1981 YZ125 Shifting

dcfitz
Profile picture for user dcfitz
Posts
111
Joined
3/5/2018
Location
Valley Park, MO US
dcfitz
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?
|
Paw Paw 271
Profile picture for user Paw Paw 271
Posts
3640
Joined
4/3/2013
Location
Benton, LA US
Paw Paw 271 3/5/2018 5:17pm
3/5/2018 5:17pm
It sounds like the shift drum and forks were not installed correctly.

Paw Paw
dcfitz
Profile picture for user dcfitz
Posts
111
Joined
3/5/2018
Location
Valley Park, MO US
dcfitz 3/5/2018 5:39pm
3/5/2018 5:39pm
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!
dcfitz
Profile picture for user dcfitz
Posts
111
Joined
3/5/2018
Location
Valley Park, MO US
dcfitz 3/5/2018 5:40pm
3/5/2018 5:40pm
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!

The Shop

See All »
mxrose3
Profile picture for user mxrose3
Posts
2170
Joined
8/17/2006
Location
Delmar, DE US
Fantasy
1046th
mxrose3 3/5/2018 9:33pm
3/5/2018 9:33pm
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.
mb60
Profile picture for user mb60
Posts
4741
Joined
3/7/2010
Location
GRAPEVINE, TX US
mb60 3/6/2018 2:18pm
3/6/2018 2:18pm
Check the shift fork before you go pulling the motor apart.

Post a reply to: 1981 YZ125 Shifting