Question about 2002 KTM SX 400 Racing

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Transmission grinds going into 1st and sometimes pops out of gear

Bike has very low hrs on it .its not a clutch problem. i really need some advice please

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Not sure whether helps you but I had an 1989 KX250 about 16 years ago that did the same thing. My selectors were worn but I had raced enduros fairly hard on the bike & the gear box had copped a fair amount of abuse.
I could be wrong but I would say the motor will have to come out an the the crankcases split in half to get to the gearbox. Pretty easy on a 2 stroke, pain in the bum if it's a 4 stroke.
Bit of advice when you pull apart a gearbox. Lay parts out in the order you take them out otherwise you will have fun putting it all back together.

Posted on Feb 15, 2009

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