back firing

[ebo 4356]

I have a 250ex and a yoshimura full system and rejetted also, the problem is that it back fires and i need to know if thats a problem or not. My old megamax did that too. So if anyone could me any suggestions that would help!!!!!!









-2003 Trx250Ex-
-Yoshimura full system
-Jet Kit
-Outerwear cover
-Uni air filter
-Works Shocks
-Fly racing Handlebars
-RAZR II rear tires
-DG V-pro front bumper
-DG alloy series rear bumper

[ZeroLogic]

You might be rich. My Sparks does the same also. It back fires when I let off the throttle.

[Sjorge450R]

if its doing de-acceloration, its your needle. That is adjusted too lean. Make the needle longer to make it rich so you have to move the clip up one spot. Then try that.