How to rebuild 2 stroke engine - Yamaha YZ250

We rebuild our YZ250 engine with Paradors, thanks to ‪@dirtniron‬ for putting this video together.
Links to the finished YZ story in RacerX and the steps along the way:
• Racer X Films: 2001 Ya...
racerxonline.com/2022/04/08/r...
• YZ250 Tire & Wheel/Tir...
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Jay Clark/Dirt Bike TV has been around the Dirt Bike industry for thirty years and is always looking to learn and help others do so as well. Give a follow or drop an email if you have any questions or comments. Thanks for watching!
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#yamaha #yz250 #yz

[@builttoride0226]

That wooden frame to hold the motor case is genius. Just saved me a couple hundred bucks! I almost bought an engine stand for my upcoming yz 250 rebuild! Thank you

[@waynereilly9750]

Some people just have an ability to make a complex job look so easy. Just goes to show how good Brad is.

[@medicinelover1769]

i’m planning on doing this soon. definitely seems easy enough lol

[@Fmontes]

Love watching Brad's work. Especially when he carries a couple of coattails.

[@matty8505]

Always a pleasure watching Brad put an engine together..

[@motomatt6752]

Man he is good. Pretty sure I could watch him rebuild engines all day. I can only wish I could rebuild motors.

[@kevinsnow9157]

I don’t trust many people to work on my bikes . I would let that guy work on them . Awesome job man , great wrenching and fantastic video .

[@NObucketLIST]

This is waaaay better than watching the news!! 🤣

[@harleyloco1853]

Was an honour watching this. Credit to your work

[@TheCarlejoseph]

Crazy how great that motor looks after the vapor blasting. Great job Brad!

[@EarthSurferUSA]

I stopped freezing bearings to drop into hot cases because the bearing only shrinks about .0001", and the cold bearing will suck the heat out of the cases causing the bore to shrink on the bearing faster, especially if it is crooked. Not freezing the bearing gives you more time to drop the bearing in a hot hole. Also, before you put in the shafts, you can heat the cases in an over no higher than 350 deg F., and drop all new bearings in the cases. If you start them off straight enough, you can actually hear them hit bottom. But you usually end up tapping some to the bottom of the bore as you burn your fingers on the hot cases. :) I bought a little over for the shop.

[@EarthSurferUSA]

Oven

[@EarthSurferUSA]

Fast forward through the music, and it starts again. Glad I could build my own engines. Enough for me.

[@kieranmurphy7659]

Great video it's amazing how well Brad builds engines I've learnt so much by watching your videos thanks so much for the tutorials I've stripped and re built engines on my bikes by watching your videos so would like to say a big thanks for that 👍 keep the videos coming in I really really enjoy watching them nice 1 😉

[@OW38B]

Outstanding! Brad is top level on that rebuild.

[@TheSlikstik]

I cant stop watch these rebuilds :)

[@3BrothersExtreme]

Great video! Brad is a magician!

[@jeremymullen5378]

🔥right on guyz, great video.. really enjoy watching this guy build bike engine🔥👊🔥🏍🏍🏍

[@spencerclark2269]

Nice! Awesome video thanks for a detailed walkthrough

[@dregsta]

Splendid work! I enjoyed watching this👍

[@HP-hm3pn]

That was great guys! Love it!

[@bobberbear4622]

Fine work there Brad!

[@chadebel2970]

The Music was such a GREAT touch really enjoyed it

[@matjj676]

Excellent, nice work!

[@diyjeff1838]

Nice work!!

[@erichildreth7562]

Man nice work on the rebuild and you used one of my favorite tools, the Motion Pro wrench for the cylinder!! You have to build it right and you knocked it out of the park!!

[@alwaysadventurous7905]

The music is so loud (albeit it’s good music praise God). Awesome video Gentleman thank you for sharing your knowledge with us

[@beardedrancher]

That's quality work

[@philipgatling4889]

Best video I ever watched! I would love to see a full video!! Like to see the struggle and triumph!! GREAT JOB!

[@carls.2071]

Master Craftsmen at work.

[@danielarney9729]

Good edit

[@thetwostrokerebuilder]

Nice 👍👍 but hope you cleaned all that excess sealent of ya went crazy with 😁 looks more professional when cleaned off

[@seanmortazyt]

fantastic

[@SkylarRace]

The music kinda ruined the video for me, was way too loud.

[@kylelangworthy9641]

Great work man I love the song also God is good all the time

[@EarthSurferUSA]

So am I.

[@dilly2023]

Awesome

[@wednesdar452]

That was a super impressive, efficient job!! Beautiful work!

[@tonyt73oz]

Love watching Brad work. His tips for assembly are super helpful. Great job on the rebuild.

[@thetwostrokerebuilder]

Brad and I have something in common. I've been doing engines for many years and still do even after got hurt racing in 20'. In wheelchair now got paralyzed from stomach down, happy I can still do them every day tho 🏁

[@dirtbiketv1]

Happy you can still be working on them too! Glad you’re here.

[@thetwostrokerebuilder]

@@dirtbiketv1 👊👊🔧🔧

[@onenessseeker5683]

Sorry to hear it. What happened? how did you crash?

[@thetwostrokerebuilder]

@@onenessseeker5683 not sure don't remember but was a small double believe or not. Something done million times, landed wrong I geuss so just never know

[@onenessseeker5683]

@@thetwostrokerebuilder was out riding with my son the other day, One second I glanced behind & he was Ok , seconds later I glanced again & I see his bike was completely upside down. I spun my bike around in a hurry & when i got to him he was knocked out wasn't moving. then he finally came too thank God & started rolling up in pain & couldn't breath. He broke his ribs bless. He said he don't know what happened can't remember. & I didn't see what happened either. we was only going slowly as well. They are a lot of fun but are death traps. Also I am very lucky to even still be alive since I came off aa few bad times in the past. don't matter how good you are you can be off at any moment. Peace & love

[@Ranger4444]

Man, he is a artist. I just dropped my 2015 off for full rebuild at my local shop this morning. I wish Brad could do it. I'm in TX

[@StilwellMotovlogger]

Maaaan I could do that engine. These yz’s are easy peazy

[@michaelaapsley7210]

​@@StilwellMotovlogger really where would I have it shipped to?

[@peterbonivart6818]

I'm sure Brad knows this but using an extension to the torque wrench like that changes the torque values and they need to be recalculated. If putting the extension perpendicular to the wrench you don't have to bother with that since the effective length is not altered.

[@barnescycle]

Some times those gears bind on test run because you need both case halves for stability to whoever maybe wondering or having that issue. You may also have to center the crank is the cases with a filler gauge and rubber mallet, the crankshaft may not roll smoothly with new bearing but thus comes the heat cycle to break the engine in. Yamaha shift forks make this job harder than it should be because they are one solid peice unlike Suzuki.

[@EarthSurferUSA]

Bearings should roll smoothly, even when new. There is not break in process for bearings, only a break down process. In fact, I am willing to bet there is no real need for a a heat cycle or any other type of break in process for 2-stroke engines. If put smaller gas 2-stroke engines on my dyno, and beat the living tar out of them right out of the box after being jetted. All I want to do is get the ring seated to the cylinder wall all the way around in as short of time as possible, and that means high cylinder pressures to do that, (where the most torque is at). Out of the 10's of thousands of engines and top end kits I have built, (with good detail), I have never had an engine failure due to a improper break in. If your new bearings are binding, something is not put together correctly.

[@muhammadridha3433]

Saya sangat menyukai mesin ini, saya berdoa semoga suatu saat saya dapat memilikinya AAMIN doakan ya😊

[@riderinsanjose337]

Yes. Brad is a Master Rebuilder. I would much rather hear his comments and the sound of his electric driver then have shit kicker music at a high level in the foreground.

[@Lockomacc]

Has anyone actually rebuilt an engine just from watching videos

[@cindyharryman4290]

hey Jay , long time brother , looking good old friend ..... Dave Harryman

[@scottmitchell4577]

I stumbled across this video yesterday, although I have watched quite a number of videos from Jay. I would just like to say that I think this is probably the best engine rebuild vid that I've seen! It's absolutely superb! A wee quick question as I'm going to be starting project YZ 250 build, after vapour blasting the engine cases etc. what do you use to protect them against corrosion? Brilliant video, keep up the great work! Scott

[@dirtbiketv1]

Glad it was helpful! Email me for questions - contact info in About tab.

[@BikerBenny]

only thing I saw the torq wrench used was cylinder head and cap. I guess if you've done it a lot you can go by feel or know the impact at low setting is sufficient like for the clutch basket

[@kalnafhc4863]

Great vid but I cud do without the music. More narration

[@jackmills1274]

Do you know what Ducati stator people are using to upgrade the yz 250 stator to run lights? 👍🏽

[@1HandTractorLiftClark]

Hey sorry for coming to old post, but how long did this take from start to finish? I am prepping for a 1998 yz250 rebuild. Thanks. Love the videos! ❤

[@dirtbiketv1]

Email Jay. Contact info in About tab!

[@SSMOTO898]

Just bought Vforce reeds, remove stock spacer like you did or add it. Stock engine with pro circuit pipe and silencer

[@dirtbiketv1]

Nice 👍

[@jimmy_dirtbike]

No crank puller... No oven.. No center gaskets.. Not used to this coming from CR250s! Where do you get a slug to heat transfer? I want to try this on my next rebuild.

[@timjaekel3391]

Hey I just enjoyed this video….. I have a problem finding a full rebuild kit for my 1997 YZ250 to include a new crank assembly. Can you point me in a direction, or vendor, or even a part number(s)? I appreciate you both!

[@ThatAngryMoose]

does anyone know what those wrenches he was using with the toque wrench are called?

[@evo5349]

Brad working it.

[@greggnunnelee7650]

No torquing?

[@oprghost7227]

What about the shifter rod????

[@user-fz8fy4zl1c]

New yz250 owner here,don't ride mx just putt around farm,question is I find when the powervalve comes on bike gets to powerfull! Is it possible to hold powervalve in the open position all the time,I could put somthing like a cut off piece screwdriver in the hole you put the powervalve tool in when undoing linkage bolt Would this eliminate the hit,and bike behaves like a pre powervalve motor? Your thoughts please

[@dirtbiketv1]

Email Jay with questions! Contact info in About tab.

[@robertkhan6599]

How come no centre gasket for the case half’s? I always thought you use a silicone sealer with a gasket but maybe I’m wrong

[@danielambrose8165]

Yam don’t use a crank case gasket, they use either yamabond or threebond

[@shakiejake]

10:30 did you put something else on the crank before that little spin washer ? Something to close the gap up on the seal?

[@dirtbiketv1]

Email Jay. Contact info in About tab.

[@shakiejake]

@@dirtbiketv1 it’s okay I’ve sussed out what I was doing wrong

[@dakzmotovlog9746]

Hello sir where to check the frame number? Which web site?

[@danton94]

I have heard you say that you use scrubbing bubbles to clean bikes with. Well, I took your advice and used the stuff on 2 YZ 85 engines and it made the bearings rust almost immediately and white powdery corrosion on the aluminum. Can you respond as to why this happened?

[@dirtbiketv1]

Email Jay Directly for further questions Thanks

[@skyhawk409]

Is that with 8hp more?

[@Jason-im3pz]

honestly, are those hot rod cranks good to run? very mixed reviews on them and they seem to be most readily available aftermarket crank

[@dirtbiketv1]

Yes. Email me for more info. Contact info in About tab

[@vicenteroman5754]

Hi nice video i have yz250 but i saw smoke come out for the breather hose it is normal?

[@dirtbiketv1]

Email Jay with questions. Contact info in About tab.

[@benselby6171]

Does it hurt to wipe off any excess case sealant once the cases are tight?

[@dirtbiketv1]

Let it set up a bit first-

[@frankbatenga3167]

How do I get you guys to do an engine for me how much would it cost I have a 2003 YZ250

[@jeffboyd7780]

Good job except lubing the piston and cylinder. Always best dry.

[@oprghost7227]

So y’all don’t put a gasket in between where the blocks separate??

[@dirtbiketv1]

Email Jay. Contact info in About tab.

[@oprghost7227]

Uhm one scene the shifter rod isn’t on there with the block together then 5 mins later it’s on there

[@No-HAy-Otro]

I would like some work done could I ship to get fixed I’m in Denver Co

[@fabianaguilar1590]

Can you put the rebuild kit that you used in the discripton or on my comment, i have the same engine that needs a rebuild too. Please and thank you.

[@dirtbiketv1]

Email Jay directly with questions. Contact info in About tab.

[@codypolit8285]

What is your guys quote for a full rebuild… “full power train”

[@mikeflynn5651]

Does brad have a shop? I have 1995 Yamaha wr 250 that needs rebuilt.

[@brad5664]

yes sir i have guys send me motors every day ..just hit me up on here and we can work it out if you wan it rebuilt...... Brad

[@mikeflynn5651]

@@brad5664 how do we get in touch?

[@johncashen2170]

A cheaper product then blue locate is ordinary nail polish 😉

[@KEVIN-sd8fu]

One of the easiest engines to build but that transmission can be a sumbitch!!!

[@goodboyringo9716]

I wish the music was off

[@franzv3172]

lolol, same. Funny how bikes are never newer than what they say. lolol

[@franzv3172]

Also, I like the little wood stand for the motor. Simple but practical.

[@seamarsh3756]

You post whole assembly video with no speed up and no music.. like an alternate version..

[@djnormalnorman6590]

Looks like there’s a crack on the bottom of the case

[@dirtbiketv1]

nope

[@andreacattaneo1709]

Why vertex? Wiseco are better in my opinión!! Wiseco single ring is Top!!

[@chrisvikingtaylor3873]

great build but the Jesus music wasnt for me

[@filippoavesani8171]

torque wrench no longer used

[@onenessseeker5683]

not if you know what you are doing, no need for one

[@keithbell8960]

I guess you guys were at a loss for what music to use 😂😂😂😅

[@MrJeffharper47]

Why isn’t he torquing anything.

[@sitnlow4life]

Comedy from beginning to end 🤣🤣 No torque wrench used anywhere ... Beat seals in with a hammer Installs brand new Hinson basket and pressure plate , stock clapped out clutch hub

[@chadrides914]

Christ is King. Amen. (Noticed the Christian music)

[@JohnDoe-mv6sh]

Amen! All Glory to the risen King!

[@TheDaddyNick]

Amen!

[@ericrivera219]

Way too much case bond

[@adambeltz6442]

Stop with this horrible music!!!! It’s ruining the video!

[@rogerboy2234]

No need for the crappy music

[@EarthSurferUSA]

I agree. I don't want noise like that banging my head either. I would rather work on my bike than dance to noise.

[@GNX157]

Just some constructive criticism. Drop the music. 1 it’s not good. 2 I zoned out because it’s worthless to learn anything while ff. Let the guy talk and explain what’s going on, even if he has to do voice over after the fact in post.

[@user-ix7tg5dp4x]

Instagram ???