Maintenance & Technical > KX250 / KX125

94 KX250 won't stay in gear

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GRARA:
Hello folks, been a while since I've posted on here... But looking for some help as always lol,I was riding a 15k enduro track when my KX 250 started randomly jumping out of gear.... Didn't matter what gear I was in it would jump into neutral without warning..... It got so bad I had to ride back (7k) with my foot pressing down on the gear select in 1St gear.....is this a simple fix or does it require splitting the engine???

Foxx4Beaver:
It could've broken the return spring for the shifter mechanism...but...if the shifter still returns to it's normal position freely, you can scratch that off the list.

Sounds more like a broken snap ring...that's a classic symptom of one being broken...but, you won't know for sure until you split it open.
If you haven't already, pull the oil drain plug...and don't be surprised if you see some abnormal chunks fall out. That right there will tell you it's a snap ring.
Replace all of the snap rings though, not just the broken one....or you might find yourself doing this all over again sooner than you'd like.  :wink:

motopunk:
hard to tell a diagnosis ...   sounds like in first for the spring, that holds the shifter drum in the selected gear , that could be broken , but like Foxx4Beaver said, broken snapring(s) are possible, even worn or bend shift fork(s) ...  just go the safe way and split the engine to see what is wrong ...   

SS109:
One step at a time. No need to split the engine if it's just the shift drum detent spring. I would check the spring first like has already been mentioned. It's easily checked without splitting the cases. If that checks out good then it's time to split the cases.

GRARA:
Hi SS109 thanks for your input,where do I find the shift drum detent spring?

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