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2003 kx125 not shifting

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Hi, i just bought a 2003 kx 125 and it won't shift into any gear. It is currently in neutral and moving the shifter up and down does nothing. I checked the linkage on the clutch side and it's all intact. I also tried to do it while spinning the wheel. The motor does not run but that shouldn't affect anything right? I feel like my only option is to split the case and have a look at the shift forks and tranny. Any input would be greatly appreciated!

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My guess is your only option unfortunately is to split the case like you said. If the motor doesn't run, who knows what the internals look like. Tranny could be shot, or you could be lucky and it could be something simple in there. good luck!

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Take the side cover off and look at the shifter mechanism.  Most shifter issues originate under that clutch side cover.

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