1981 YZ125 shift star won’t advance, or go down in gears.

dcfitz
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dcfitz
Edited Date/Time 7/27/2019 9:54am
So, my son and I rebuilt my 1981 YZ125. I’ve road it 5, or 6 times with no issues. My son comes to visit and rides it for his second time, ever, and ends up walking the bike back. He said he hit some big bumps and also ended up with a front flat. It wouldn’t go back into 1st he said. After tearing into the clutch side to look at the shift pawl and shift star, it just doesn’t want to go out of third. I tried by spinning the rear wheel and attempting to shift up and down, with no luck. Did my son bend a shift fork? If so, which one? I hate to split the cases again, but I will if I have to.
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dcfitz
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dcfitz 7/24/2019 7:35pm
7/24/2019 7:35pm

Matt Fisher 7/25/2019 5:43pm
7/25/2019 5:43pm
Cases are coming apart. Likely a bent shift fork, possibly something else.
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project racer 7/25/2019 6:54pm
7/25/2019 6:54pm
Have you checked the detent spring and plunger that rides against the shift drum ?
2
dcfitz
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Valley Park, MO US
dcfitz 7/25/2019 7:57pm
7/25/2019 7:57pm Edited Date/Time 7/27/2019 9:54am
Yes, the shift pawl and spring are the first thing I checked. I’m in the middle of the tear down now. I think it’s a shift fork that’s bent. Will know soon. Thanks!

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