hi ive just bought some gsxr 600 k4 throttle bodies. but theres two sets of butterflys in them one set about 30mm the other about 40mm.does it matter what set you use and do you no why there is two sets
adam

one set is controlled by the ecu via stepper motor, the other by the cable.

the ones that were controlled by the stepper motor(closest to filter i think) need removing and the holes blanking

Ray

ive just finished taking them apart but the bodies are two units. do you have to fill the inner holes as there joined to each bodie wil it act as a balance pipe