S40 Suzuki backfire

Suzuki Boulevard S40 discussion forum:


S40 Suzuki backfire

S40 Suzuki backfire 
Walt B. said 2010-04-14 18:14 
 
I just upped the carb needle 1 step up.Increased jet to 147.5. Bike has jardine muffler when purchased-still backfires-am going to try a Harley sportser muffler Any advice would be appreciated 
 
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