How To: 4 Stroke Top End Rebuild (2016 CRF250R)

Full video on replacing the top end of a 2016 CRF250R

[@c3696]

Nice video, I currently have my 2007 CRF250 completely stripped. Can't wait to get it back together 👌🏼

[@Henry.Riccato-Smith]

Thanks for posting...This helped my rebuild! Two points that were glossed over - 1) The throttle body + air box boot are horrid to re seat! 2) Remember to wind out the cam chain tensioner when re fitting it (Unless you've got the tool to lock it).

[@matthewrichardson2804]

Thanks for this vid really helped me. You are a genius and a great teacher!!!!! I wish I could meet you in real life!!!!

[@rykerthompson9731]

Thanks for the help! I was a little scared to do a rebuild on a 4 stroke. I feel like I could do this! Thank you! And please dont delete this video I might use it here sooner then later :)

[@carsonbarasha9238]

Sorry for the late reply but I’m glad i could help and make an informative video, the video will always be up so feel free to watch again and ask questions if needed

[@jacobotto6256]

Wtf does that have to do with the video and why would you hack your girlfriends account. Must not have a very good relationship there son

[@rehmanvirani8415]

@Hye Kaarlela this dude really tryna scam people . Creator if your reading this delete hye kaarlela comment before someone gets scammed for a lot of money 💴

[@marnellipodador4924]

Thank you for the video sir helps my daily work hope that more video you made sir...goodbless always.

[@mikestockdale808]

Excellent video

[@dixoncider7256]

Great video. Thank you.

[@everysecondoutside5547]

Dude, you’re awesome

[@dylankalinowski5093]

Great video! I have a 16 as well going to be doing a top end rebuild and make sure my valves are in spec! Only question I have is how the rings go on the piston. As well as where did you purchase ur top end kit and what brand! Thanks looking forward to hearing back!

[@jondoe4667]

I took the radiators off to get them out of the way. But I had a hell of a time with the intake boot.

[@viktorjohnsson4122]

Thanks for the help bro i have a 2016 too :D

[@LSForce10]

@Jean-Frédéric Baillargé M3!

[@offroadguygavin6074]

How offen do you rebuild

[@nino3958]

What compression ratio are you running on that piston ?

[@maddysmadness2178]

thanks for the help bro😆😆😆

[@FREEDOMSYNDICATEOFFICIAL]

Does a 2007 crf250 have nikasil on the cylinder walls?

[@David-lx6yc]

yes

[@juanperoquejuan7198]

How many hours got then pistón ?

[@dpracing2528]

hello my friend congratulations for your video, i am brazilian i have a 2008 crf 250r, i have the following problem: When I run at high engine speeds she throws a lot of gear oil out of the gasp, why does this happen since the engine has 2 separate crankshafts, can you help me? Thanks

[@carsonbarasha9238]

I would recommend replacing your gaskets where it’s throwing the oil from, if there’s any gaps the crank case pressure can throw oil through those gaps, hope that helped. Also if the crankcase pressure it very high that can indicate too loosely gapped piston rings which allows combustion to get by the piston, rings and a piston are fairly cheap and should help with the issue

[@louisscott9466]

How much did this cost you

[@nolanstefanik7182]

If it’s 2010 or newer it’s not a choke it’s high idle switch

[@robbietucker7815]

Piston and rings just because the old ones were worn out or was it seized up at some point??

[@carsonbarasha9238]

Robbie Tucker it just had around 80hrs on the top end, just a bit of preventative maintenance

[@jondoe4667]

I'm doing the same to my 15 right now. If you wait until it blows up it will cost 4 times as much to repair because it will usually hurt the head, calves, and cylinder.

[@richiedefranzo3836]

Does it matter what temperature it is outside when breaking apart the top end and rebuilding Leah let me know

[@richiedefranzo3836]

Thanks. I appreciate it. The information you have given me has helped me a lot. Thank you very much. Have a great season.

[@richiedefranzo3836]

I ain't being sarcastic at all. That's not in my nature. I'm just wishing you have a great season. And thanks for the info. I appreciate it.

[@bennyrocks1982]

T-bars, ratchets, spanners? pffffft rattle gun goes ugga dugga done ;)

[@gottdirtt]

So you just installed the cylinder without deglazing it? If you didn’t deglaze the cylinder your rings will not seat in. It’s really easy to do if your cylinder was in good shape like like you said.

[@rprokopow]

That would be if his cylinder was glazed. His cylinder still had plenty of cross hatching so no service would be required there.

[@carsonbarasha9238]

@@rprokopow yep, if the crosshatching was gone or wear was uneven i would’ve honed out the cylinder walls but it was still in great shape and didn’t need it

[@joetaylor1141]

How many hour were on the bike before you rebuilt it?

[@carsonbarasha9238]

About 60 hours, the piston and rings were in great shape and probably could’ve gone longer but $80 in preventative maintenance can save you hundreds of dollars if something were to happen

[@LastReign]

Did you have to hone the cylinder?

[@jondoe4667]

You should hone the cylinder anytime you do piston, or rings, or both. If it still has decent cross hatching you don't absolutely have to but it's always a good idea.

[@carsonbarasha9238]

@@jondoe4667 correct, it’s always a good idea to hone the cylinder when doing a top end but i didn’t have a cylinder honer readily available and the bike only had 60 hours on it since new and the cylinder was in great shape so i didn’t feel the need to do it, hope that helped

[@Aidans_Mx]

hey man were did you get those graphics, there awesome

[@carsonbarasha9238]

D’core visuals

[@DSGB2199]

Did you go by any torque specs for cam and head bolts or just common sense?

[@carsonbarasha9238]

I would highly recommend going by owners manual torque specs, i torqued them off camera so you didn’t see it but you definitely don’t want those bolts coming loose or being over torqued

[@TerrickHarden]

I know this is an old video but couldn't you have used a magnet to grab the clip instead of draining the oil and removing the cover at 15:15?

[@carsonbarasha9238]

I tried to but the crank weights made it near impossible to get it out and it was easier to just take it out of the screen.

[@TerrickHarden]

@@carsonbarasha9238 Ahh ok.. That lets me know to never drop that damn clip then lol

[@tylerhamlin2666]

How often should you rebuild the top end on a 250r

[@David-lx6yc]

every day

[@halroy9610]

Manufacturer spect is to replace the piston every 10 to 15 hour's. Depending on how you ride. Race 10 hour's woods ride 15

[@David-lx6yc]

@@halroy9610 are you on crack? on a 2 stroke yeah, on a 4 stroke no. you can easily go 60-70 hrs if not racing on a 4 stroke. and if you are racing then maybe you're right, not too sure tho

[@halroy9610]

@@David-lx6yc nope. I go by manufacturer specs. Nothing spells DNF running you bike into the ground.

[@David-lx6yc]

@@halroy9610 10-15 hrs can't be true. send me the link

[@jesussantander4146]

What kinda oil do you use bro?

[@radbrapps7821]

use 15w-40 truck oil its the best around

[@jondoe4667]

Rotella is good oil. Just make sure you don't get the energy conserving kind. And the back of the jug needs to say MA, JASO T

[@carsonbarasha9238]

I only use the recommended Honda oil that i get from Honda dealerships

[@allgood6535]

Did not need a rebuild!! Another 100 hours left in that

[@offroad_bros_2705]

ok

[@billygun1985]

The dot has to face the exaust and not the intake

[@bear4353]

Screws not bolts, a screw is a screw until you put a nut on it, then it's a bolt