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2011 KX250F electrical

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Hey I am new to Thumper Talk I was wondering if anyone has had any problems with their 2011 KX250f backfiring under load? I have just did a top end rebuild weisco piston with new moose cyclinder valves are in spec bike runs strong but backfires under load and then stalls out after it is warm. I am starting to think it might be electrical maybe tps or stator I am waiting on manual to come in to start process of elimination just wondering if this year had problems with electrical any input would help thanks...

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Thanks for the fast reply! No I have not replaced fuel pump filter I will try cleaning the cdi pickup, spark plug is new. Have you heard of this issue or any known issues with the 2011 kx250f

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Other than the forks being stiffer than a Viagra side effect, no. There's nothing wrong with the '11. You could also have an exhaust leak as well. The gasket at the slip-on/header joint could be worn or the header might not be fully seated into the cylinder head.

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I appreciate the input I just replaced the exhaust with Yoshimura RS-4 full system. The manual arrived yesterday so I will be getting to it this weekend I will update with what I find. I checked the spark plug that the shop I previously had it said they replaced and it looks fouled probably from the low compression before rebuild. Put new plug in seems to run fine for now I will feel really dumb if thats all it was but I will be checking the whole electrical system anyways to see if something is causing the plug to foul and run like crap.

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