Bigger pilot jet.you need more fuel at higher altitude.i would say they only changed the Main jet.you might try backing out the air screw.if that wont straiten it out.bigger pilot.
No, you need a smaller jet at higher altitude. There's less air at higher altitudes, so you need less fuel to keep the air/fuel mixture where it needs to be.Bigger pilot jet.you need more fuel at higher altitude.i would say they only changed the Main jet.you might try backing out the air screw.if that wont straiten it out.bigger pilot.