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- Опубликовано: 29 фев 2024
- Part 2 of the YZ125 transmission repair. In this video I install the new gears, true the crankshaft, and bolt the cases back together. Will be the same from 2022 to current model.
Link to part 1... • 1:11 Yamaha YZ125 Tran...
Link to part 3... • 1:11 Yamaha YZ125 Tran...
Link to the video on crank truing... • 1:11 YZ250 True Story ...
Donate Race Fuel link... www.paypal.com/donate/?hosted...
Thanks for watching!
upallnight91@hotmail.com 
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For those that aren't aware, Stuck Nutz was started in response the Loctite effort to shut down riding trails in Colorado (initially). Their Mission: Trail Advocacy and Access. Growing the Off-road Community. Made in the USA. Lets support them.
Right on! Think I will order some of that up!
here is a link if anyone is interested stuck-nutz.com/products/red-nutz
Five stars! I'm putting my grandson's YZ 125 back together right now and this is the most complete video I've seen, and I've watched quite a few. The only thing I'd change is I'd use a torque wrench, 'cuz I don't have calibrated hands.
Thanks! Glad to hear it was of help!
Important reminder when joining the cases remember the two dowels and o ring for coolant. That was the o ring needed in the beginning of the video
Yes sir!
I have a brass hammer and a piece of brass round stock ( 1 inch diameter by about 10 inches long) works great for hammering stuff you don’t need to be rough on. Great job as as always.
Right on, would work for a steering stem bearing too!
Hey 👋, just wanted to mention a trick take on the 350* oven and a 0* freezer bearing trick. Turning a press into slip fit. I only use the oven for the case at 465* , and room temperature bearings so that there’s no condensation. I learned about it from a chainsaw shop manual. I thought it was easier when I just did a 06 crf150f although I did it totally old-school on a wood stove and addition of instant read thermometer.
Hello! For sure, works well! The reason I keep the case a little cooler at 170 degrees is because I often still have some rubber seals on the case and are looking to try to keep them in good shape. But with no seals to worry about it would surely make it slip in easier with more heat.
Yeeessss I’ve been waiting for this video 😂
Nice! Part 3 on Monday will be the fun one. Get to start her up and test ride it!
Good video I'm learning so much from ur videos thank u I would have changed piston it could go bad an mess up cylinder like mine just did IL be replacing my piston every 15 hours cylinder cost to much piston are cheap since I did top end my old yz125 2003 has so much more power its amazing an another thing is I bought my bike didn't have 2 gear so my mechanic under cuted gears an he fix it I tried buy new gears but 2005 an up can't get new gears 2003 so I bought a used transmission off of eBay I have a box full of parts so when I break something il be ready an next week I'm getting an extra cylinder I all ready order a new piston this bike been given me he'll lately but like my mechanic said look how much ur learning I hate to see it this way but is what it is
Right on! Honestly thats how I learned. Bought a 1983 YZ250 that was missing 1st and 3rd, leaking water pump, and other stuff. I would fix one thing and it would break another lol
Another top-notch vid! Unbelievable with this thread locker company that shall be never named again.The eye thing started at 43 with readers for me. At 50 it progressed into full perscription. Happens to most of us. It gets expensive too. Now I need glasses to ride so the goggles won't work. I have been researching OTG goggles and a company that allows you to insert perscription lenses directly into the goggles instead. I m not on the bike that often except for a quick local blast latley so it hasn't been an issue. Gotta figure it out before they say no riding without proper saftey gear. Enjoy Datona! Remember getting old is a privilege.🤓
Oh man, yeah. The wife wears contacts when she rides. So far at distance mine have been good, its just up close is getting tough. Still thankful though thats for sure. Thanks, Daytona was awesome. Probably one of our better visits there, great racing and all. Was a great weekend. Yes sir, A privilege for sure. thats right
🤓 lol
Won’t be buying locktight again 🤙🏻
Me either lol
👍
🤙
I'm pretty sure as soon as you start that.2 stroke motor up the crank will center itself in the boards of the main bearings.Just from running and vibration it will center itself in the bearing bores.
Some do, some don't. Why not start out with it centered to give it the best chance
Use stuck nutz thread locker
😂thats a funny but cool name for a thread locker
😂😂😂😂😂
In my opinion, if you've got a bike tour down that far and you can't afford to replace the bearings, then don't put it back together yet. Wait till you can afford it. Why go through all of that work? Turn that motor down to bare castings and then put old bearings that are worn out back in it. That to me is just so counter intuitive. I don't know why anyone would want to do that. Even if you don't have the money to replace the bearings, they're not that expensive man. Just wait till the next Payday and go and buy the bearings man, just do it. Don't have stuff or you're gonna end up with a half ass motorcycle that don't work great. Indeed, you should be using blue lock tight on any bolt that goes inside the motor blue lock tight and you use heat to get them back out.Don't just try to take him out without heating them up.Because all you'll do is strip out the screws. My favorite way is to take a soldiering iron and hold it on there until it gets good and hot and then take it out with the screwdriver, and I'll come right on out with ease. Will neither be hard anymore because the lock type that's in there will liquify again. But if you try to take out lock tighted boat bolts without heating them all it does is tear s*** up..
Hello. Of course new bearings and such is always ideal but if inspected good and all checks out well it will be ok to reuse. I always suggest new bearings but in the end its up to the owner. In this case his bill was already up to 2000 bucks and he just wanted to get the grandson back on the track with what he could afford. If I didnt think it would survive I would have told him we can put it together till we have these parts. But I knew it would survive so I suggested and explained the risk and he choose to reuse them. That being said the bike has had at least 25 hard hours put on it since this video and alls holding up well. I like red thread locker for the inside of motors, I dont trust blue much for that type of work.
I’m currently rebuilding the same model. 2022. Bike has 4 hours on it and all 4 transmission bearings were very noisy and about to fail. Did you find a cause of the failed bearings in that one? I can’t find any oil passage that allows oil into the transmission side of the cases. When I fill through the oil fill up to the level plug it doesn’t transfer to the transmission side. Thinking the bearing for the shift drum should not have a seal
Hello. The oil is slug up by the clutch and there is a little area up top where catches it and sends it to the transmission side. The oil makes it back to the clutch side by the shift drum and through the shift drum bearing. Never did find what caused the failure on this one but the owner is known to run the oil well over 10 hours which is way too long. One thing I have noticed is this bike needs time for the transmission to break in. A lot of the gears ride pretty tight on the shafts.
@@UpAllNight91 I agree on everything except the oil passage through the shift drum as the bearing from Yamaha came with the seal still installed. I noticed yours was the same. I’m pretty sure mine failed because I did an oil change and just refilled until oil was coming out the check plug which left the trans empty and total oil amount too low. (Noise started 10 minutes after my oil change). I’m very curious if later serial bikes maybe have the seal removed from the drum bearing? I’ve had bikes for 30years and never had trans bearing failure. That’s why I’m stressed to find the cause. Thank you
@@petermcphail8399 Hello. I spoke with my brother who has a 23 and he said it does have a hole going from the transmission side to the clutch side down lower. I dont have one here open to look at right now but he investigated his pretty well when his was open.
U going to Daytona
Yes sir! Just arrived!
2015/and 2018 participant. As specter
@@lawrencecorbo6586 Right on! You raced it in 2015 and 18?
Why is my pilot jet on yz 125 getting clogged every ride??
I took it off once cleaned it out it back together and idle surge went away then started 2 mins later did it again cleaned whole carb started again 2 mins later?? I’m confused? Bad gas? It is 91 10 ethanol that sat since November
Hey! Your the anonymous person on Fb 🤣😂🫵🏽
@@Factory928AC yes 😂😂😂
????
@@JackMacdonald-ih3htIf the pilot is getting clogged you have trash getting in the carb and clogging it. These bikes have a fuel filter built into or on top of the fuel petcock. I would remove the fuel petcock from the tank and check that or replace that. And also replace the fuel line from the tank to the carb (I have seen old fuel lines come apart on the inside and clog jets). If both of them are good the pilot should stay clean
You do understand that there is an.S in the middle of the word transmission don't you?
Oh, I thought there was three S's in middle. Shit had it wrong all along
That's hilarious.You say you're blue printing and you don't even own a fucking torque wrench.... This is the worst blue printing ever...hahahaha
Who said I don't own torque wrenches lol.
You have the engine completely tore down to bare castings.If you know that the piston is bad and is going to need to be replaced soon.Why not replace it now?While you got the d*** thing to work hard.Why put it together and go through waste in the set of gaskets?You don't make no damn sense sometimes.
Its a customers bike. I told him let's replace the piston while in here. He opted out. All I can do is suggest. That being said a month later he brought it back to get a new piston put in.
Man, if the owner wants to reuse crank, bearings and s*** like that I would have refused the whole deal man. I would refuse to do it with old bearings. Because you know what's gonna happen. That crank's gonna end up locking up tighter than a nun's ass and then you're gonna look like the asshole because you didn't change the bearings, even though the guy told you not to, they're gonna look at it as it's your fault because you built the engine. So you should have refused this job using old bearings and shit like that Man, you shouldn't have took this job at all if he's wanting to reuse bearings and all that stupid shit. Saving a few pennies to wreck the whole fucking motor!!!
Well I like to replace everything when I can. That being said this bike has had probably 25 to 30 hard hours on it since this video and its going well.
There's a reason you don't get negative feedback, you know what your doing and have an excellent presentation of your work. There is allot of wannabes on the net but your not one of them. Have fun at the races. 🏜👍
Thanks and thanks! Just arrived at Daytona. Hoping for no very little rain