1981 YZ125 Shifting

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3/5/2018 2:39 PM

I rebuilt my 1981 YZ125 and put in new clutch plates, as well. It starts, idles and revs well, but when I try to drive it it acts like I'm starting in 5th, or 6th gear and stalls. I've set it on my bike stand and I can find neutral, then when I push the shift lever into 1st, the rear wheel spins, but when I release the lever, it pops back out of what I believe is first gear. If I pull it up into what I think is second gear, it stays in that gear and the wheel spins, but it doesn't act like it wants to go into any higher gears. Is it possible that when i think I'm popping it into second, I'm really hitting sixth gear? If that is the case, why am I able to hit neutral by clicking own on the shift lever?

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3/5/2018 3:36 PM

Transmission is not together correctly is what that says to me.

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3/5/2018 5:17 PM

It sounds like the shift drum and forks were not installed correctly.

Paw Paw

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3/5/2018 5:39 PM

Paw Paw 271 wrote:

It sounds like the shift drum and forks were not installed correctly.

Paw Paw

When we disassembled the engine, we kept the tranny together in a bundle. So, I’m not sure how it could have gotten back in incorrectly. Yet, I don’t know what else it could be. Thanks!

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3/5/2018 5:40 PM

SmokinJoe439 wrote:

Transmission is not together correctly is what that says to me.

Yeah, I’m worried about that. Will require splitting the cases again. Ugh!

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3/5/2018 9:33 PM

dcfitz wrote:

Yeah, I’m worried about that. Will require splitting the cases again. Ugh!

been there, done that...lol.
pull it apart again and check the shifting BEFORE you put the bottom end back in the bike.

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3/6/2018 2:18 PM

Check the shift fork before you go pulling the motor apart.

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