Honda TRX 400ex backfiring on decel November 5, 2015 I just insalled a new lonestar exhaust. I installed a 160 main 42 pilot. I noticed on deceleration there is a little bit of backfiring. Its not too bad, just trying to solve this issue. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related