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Hey guys how's it going. I've got a 2001 xr 650r . It's great when I keep up at high rpms but when I'm going downhill or down shift it keeps back firing. I've cleaned out the carb and couldn't find anything wrong with it. Any suggestions?

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Mine pops and bangs on over rev while coasting with no throttle ,I think it's quite normal ? My bike runs great and it does it,it does have a aftermarket end can on mine if that makes a difference ?? 

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