Thread: backfire
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Old 12-13-2012, 07:01 PM   #2
smallblock450sl's Avatar
Join Date: Oct 2007
Location: Tacoma Washington
Posts: 11,577
Default Re: backfire

Originally Posted by colarue View Post
I have a 2009 gas yamaha, whe I let off the gas it backfires. What is the problem/
I've seen a couple of things that cause them to back fire. #1-accelerator cable #2 (from govenor to carb throttle shaft) to tight, not alowing the throttle shaft to close all the way. #2- the muffler header pipe (at the cylinder head flange or were the header tube is welded at the muffler) are damaged. #3- the 2 12mm nuts that hold the air cleaner box and carb are loose.
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