4-Stroke Motorcycle Cylinder Head Rebuild

In this video we deomonstrate how to rebuild a four-stroke motorcycle cylinder head on a Yamaha YZ250F. If you are not sure what to do, you are at the right place. Our detailed instructional video will walk you through how to rebuild the cylinder head on a modern day YZ250F motor. The steps shown in this video will be the same as they are on a YZ250F and the WR450F and YZ450F. Get all your bike rebuild needs at rockymountainatvmc.com!
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Yamaha YZ250F Top End Rebuild | Part 1
• Yamaha YZ250F Top End ...
Yamaha YZ250F Top End Rebuild | Part 2
• Yamaha YZ250F Top End ...
4-Stroke Motorcycle Cylinder Head Rebuild
• 4-Stroke Motorcycle Cy...
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[@doubleclutchinjammingears3391]

Oh wow.. Most detailed and informative video I’ve ever seen about this procedure. I can’t believe this doesn’t have a million views..

[@brandonrides]

It does now!

[@justinpeters7166]

haha was thinking the same thing.....not ! lmao

[@sprenky72]

Thank you for taking the time to do this! Very helpful.

[@dirtbikepro_5375]

Indeed it was

[@mwilcof9332]

Outstanding video, thank you

[@gabrielhartung8801]

I sure am glad RMATV likes Yamaha's as much as I do. YZ 250, 250F and banshee build videos!

[@arlo12345678910]

Great vid. Thaks RM!

[@stevenremmenga5907]

thanks brother i appreciate the help

[@goldbunny1973]

Excellent video; I just wanted to see how difficult this job is. I am never doing that LOL.

[@matterrington7375]

Love the video content

[@user-jk6we8ny2p]

عالی ممنون از راهنمای هاتون

[@TomSlickery]

thanks for the video. I have kibblewhite ss valves and cylinder works head.(All brand new parts.)Should I still lap the valves?

[@ghost482mb]

Didn’t know owning a dirt bike will make me an engineer

[@connersnow298]

awesome vid and edits and filming and bike and shop

[@chandler4792]

Thanks for settling my decision to only own two strokes. I bet someone would charge $1000 if they did all of that. Plus install the head and check the valves.

[@JayDeeFrm7400]

WARNING before you make the mistake i did on my 09 kx450f I reused the valve keepers that was on it thinkin they would hold but of course after about 10-15 hrs on a new rebuild and it let one of my exhaust valves come loose thankfully it didn’t go through the piston or grenade the cylinder but it shattered the valve bucket and threw a couple pieces of the bucket into the head smh i hadn’t road it but a few rides since i built the bike worked on it for 4-5 months (it was a full rebuild plus i had work 6 days a week now i’m back to where i started lmao guess that’s da shit happens when you’re apart of dat #kawi life😅

[@findvoltage]

So, can you work the cam journals on the head or do you buy a new head?

[@AustinLowe]

Will you ever do a top end video on a late model ktm 450 sxf?

[@rideordivekerry4830]

saved all 3 videos

[@rmatvmc]

That's what we like to see *Ride or Dive Kerry!* Thanks for watching

[@Brandenuzis]

My 250f had 403 hours until I had it rebuilt, even tho it’s way more expensive to rebuild a 4 stroke I’d still pay 1k+ once every year I have 250 and a 250 f and I like my 4 stroke a lot more

[@RideWithTheWolf]

If the valves pass a liquid leak test, are they ok for now?

[@Bosniakov000]

so you have complete cylinder head for honda vt750 ace ?

[@fixittrey9913]

Does this work for a 2015 yz250fx also??

[@jakeparsons4843]

Do you have performance heads for kx250f 2010

[@dylanturley7291]

What do you do if you can’t get the buckets out?

[@o2r924]

What is the part number of the toolbox that is on the rear guard of the bike? Thanks

[@fatguyonalittlebike3336]

Maysure :)

[@bongowoop]

Valve collets, weird hearing it called valve keepers

[@chrisdobbo8938]

do 2 stroke top end rebuild!

[@rmatvmc]

Here ya go! kzbin.info/www/bejne/Y3epeoqqprpokMU

[@Novaghast7]

When doing this, is it necessary to buy all new parts such as valve springs, spring seats, etc or can I just buy new valves and use the old springs and seats? Also at what point can't you shim anymore?

[@gordonwbell]

Novaghast you need to buy springs as a minimum, they wear out really fast at those high rpms, meaning they will fatigue and lose some spring pressure. This will result in valve float and spring failure. Everything else can be reused.

[@hreindustries]

you can measure springs to make sure they are with in spec, of course if not replace them.

[@Apizz]

Are the Titanium Valve will damage your head engine or piston???

[@stevenmcilwrath5371]

Can you actually get an accurate valve clearence measurement when the cylinder head is off the bike like this or is he just showing how to do it when the cylinder head is on the bike etc

[@brandonfuller116]

valve clearance is not affected by the head being installed on the motor. It is way easier to do this and reshim if necessary when it is off the bike.

[@Aabbcczzxxcc]

why i can't see this video in my subscribe menu ?

[@stevenmcilwrath5371]

Can anyone tell me the name of the wee tool he uses to measure the inner diameter of the valve guides?

[@rmatvmc]

If you look up "small hole gauge set" you should be able to find them that way!

[@tomwhicker7951]

How do you know when to replace a piston/valves on a four stroke?

[@quadcityracing]

You can pretty much go 50hrs on a 250f, if you clean your airfilter and change the oil every 3hrs for maintenance. If you ride easy and stay off the higher rpms, you can get 80hrs. If you race, id change at 25hrs. 450f's will last longer, id say 80hrs normal. Less if you race and some have over 200hrs on stock piston.

[@pseudoprodigy]

Tom Whicker you would want to do a compression test and if its out of spec do a leak down and pinpoint the cause(s).

[@waylongasser9905]

I forgot where they came from what if I just put the reatainers and shims where I want

[@doubleclutchinjammingears3391]

Bay Thomas lmfaooo, doesn’t sound like a good idea to this guy. How’d it end up working for ya? 😂

[@Kyle-pl6rl]

Will you do a bottom end video?

[@rmatvmc]

*Stevie Wonder* Coming soon!

[@cameron2931]

Great website!!! And First

[@david-yj4qw]

which yamabond was used #4 or #5?

[@rmatvmc]

I believe we used Hondabond 4 in this video which is similar for Yamabond 4.

[@PimpBeetle138]

Meysure.

[@renostubbs8504]

Where in America are you guys? Do you ship overseas? I live in the Bahamas, and I bought a 2002 Yz250f that needed a cylinder head that was crushed, it was gone beyond repair. Thank you for channel,I have subscribe.

[@rmatvmc]

We do ship overseas and have locations in Utah and Kentucky. You can check out our website for parts and accessories here: www.rockymountainatvmc.com/ Thanks for checking out the channel!

[@renostubbs8504]

@@rmatvmc Thank you for your response, we appreciated the video

[@xdwaynex4849]

is intake and exhaust springs the same?

[@xdwaynex4849]

and is the valve lifters the same ?

[@braedenallen4539]

Yes but you can get kits with different color paint on spring say red is a pound stronger than blue etc..

[@jackdempsey85]

Yeah I think I'll get someone else to do it

[@nickj6275]

Step 1 remove head Step 2 take to a professional to have it done Step 3 pick up and install easy and done right

[@colinmullins9155]

🤣🤣🤣amen brother

[@thulsa5218]

Trouble is most shops arent worth a salt and break more things than they fix

[@albundy5764]

You left out "pay them a lot of money".

[@shopdreamin372]

I made a video aswell where I replace some valve seats and rebuild the head. Check it out

[@kuldog7704]

Has anyone rebuilt their bike from this vid?

[@petersouthernboy6327]

Do NOT allow any shop to use a Neway cutter on your motorcycle seat. Newen is by far the best, Serdi is second best. Rottler and Sunnen are also pretty good. Do not allow a shop to use stones on your valve seats.

[@tratloucany]

why

[@petersouthernboy6327]

@@tratloucany because modern CNC controlled valve seat machines with cutters are orders of magnitude superior in terms of accuracy and getting a high performing long lasting seal. Also, stones suck on beryllium copper seats and inconel valves

[@tratloucany]

@@petersouthernboy6327 In 2007 rmz 450 manual are these cutters drawn for use.

[@tratloucany]

@@mikeolson7188 We say Třikrát měř, jednou řež.

[@danhopkinson2811]

arghhhh. its pronounced mesure not mayyysure

[@duganfr]

No. It's pronounced meh-shure. 😄

[@anunentitledmotivatedmille7731]

Have you ever gotten done watching a video on your phone and you reach over too use your mouse the you haven't in 5 years.

[@brad7718]

Good info, but this is extremely boring