1:11

[@tndeere]

Great Job!! At 57 been a. life long rider/shade tree mechanic.Never woked on anything newer than 06 YZ250f .Your a wealth of knowledge and a great mechanic.Thanks for sharing

[@UpAllNight91]

Thanks tndeere! A 2006 YZ250f is really not much different than a 2023, they turned the top end around but otherwise about the same idea from a mechanical perspective. Well they also went to fuel injection and electric start too which brings some electronics into the mix. Thanks for watching and thanks for the comment. Hope your having a great weekend!

[@jmx7656]

Great explanation and views and angles of your video. Always love watching them. Thank you for always posting.

[@UpAllNight91]

Thanks Brother! Should have her up and running today!

[@dougw585]

He makes it look so easy!

[@Allthingsdirtbike]

Don't think there's anyone on KZbin who does this good of a job on detail and showing and explaining everything that needs to be done ,, ! Appreciate your time making these 🙏

[@UpAllNight91]

Ahh Thanks Aaron!

[@jonathangoudy7094]

Must have been a lot of work, I appreciate the videos. You talk like a guy I work with, Rob, very cool guy.

[@UpAllNight91]

Thanks! Surely was a lot of work but not as bad as the KTM 450 I just did the transmission on. 4 stroke of course makes it more complicated. Well at least Rob is cool 😉

[@nickgriffin1502]

Thank you so much for these videos! So much information and becoming familiar with an engine before teardown is a game changer. Thanks again!

[@UpAllNight91]

Your welcome Nick.

[@JW23551]

Replace the Loctite with Stuck Nutz!

[@UpAllNight91]

Yes Sir! My first order of Stuck Nutz just arrived and I'm looking forward to using it from here out

[@JW23551]

@@UpAllNight91 Awesome!

[@mikekraz6193]

thank you nice work!

[@UpAllNight91]

Thanks!👍

[@timbates5320]

Really like your channel,I’m so glad I subscribed love the engine builds,and I’ve learned a few things keep up the awesome work

[@UpAllNight91]

Thanks! I'm happy to hear your enjoying the engine builds. Thanks for coming along!

[@fraco_wr_crfr]

I'm about to rebuild my bike thanks alot Men for the video I've learned alot.

[@UpAllNight91]

Right on, glad to head the video helped!

[@stephenhardwick337]

Absolutely amazing video. I am a 15-year-old up and coming dirtbike mechanic I have never done a bottom end before and this video made it so I could thank you so much. Keep making great videos.

[@UpAllNight91]

Thats awesome! Glad to hear. Thanks for watching!

[@BesharMohamed]

Enjoying your videos from Sweden. Learn a lot from you and inspiring me to do more motor works on my bikes ❤

[@UpAllNight91]

Hello Beshar Mohamed from Sweden! Thanks, I enjoy hearing that and its surely my motivation. Appreciate ya!

[@jshab001]

I don’t comment a lot on KZbin but I had this exact thing happen on my 2015 YZ250F. I am in the process of getting the head machined and rebuilding the bike. Your videos are incredibly detailed and helpful. Praying the connecting rod isn’t bent. Thank you and keep it up.

[@UpAllNight91]

Ahh thanks and thanks for commenting. Do you know how may hours where on your bike when it dropped the valve? And yeah I hope your rod is not bent. I would check it real well.

[@jshab001]

@@UpAllNight91 I don’t! Believe many more than I was led to believe. FB Marketplace purchase and it had clearly been torn into even though the seller said it had not. Steel valves with stock springs, springs upside down. May replace the bottom end just to be on the safe side and have a known good quantity moving forward. Would hate to put all this money into a brand new top end and destroy it because I wanted to save $500.

[@UpAllNight91]

@@jshab001Oh man,, steal valves and stock springs, surely to have a problem. Springs up side down even worse! I agree change the bottom end if you can. I would if it was mine, no question about it. One of the best things you can do if you plan to own this bike is buy a GYTR tuner for it. You can tune it with maps but even better is you can diagnose trouble codes and see live data. You can also check the hours. Even though it gives you the option to reset the hours, hardly anyone ever does which is good when you wanna know the hours.

[@jshab001]

Any tips on removing the chain tensioner bolt. Doesn’t want to budge and it’s stripping out.

[@UpAllNight91]

@@jshab001eww bummer, did you get it out yet? Is the motor in the bike or out?

[@jkilco1]

So grateful for your content brother. Your channel has been incredibly helpful for me as a newbie. Thank you man!!!

[@UpAllNight91]

Your welcome! I'm thankful for you too! Making these videos has been a pleasure, its a very rewarding extension of what I do for a living. Hard to explain but it feels good lol

[@jkilco1]

@UpAllNight91 you got a great thing going, keep it up bro!!!

[@UpAllNight91]

@@jkilco1 Thanks Brother! I plan to as long as the good Lord allows me too. Hope your having a great weekend!

[@damnbikerw5043]

Best channel going for learning the how to/tips/tricks of wrenching on bikes. Please keep up the great content.

[@UpAllNight91]

Thanks brother. I surely plan on it!

[@ufrozoo]

Thanks!

[@UpAllNight91]

Thank you!!!

[@huertix4393]

From Spain!!! Thanks a lot. you really rock bro!!! :)

[@UpAllNight91]

Thank you! Hello Spain!!!

[@kevinwise3179]

Awesome videos-the best I have watched! You might have mentioned it, but why did you install the lower end back in the chassis before installing the head? My guess is it's easier to torque the head bolts. Thanks again for your videos!

[@UpAllNight91]

Thanks! I usually set the bottom end in the frame before installing the head for a few reasons. Its easier to pick up and fit into the frame cradle with the head not installed yet. And the reason you guessed, easier to torque the head bolts. On some models you need to remove the head if you want to remove whole motor.

[@kevinwise3179]

@@UpAllNight91 Thank you!! Are you working on the final video for this build?

[@kevinwise3179]

Disregard it; I found it. Thanks again!

[@UpAllNight91]

@@kevinwise3179 Yes Sir!

[@rogersands5838]

Get you a pack of acid brushes at Harbor Freight, they really cheap, and work really good putting yama-bond on cases, easy to get around stuff.

[@UpAllNight91]

Nice, haven't tried that.

[@lawrencecorbo6586]

Easier said than done ✅ but this man do both well

[@travisrohloff1693]

Great Video! But what was the size of the flywheel puller tho?

[@UpAllNight91]

Hello. The flywheel puller is a 24mm x 1.5mm thread.

[@cannonmead2766]

I’d like to advocate for using the heat , freeze, tap. Method on those bearings. I just restored an 02 yz250 and the previous owner clearly used a press to install the bearings. There had been so much force on the stator side case. It cracked the case. Much safer using sockets and deadblows. Especially using heat on the cases and freezing the bearings. It was already a money put but man it adds to costs to replace cases!

[@UpAllNight91]

I feel ya there. When I first started this channel I had a few comment when I would put the bearings in. Thats not the correct tool, and glad thats not my motor, or glad I'm not buying your bike. At first it bothered me but later I asked myself "hmm wonder how many motors these guys have done?" and then I let it go. Told myself I just need to stay honest and show how I do it, do my best to get others through the job with success. I have done probably over 1000 motors in my years and I have found this to be the safest way to do it.

[@joelatkinson2080]

Yeah, make a video about the bad crank. That would be interesting to see.

[@UpAllNight91]

Thanks for reminding me about that! I'm sure Ross and Joey will let me keep it so I can test it and post a video of it.

[@UpAllNight91]

BTW, Uploading part 4 as we speak. Shes up and running well!

[@GeorgeBarrows-wu9re]

Awesome and super helpful video! I have a quick question. If the compression and oil rings are not perfectly at a 15° angle. Will they fall into place by themselves? If not how do i make sure they are in the right place. Thank you!

[@UpAllNight91]

Thanks. If the rings are not staggered correctly it will stay that way and not find it ways into position. However in most cases it will be ok if its not staggered correctly. The reason for the stagger is to have a better chance of not letting any oil by and smoking. As long as your bike is not smoking and is running good I wouldn't worry about tearing it open. I would just run that top end for its life and next top end then stagger the rings correctly.

[@coop802]

Thanks for such a detailed video. Just used it to replace the top end on my bike. Damn those circlips are tough. I purchased an OEM piston as well but my piston was dull aluminum. Why was yours so shiny?

[@UpAllNight91]

Your welcome. This was a 2022, I think they changed the piston some in some of the years. But I have seen some piston have a flatter look and others to have a more polished look.

[@jadereynolds6963]

@upallnight thank you for this amazing series of videos, this has helped me strip down and rebuild our 2022 yz250f with very detailed instructions and explanations, legendary. I have recently got the bike back together all good, made sure valves are within tolerances, now when the bike is running i rev and when the revs on the way down it pops and backfires from exhaust. I thought this would have bene a timing issue, but the timing is spot on. where else woudl you start looking? Ive read something about the "washer" between exhaust and engine, and also about the idle could be too high, what are your thoughts on this?

[@UpAllNight91]

Hello. Goob job on the rebuild! Yes having the idle too high can cause popping on decel. I have seen it myself. Also if the exhaust header gasket between the exhaust header and exhaust port is leaking that can also cause it. I surely would check them to things. I wont had a girl at the track bring me her YZ250f because it was popping on decel and the issue was the idle was cranked up way to high. I lowered it and it fixed it right up.

[@jadereynolds6963]

@@UpAllNight91 it was the exhaust not sealing properly against the engine. It hadn't sat quite right when I put it on first time. All good now. Thanks for the advice and keep up the awesome videos

[@UpAllNight91]

@@jadereynolds6963 Right on, thats good news you got it fixed up!

[@dougw585]

Get him Beavis!

[@UpAllNight91]

hahahah! Oh hes gotten me before, and good too! Left holes in my ankles LoL

[@aronkile6187]

What about the clevis pin in the crank case assembly, my 2019 has a small sping that goes on the inside of the clevis pin and butt's up against the dowl pin. Is that part necessary? I noticed you don't have it on this rebuild.

[@UpAllNight91]

This motor has a spring around the clevis. Is that the spring you are talking about?

[@DeadRedMoto]

I was chasing myself in circles thinking I lost a bolt and bracket of some sort until I finally found this video. Do you know why the left side timing chain guide has a bolt hole drill but in fact no bolt?? The right side guide has a bracket and counter sunk bolt but the left side has a “bolt hole” with in fact no bolt (come to find out lol) 🤣

[@UpAllNight91]

Hello. I'm not sure why. But maybe its also used in other models where they do bolt them down?

[@larrywarner9314]

I have a friend that raced for Yamaha for few years and now he's one of there engine builders and you would definitely know if you had a race set up on that bike , cylinders are highly modified, and they use cams that aren't made by Yamaha

[@keithalexander36]

Not always on practice bikes or even back up bikes. I have bought tons of ex race bikes.

[@keithalexander36]

Plus I know the team and owner personally not going to put it on blast but they all do it. Often but not always when a race team retires a bike for sale they put back on all the stock items so they can keep their custom stuff.

[@UpAllNight91]

@@keithalexander36 Thats right Keith. Thats what I'm thinking happen here. Stock or OEM parts from maybe even another bike that had more hours on it where put back on it just to sell the bike. And they retained or saved the high dollar modified head, cams, and stuff for the new race bike they have in line.

[@Dylan.lawrence]

how many hours would you go on a 2023 yz250f crank

[@UpAllNight91]

Hello. 200 hours if its a track bike. As long as its checking out well while doing top ends, 200 hours is good for a track bike. For a play bike or trail bike its probably ok to run it much longer than that if its not abused or riden too hard.

[@joelatkinson2080]

Thanks for calling out Loctite brand for working to close off-road riding areas!!!

[@UpAllNight91]

Yes Sir! Glad I was informed of this. Will be looking into other brands from this day on.

[@ChipMitchell-fs6ni]

ThreeBond who also brands under the "HondaBond/Yamabond" names is the way to go. Used by all the Japanese OEM's. @@UpAllNight91

[@bobileksen3496]

hey man im about to do a rebuild on my yz250f 2017 and i need to buy a flywheel remover tool but i don't know the diameter/thread size i thr help to that question would really help me dude

[@UpAllNight91]

Hello. That bike takes a 24mm x 1.5mm thread puller for the flywheel.

[@bobileksen3496]

@@UpAllNight91 lots of thanks! much appreciated man

[@UpAllNight91]

@@bobileksen3496 Yes sir!

[@DQ144]

Water pump. Where is the water pump installed. Thank you

[@UpAllNight91]

I didnt open up the water pump, I only removed the clutch cover with everything still on it.

[@hughiemaceachern5282]

No more 3 intake valve

[@UpAllNight91]

Yeah, they went from 3 intake valves to only 2 intake valves.

[@hughiemaceachern5282]

What u did won't hurt nothing

[@larrywarner9314]

I'll be honest with you there's nothing wrong with that cylinder, and that head is repairable

[@UpAllNight91]

Hello. If you check back to video 1 of this build there is a pretty deep cut in the nickel plating on that cylinder. Thats why we are replacing it. The head could be rebuilt but it would have to be a really good machinist. Yamaha does not sell valve seats for theese bikes, only the head. So it would also have to be a aftermarket valve seat. I have had this type of work done in the past for customers and the head work is so so at best, often needing to be sent back in to get a better valve seal and even then once I was told "it might leak a little water when you test it but it will be fine". Sometimes they dont seal that great without extensive lapping, and then there is the risk of the seat not staying in place down the road. Its just too risky on a race bike going for big jumps in my opinion. a OEM head is cut so perfect, no lapping is needed, no nothing. Just install a good clean valve and it seals right from the start. And I have never seen a OEM heads valve seat come loose.

[@bradley7723]

Only a pro can make what they do look so easy. Question that is off topic, but what breed of rooster is that? He sure has got a good set of lungs on him. 🙂🏜👍

[@UpAllNight91]

Thanks! Hes a Polish rooster. Was was to be a hen but at a young age he started roosten and then we knew lol