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backfiring problem

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i just recently bought a 2002 YZ426f from washington and bought it in California so i do not know where the bike came from :banghead: but now the bike is at sea level. The bikes problem is it backfires everytime the bike decelerates. All the jets are stock and the top end is brand new. So what jets should i change to stop the backfiring? Also i have played with the pilot screw and not much happened.

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