A simple question

[atctim]

My 350X has a cobra exhaust (head pipe, pipe, and muffler.) It back fires really bad when slowing down using compression or just letting off the gas anytime. Last night I could actually see blue flames shooting out of the muffler about 12 inches. I don't like this. Could it be that the owner before me put the new exhaust on and didn't re-jet??? What jet should I use?? What jet comes stock??? Any help would be great.

Thanks,

ATCTim

[42F67N]

I dunno the jet sizes for your trike but i do know i installed a cobra pipe on my atc 70 and it was jetted rich and i blew blue flames out the pipe the same way.

[rob0781]

my cobra causing my trike to run rich i haven't seen flame tho....on my old 110 i had that thing was shootin some nice flames..

[sittinguy]

you need to check the jetting ASAP,, But you probably just need to repack the pipe it sounds like you have to little back pressure. 350X's all need a little back pressure to run good. Stock jetting is 135, I think and you will probably want to try a 142. I run that on my go girl, and I run a 152 on the highly modded show girl.
good luck