@billyramus2444]

That's a dam clean bike!

[@TheTrapjaw]

Exelent video...2T forever.

[@stephendavis7707]

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

[@Vini-rm2ss]

excellente vidéo !!!.....

[@MxRider721]

You missed on providing a lot of helpful info for a first time rebuilder... like tightening your cylinder head nuts in a star pattern.

[@MxRider721]

Other than that, excellent video.

[@MxRider721]

Ill have to re watch the video when I'm off work, ill get back to you

[@MxRider721]

dirt Junky He didn't crosshatch the cylinder... Though that isn't guaranteed to cause a seizure.

[@jimdettman661]

Also missed end gaping the rings, another sure fire way to end up with a problem.

[@MxRider721]

They will almost never need to be gapped from wiseco. Good to check but I doubt it would cause any problems on startup.

[@pepitajonson7066]

perfecto el video tio

[@jakeshuster8392]

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

[@DnosSFS]

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

[@electraexplorer]

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.

[@jangho9]

Thanks man! I dont remember the song,sorry. Its some royalty free music.

[@canton7180]

Does this require no prep of the cylinder, I would guess a quick hone with a bottle brush and oil? YES or NO?

[@Mr.Bearded.Mechanic]

Hey man, nice vid, but you put that piston pin clip on the wrong position. The clip cut must be at 12 or 6 o'clock, otherwise cuz the acceleration and the inertia it can be pop out. Have a good ride! :)

[@Andres_Cardoni]

excelent video

[@Mukeshmiktecrep]

Two strokes are easiest to work with.

[@Mukeshmiktecrep]

Luca Felix Yeah, simple is better, simple machine are less prone to malfunctioning.

[@mick3422]

Nice video mate! Any idea what the torque specs would be for 2000 honda cr125

[@jangho9]

Thanks! Torque specs on the head and cylinder?

[@mick3422]

@@jangho9 Yes plz mate

[@jangho9]

@@mick3422 27 newton meters (N.M) on the head nuts and cylinder nuts :=)

[@mick3422]

@@jangho9 Thanks

[@SuperJAWman]

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.

[@RBAERO]

Great video!!! Please make more

[@AnotherGuyWithaSlow2V]

Wonder why my bike didn't start on the first kick? It was around 65 degrees out and I gave it 3 priming turns and put it TDC and kicked and nothing. It finally started on the 5th kick. It was not on choke. So I'm guessing that's what it was.

[@johndasilva66]

Aren't you suppose to measure the ring end gap before installing the rings? Or are they made to fit your specs out the box?

[@GabrielHairStudio]

how to adjust rc valve? thanks

[@aleksas53]

as always a very nice job!

[@davekana8388]

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

[@justin117ortiz]

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

[@willelmendorf5383]

Do u have to hone the cylinder each time you rebuild a 2t

[@jeepkiller42]

No

[@CorralesRacing]

Buena maquina 👍

[@Pmarolla]

vídeo muito bom !! Parabéns (congratulation!)

[@davise8852]

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?

[@Quadguy83]

Didn't test ring end gap, no oil holes drilled in piston. Gonna be doing it again very soon.

[@riagantrease5175]

Thanks mate. Gonna do mine now. Cheers

[@xrsk8]

Una pregunta muy importante por que no le pones pegamento a las juntas?

[@mazafuzle]

quik question..dont know much about bikes.. but i know cars have 3 rings, 2 for compression and 1 for oil control,,, why does this piston have only 1? does 1 ring do both jobs? do all motorbikes have only 1 ring per piston?

[@SCB666]

How similar is this to a CRM250 rebuild wise?

[@LokDog808]

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 >__

[@jangho9]

You`ll be fine! Its the same procedure for all 2 stroke engines :) Give it a go and im sure it will work fine.

[@accipiternisus649]

when we talk about honda,whats better 2 stroke or 4 ?

[@khaled6100]

if my engine got inside scratches from the old bad piston , what the size of the new piston should i buy ? Honda cr250 1991

[@100GTAGUY]

You can use standard pistons, just make sure you get every scuff out of the cylinder or the melted aluminum will melt onto your piston again and mess your day up. You can run over size if you'd like, but it's up to you.

[@riotmaxxx1984]

i miss to hear a 2 stroke sound on an early sunny morning...

[@alteredtimephotography8724]

Wicked bro hell yeah dope vid!

[@heidihorsman8242]

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

[@SoundsEssential]

something beauty

[@sebbelarsen5556]

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!

[@cadwarrior]

is there a special break in procedure after piston change? Someone told me to start the engine, let it run at idle for 5 min., than let it cool down for 2 hours, than repeat this step another time.... any advice would be welcome!

[@jangho9]

When you ask that question, you are going to get many different answers. I have heard about the break in method you mention here but i dont use it. I let the bike idle then i go out for a easy ride, not pushing the engine. After this ride i let her rip, lol. Thats how i do it on my 2-strokes.

[@cadwarrior]

Frez Productions thanks!

[@TheSpasher]

Awesome video.

[@rs5001988]

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

[@hallorolf5070]

i am so glad with driving a 4 stroke

[@TylerQueen213]

Why a rebuild on a two stoke is really cheap. A four stroke rebuild would be thousands of dollars! Plus you have so many pieces to put together on a four stroke.

[@D34DA11V3]

Lol until you have to buy a new piston for your thumper witch costs 400$ plus other shit is another 100$ then you have to get your valves checked and then the jug is problably a shit ton of money so i don't know why your so glad

[@D34DA11V3]

And to top it all off your twice as slow

[@hallorolf5070]

i live in germany and the price of our gasoline is about 1.60€/Litre. This is 2.11Dollars/Litre. Now imagine you bike consumpts up to 10l/100km. You would be poor in a month. But everything else you said is absolutely true and i would love to have the 40hp of a 2stroke engine instead of my 15hp 4stroke...

[@DerTechniker]

come on guys, it doesnt matter if 2 or 4 stroke...the real enemy is the quad !!

[@DYhondaman]

Is that the wiseco racers choice piston? Or is it something else? jangho9

[@wva_trucks2336]

Best rebuild video online now if you could do kx100

[@tedenduro243]

Dream bike !

[@AnDrEw122100]

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

[@AaronMartinCOOLVIDEO]

Nice job👍

[@suelindsay3182]

sweet piston dude but why wouldn't you clean and wire brush the bolts and use anti-seize on them for future rebuilds? Nice video though

[@t.inovations0952]

what oil do you use for your bottom end cause I have a kx250 and every time I put it in first I makes a loud clicking noise when it goes in gear

[@9drewbreez]

+troy weems use tranny oil not motor oil

[@chadwems]

I would look up the manual for that year so you'll know what to use. oh yeah my name is Chad Weems.lol. I'm part of the southern maryland Weems family.haha

[@willvanallsburg4703]

meant to do that

[@JasonsBack100]

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

[@TheIceBullet]

great job man!!! very nice"""