04 backfiring

[ryan137]

I have an 04 trx450r. It has an hmf slip on and k+n airfilter with no lid. I have a 180 main and 50 pilot. When im riding i get some backfiring when i get on it. Not sure why was hoping for some help

[maticus]

jets sound alittle big but that depends on where you're located im using a porcircuit slip on and way open box and im using 175 50. but the main thing is to mes with the a/f screw. but thats usually on take off and decel so if its popping while your giving it gas they it may be something different.

[ryan137]

im not getting any popping on acceleration just when i let off. ill try ajusting the screw see how it works

[Scro]

Make sure you don't have any exhaust leaks.

[hondaracing_13]

I have a 04 with a White Brothers E2 and it pops when I let off the gas and I had to mess with the A/F screw.

[liljhall09]

I have the same problem still letting off the gas, its jetted and has a new exhaust ring or w.e it is , i think its my valves ?

[Scro]

Also, if the fuel screw hasn't been turned out any, 2.5 turns out would be a good starting point.