Well i Don't have a air-box to my 1977 Motobecane And So i took a plastic box with a small hole and Rigged it to fit over the Air-box Section. Now tell me will this actually work? I can now start my moped without spraying gas into the carb, so that tells me I changed the amount of Air its getting. Now if anyone knows I can only see one Adjustment screw And would anyone know what IT should be At? I've played with it and I cant seem to get any change. Is there any other adjustments, i know the idle is adjusted at the throttle. I can only get this moped to do 15-20, is this normal? You have to put in The engine was completely seized with rust and it has no new parts except rings. It took me a week to free the engine and im sure its worn a bit.