My 1989 yamaha moto 4 250 is not shifting gears and not moving when trying to ride it had low to no oil when it happened I dont know what is wrong with it someone please help me.
UPDATE: the high low reverse lever is not working either i will try and mess with it this weekend

 

If you can't get the gear lever to move enough to change gear, it is a gearchange mechanism fault, if it does seem to change gear but doesn't drive, most likely is a clutch gone. If you want to check the rear axle etc, try to feel the universal joint through the rubber boot between transfer case and swinging arm. If you can feel it, engine off, bike in gear, shove the bike forwards while feeling that UJ, if the bike will move, and the UJ is going round the rear end is OK. If it won't shove, try shoving it backwards. Not quite as certain, but if the UJ is going round the rear axle is probably OK.

Clutches, you could try adjusting the multiplate clutch, but if it is bad enough not to drive at all, it probably won't have enough adjustment left and/or the plates would be glazed. So, if adjustment doesn't work, remove the clutch cover and dismantle and inspect both clutches. Centrifugal clutches usually work OK until the shoes wear down to their steel backing, easily seen. Multiplates need each plate measuring for thickness and springs checked for length. Get the workshop manual, it tells you how to adjust the clutch and what thickness, etc, plates need to be.

 

Hi so these quads have a hi low reverse shift lever. If thats not in gear then it can act like its not shifting. I know its a simple question but could you check and let us know. It will help properly diagnose.