backfiring and stalling on decel

[bill1960]

DRZ400s

Mikuni flat slide pumper

Fuel screw 2.5 turns out

27.5 pilot jet

FMF powercore exhaust

Bike starts and idles OK and accellerates OK

Backfires on decel and sometimes engine cuts out

Cleaned carb, changed fuel, checked tank petcock filters

Higher idle speed improved things slightly.

If not a fuel problem, could ignition problem cause similar symptoms

[Wayward Son]

needs a bigger pilot jet

[bill1960]

Is the NGK CR8E GP platinum sparkplug a good one for the DRZ400S ?

[Wayward Son]

yes,it fine.