sirThej (guest) View all posts in this topic  
Thu Aug 25, 2005 3:41 am
I'm no expert but I found an interesting link:        

Not exactly aimed towards our motorcycle, but it could provide a hint as to the problem:

"A bad vacuum leak can lean out the mixture enough to cause an engine backfire." (Backfiring section)

Rough Idle section also mentions a possible cause being low vacuum.

Seems to fit with Duke's bike's symptoms.

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