hello the easiest thing to check is going to be the clutch pre travel. with the engine not running the tran. wil go in and out of gear with out pushing the clutch. the way I set mine is to give about 1 to 2 inches of pedal travel with no tension if this doesnt help ther may be a problem with trowout or fork. the pre travel adjustment is at the trans. wingnut on cable. while you are setting you can check fork. the throwout can be checked with motor out.
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