I needed to re-jet my 00 YZ 426. It was backfiring at the bottom end of the deceleration cycle. Say i rev it out to the rev limiter in 1st gear than close the throttle, at the very last 1000 RPM or so it starts going poppoppoppop. Not a loud gun fire backfire but a constant one. I richened out the "jet needle" (not main jet) and it stopped a little but not enough. My spark plug is within range as far as coloring goes, so it's not running lean/rich at mid-full throttle. What's the best next move? Should i richen out the pilot screw a couple of turns? Should i richen out the main jet needle? Should i richen out the jet needle one more position? Only experienced peeps reply plz?