popping from my atv

[mustang25]

i have a 2006 trx250ex.....it has an fmf megamax exhaust and a k&n airfilter, for about a week now it has been making a popping noise from the exhaust everytime i let off of the gas......any1 know what this is?:confused:

[rooster300ex]

prolly lean jetting.

[Mx_523]

Did you change the jetting when you put on the air filter and pipe? If not, your to lean.

[RiderTRX400ex]

lean pilot jet, you might be able to adjust it out with the fuel mixture screw.. and yes, you will need to rejet to get maximum gain from your mod.. you wont regret it in the long run