backfire?

[cowboy5]

hello

what causes the backfiring noise, not really a backfire but more of a popping noise, sounds kinda cool but cant be good for the bike. sounds like small fire crakers

[randy]

Steve,

Some things that can cause backfire:

-installing aftermarket exhaust without re-jetting the carbs, causing lean condition.

-carbs out of adjustment, causing lean condition

-holes in exhaust system

-loose exhaust flange bolts

[prometheus578]

"Backfiring is caused by once having too much oil in the engine."

(Oh, I couldn't resist that one)
Randy has all the correct answers for you.