Question about 2005 Suzuki Boulevard C90
Backfiring means you have an air leak or a lean mixture. Look for leaks at the header pipes or perhaps a crack in the exhaust.
Cold air getting into the exhaust is usually what causes the backfire noise.
You may have a lean engine running situation but the bike would have other issues besides the backfire.
Let me know if you are having any other issues or if it just the backfire.
Posted on Jan 02, 2009
The popping sound is indicative of the Suzuki C90 line. To minimize the popping noises, perform the pair valve removal and switch to NGK Iridium spark plugs. Also, look into a Stage III kit for your bike and find a fuel map that best suits your needs. It won't eliminate all of the popping, but it will get rid of about 95% of it.
Posted on Jun 23, 2012
I have a C90T with all the same specs and even with the Bully you can get some backfiring. The only way I was almost totally able to stop the back firing is to complete the pair value modification (block or remove). Google 'Mocc's place'. He has detailed instructions on how to complete the mod. Very easy and makes all the difference in the world (even if you do not have the bully or pipe mods).
Posted on Apr 12, 2011
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