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question on my 00 ktm 400exc

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i riding a yr 2000 exc 400. i fixed on a aftermarket header n midpipe wit a sx muffler which result it alot of backfired when i close my trottle at high rpm. what the problem? jetting? any advice?

and also i wanted to fix the 06 one pc tail plastic but understand that i must change the airbox and subframe. anyway to mod it on my old subframe?

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i riding a yr 2000 exc 400. i fixed on a aftermarket header n midpipe wit a sx muffler which result it alot of backfired when i close my trottle at high rpm. what the problem? jetting? any advice?

Usually, this is a symptom of the jetting being too lean. Go over and look at the jetting forum at KTMTalk Jetting for 2 and 4 stroke KTM's . Lots of good info there. :thumbsup:

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