Excessive backfire?

Yamaha XV 750 discussion forum:


Excessive backfire?

Excessive backfire? 
NN said 2003-08-19 04:46 
 
I just installed a set of Hard Krome slash cut slip-ons on my 93 Virago. It starts as easy as ever and runs stronger at low end and top end. The midrange appears a little weaker. I have what appears to me as excessive backfire every time I deaccellerate. Is this normal? After running well over 300 miles my pipes are still showing very little black at the exhaust ends. Am I running too lean? If so would enriching the mixture help the backfire problem? FK 
 
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