Posts
6
Joined
12/20/2021
Location
Encinitas, CA, USA
I have a new 2022 Yamaha YZ250 - 2 stroke. Yesterday I took it out to the track for the 4th time. I haven't raced it yet just doing laps - sitting trackside with the bike in neutral I heard a loud grinding type sound and the bike was starting to crawl. I went and changed the oil for the second time, it rode fine on the track but then did it again with bike in neutral - a horrible sound and grabbing clutch. I've seen questions on other forums regarding a similar noise - but have never seen a solution. Mostly people seem to think it's worn out clutch parts - but with this bike that is not the case. Any thought would be appreciated.
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Did you ever find the issues? Mines been doing the exact same thing and it’s a 2022 as well. I took the clutch completely apart and never seen any issues. Must be something inside the transmission.
I forgot to update this post. Problem solved. I had drained the oil at the track and refilled until oil came out of the "oil check screw" - once it started coming out I thought I was good. The problem is that the oil is slow to fill the center case, so the right side is full up to check point but it is slowly filling up the center case and the overall level on the right side drops. So the problem was not enough oil - now I measure out the correct amount in a ratio rite and add more slowly. no other issues sent.
Thanks for the rely. I will try doing that. I have checked mine and it was always coming out the oil level bolt but I might try adding a little extra and see if there’s a difference.
Put 850ccs of oil in it every time. Yes +100 over what the manual/clutch cover says. Its just a little extra insurance and won't hurt anything.
I got 120+ hours out of my YZ transmission running it like that and changing oil every other ride. I actually only rebuilt it because I hit false neutral between 2nd and 3rd from some super lazy late moto shifts. It was otherwise still functioning perfect.
Where do the false neutrals come from? I don't understand how transmissions work very well so how can this "become a problem"? I was having trouble shifting not too long ago and the bike wanted to stay in neutral and stuff but I chalked it up to a terrible day because it was truly the worst i've ever been on the bike lol. one of "those" days.
Well, for the YZ specifically, the dogs (if I'm remembering correctly) on 3rd tend to get rounded... As they wear, there is an increased chance of hitting false neutral, which is no man's land between the gears. 3rd does not have the best design. It's just a weak point in the transmission. I'm surprised Yamaha didn't address it when they updated the 125 with stronger/wider gears a couple years ago.
Still, with some care they last 100+ hours easily.
Another mistake people tend make with these transmissions is when they do need to repair, they cheap out on parts. I'm fairly certain you have to buy 2nd, 3rd, 4th, and 1-2 shift forks for it to be "new" again. Anything less and you'll be back in there quicker than last time to fix it again.
On my 2005 Yz250 I learned the hard way about that “fill level plug” or whatever it is. IGNORE THAT PLUG, and put in how much it says on the clutch cover and manual. My bike suddenly started grinding like I was engaging the kickstarter while the engine was running. Had to replace some gears after that fiasco
Pit Row
Very intimidating work, is it difficult to do this? Maybe it's just because I've never split cases before but I'm not "mechanically challenged" particularly.
Take your time, take pictures, organize all the parts you take out, and it's easy. There's a lot of documentation and videos out there to guide you as well.
I'm going back to a YZ next for a lot of reasons... including the simplicity and being able to do complete rebuilds.
I am kind of wanting to keep my YZ as well for this reason. I can just ride it and they're fun to mod and the suspension is world class out of the box and fun to ride. It's not the best lap time turner probably but it sure is a blast. it's like the swiss army knife of a dirtbike except... its like 9/10 good at everything.
Rmatv has a lot of the videos to rebuild the yz250
Yup had 6 yz 250's. Fired up my 16 one day after an oil change and next thing I've got some busted gears. Must have over filled it that day was my guess.
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