It's on the 3/4" side between the jar and the engine. I'm not sure what I'm going to do about the jar yet! 1/4" ended up not being enough for the engine, so i got a large mouth jar and drilled 2 1 1/8" holes for the 3/4" pipes. All i need now is a cable to the ball valve and i can take it on the road to test it's fuel usage and if it runs smoothly or not. So far it's been really easy to adjust the idle speed and rev the motor in the driveway but i'm not sure of it's power yet. It is a 150cc
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