J&P Community

 I have a 2004  Sporster 1200 Roadster.  I recently installed Vance and Hines slip on mufflers and a K&N air cleaner.  Sounds awesome and has improved acceleration.  I am getting some back fire when I get off the throttle (decellerate).  I took the ham can off the air intake to see if more air would help, it did not seem to make a differance.   I am sure this is probably a common thing.  Anybody dealing with have the answer??  Thanks

 you more then likly need to rejet the carb. Look at P# 4000294

 sounds like the carb may be loading up & may need to be rejetted

Reel,

 It's not 'loading' up, it's running too lean.........................try the next size bigger mid jet.

 Thanks / changed slow jet to next size up.  Now I only get a little back fire once in a while / runnin much better /   I may go up one one more size on the slow jet /  Thanks for the help!!

How are your plugs burning (whitish? Tan? Blackish?)?  they will tell you if you need to go up one more or not