Arnold wrote on 09/09/10 at 08:35:39:But isnt backfiring directly related to lean mixture?
Yes it is, but that doesn't mean that its wrong. Suzuki does NOT guarantee to stop the backfiring on a brand new bike. Yes, part of the reason is because they are under epa regs. But, by design, these engines are known for some backfiring. Sure, some here hack the carb till it doesn't BF as much, but it will still do it under the right conditions. And those are some of the same people that complain of running rich, and have to change the s plug often, and wonder why.
If you haven't had to touch the s plug in 6,000 miles, something tells me its running perdy good