sputter sputter

my bike sputters when i'm deaccelerating, does that mean it's rich or lean and would that be the pilot jet or the needle?

[spliffy]

To Rich More Than Likely (Main Jet)... Or You have An Exhaust Leak Maybe Too.

why would the main affect my jetting at 0 throttle though was all i was thinking?

[Wheelie]

Is it a sputter or a backfire/pop? Does it idle fine? How is the throttle response from 0-3/4 and 3/4 to WOT?

Mods?

[Rastus]

Mine kind of backfires and pops almost all the time decelerating. Some days its worse than others.Thats jsut because the diffrence in the air, but, am i lean, or rich?