I recently bought a supertrapp mudslinger exhaust and a power chip for my 2006 750 Brute Force. When I hit the throttle there is no hesitation but when I let off it backfires somewhat. Can someone please let me know if I need to rejet the carbs or make any adjustments for fuel on the carbs at all? Thanks for your help. Brian

 

Yep! You sure do. You're not getting the power you deserve for the power chip and exhaust. If you take the quad to the shop, they'll re-jet it plus all the other stuff that needs to be replaced. If you've done everything you said, it sounds like your metering rods.

 

get it rejeted as soon as possible bro, don't keep running it that way, you could burn a valve or cause other engine damage

 

Quote from http://www.supertrapp.com/resource/faqs.asp#20


Q. Why do some aftermarket pipes backfire when you decelerate?
Backfire, or "lean misfire" on deceleration is primarily attributed to an improperly tuned engine. Under this circumstance, the low speed fuel circuit needs to be adjusted. On a street bike, the rule of thumb is to adjust the fuel mixture screw out in ½ turn increments to add fuel. If you reach 3.5 turns out and it still pops on decel then go up one size on the pilot jet and turn the fuel mixture screw back to one turn out from bottomed. Repeat this process until the misfire is eliminated. In some cases, this problem is an indication that the exhaust is too free flowing (i.e. Head pipes too large in diameter or muffler core is too large) for the motor configuration you have. As always, check your spark plugs to verify the tune is correct. The plugs should be a light tan in color if tuned properly. If the exhaust is too "free flowing" you will ultimately add too much fuel which will cause an excessively rich condition and foul the plugs.

 

Thanks so much for your reply. I will not run it again till I get it checked out