alright i have an rm125 thats been being difficult and i think i figured out the reson. i have been playing with stock jetting on a carb that i just found out is wayyyyyyyyy aftermarket. my bike called for a keihin pwk36 from the factory. granted its now got a full pipe uni boyesen reeds and a hotrods crank but i just found the cark is a pwk43d30. i take it that it is 7mm oversized? but does anyone know of this carb or where to even find one? i checked up and down online and found nothing no specs no design nothing. anyone have any idea what it is?