KTM SX 250 2013 has a mind of its own

Hi,

Just picked up a 250sx 2013, went out for a test ride and it seems to have a mind of its own!

1st gear fine, change to 2nd and it revs to the max, then drops, revs again and this is without touching the throttle

 

Any ideas what could cause this?

 

Thanks

 

Guy

changing gears can not do this so it must be throttle or ignition related...soooo many things to check

Hi,

Just picked up a 250sx 2013, went out for a test ride and it seems to have a mind of its own!

1st gear fine, change to 2nd and it revs to the max, then drops, revs again and this is without touching the throttle

 

Any ideas what could cause this?

 

Thanks

 

Guy

 

First thing that comes to mind is an air leak.  Make sure everything is sealed from the carb and then check the cylinder.

2nd gear wfo unexpected is scary. Been there before in the woods. Ktms have a history in this category being but not limited to the fuel delivery system. I find it strange that it is only related to 2nd gear. Suggestions: check that you have the updated throttle assembly (recalled). Ensure throttle cable is not binding or getting hungup during steering rotation, make sure cable is fixed at throttle housing and at carb(threaded). Check carb boot cleanliness, check reed valve condition, check carb slide cleanliness and reliability, check that needle is properly situated in the carb, check that the plastic ring on the slide is properly situated, check throttle friction, check that the related components are all properly sealed preventing unwanted dirt and air migration. Check cylinder base gasket, check crank seals. Just some things to check but limited to everyything I said. There is always some hidden mechanical interference that is possible aswell.

Edited by rjg

Perhaps it the motor wasn't revving outside of its normal range.. maybe you could test ride a CT70??

 

JK these guys have covered it.  Air leak, throttle cable and assembly, carburetor.  Check it all out.

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