I ran a PJ bored to 39.5 for 20 years ( set up by ct racing) It always started right up and ran crisp but i felt it just didnt flow eough. based on feed back from this site I went to modded mikuni--more Qx dune port and Q pipe. I cant cant compare the carbs because its just a bare frame now. but the kehien PJ carb performed very very well,