Backfiring 05?

[quadman21]

Ok guys, this may be a questioned asked often but a need some advice. I have on 05 TRX450R with a 178 main and a 50 pilot. I'm running an HMF slip-on with the queit core insert. A while back when I put the quiet core in (the hmf) I was having issues with throttle response. So after posting on here and getting some good responses I changed the pilot to from 48 to a 50, the main from 185 to 178, and played with my air/fuel screw.

All has been fine for some time now but it seems to backfire a lot on deceleration. Noticeably more so then usual. I need advice on whether I need to re-adjust the air/fuel screw or possible some other adjustment?

Thanks in advance!

[Scro]

Make sure you don't have any exhaust leaks. This will cause backfire.

[maticus]

how far out is your screw? and is it alot hotter or colder since you installed the jets and are you riding at a higher elevation. cause maybe it was right on the verge when you installed it and now its popping.

[cmmick]

check your hotstart cable.

[maticus]

or your valves need adjusted

[awj8074]

Originally posted by Scro
Make sure you don't have any exhaust leaks. This will cause backfire. i think this is my problem i have a leak where the full systems header and pipe connect the rubber is breaking apart and its leaking there. I plan on getting a DASA soon though so i'm not worried about it.