Hey guys! Looking for some help on a transmission issue. Broke the long shift fork shaft. Replaced it with OEM. After reassembly and test drive, 1st gear -3rd gear work fine. Shift into 4th gear and there is grinding for a second or 2 then rear wheel lock up. Any insight , help and info much appreciated.
RM125 1998 Transmission Problem
- Thread starter TeamGotOil
- Start date
We disassemble engine and trans piece by piece to verify nothing missing...
One shift fork has damage( some grinding on the inner curve. I assumed due to shaft breaking. I will post pics tomorrow evening.
Complete rear wheel lock up when shifting into 4th gear?
Just my 2 cents,
Sounds like it needs to be completely disassembled again and inspected for damage/cracking.
How did you break the shift fork originally? Was it hard to shift before it broke?
Something wasn't installed correctly if it worked fine before you replaced the shift fork.
Another thing bugging me is that the OEM shift fork could be wrong, somehow.
Can you compare it to the old one?
-BIG DAN
It was a broken shift fork shaft, not the fork itself. However, while doing more research on another forum I ran into this thread- http://www.thumpertalk.com/topic/1101103-2005-rm-250-having-problems-with-3rd-gear/ . The pics of his trans and fork damage is identical to mine.
Complete rear wheel lock up when shifting into 4th gear?
Just my 2 cents,
Sounds like it needs to be completely disassembled again and inspected for damage/cracking.
How did you break the shift fork originally? Was it hard to shift before it broke?
Something wasn't installed correctly if it worked fine before you replaced the shift fork.
Another thing bugging me is that the OEM shift fork could be wrong, somehow.
Can you compare it to the old one?
-BIG DAN
BTW, yes wheel lock up when shifting into 4th.
Well, we went through the trans again. Thought we found the problem as we went step by step to reassemble the trans. Found I had place a thrust washer where a snap ring should be. Finished reassembly and still same prob. Guess I will try to replace the spacers and forks. Did see some wear on some of the dogs as well. BTW, would a complete trans from a 97 work in the 98.