pw80 stammerer ???

[tsvikac]

what can be the cause?
the bike starts easily
it stayes in idle ok.
when you ramp the gas it running ok but when the bike is in high
rpm the engine stammerer .

[EJSDAD]

loosen exhaust from head and take out restricter
looks like a big washer with a little hole in center
taht should cure your stammer ;D