i recently got my bike for $1300 not running because the carbs were clogged.. cleaned them out myself n got it running. now when i ride i notice alot of minor backfire when riding the rpms down. and there are good 6 inch flames if i tack out my bike for just a second.. im wonderin if its bad or is it just the exhaust... the only 'mods' i got are a k&n air filter nd a 2 brothers exhaust which is cut, so its like half the length.

 

Running lean, need to change jetting

 

wouldn't hurt to change the plugs

 

would it hurt to keep riding as it is?

 

It wouldn't hurt to have it fixed

(Yes lean conditions can lead to valve damage in extreme conditions, runs much hotter)