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Discussion Starter #1
I have a 1997 xr100r and i got fmf for it and it has a crackling noice when I'm going fast and then when I let off the throttle it backfires, are the jets too small?
 

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The exhaust is probably leaking either at the head or the muffler joint or from a hole or a crack in the exhaust somewhere. You'll need to fix any leaks completely before you attempt to rejet it.
 
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