I have a 1980 Garelli VIP 2speed. It runs drives great but the only problem is its a pain in the ass to start. Normally I have to pedal like mad down a hill or my driveway to get it to run and it will run slow for like half a block before it kicks in. I recently accidentally left my petcock on over night and the next day it turned over in one kick, which it has never done before, after that it ran better than ever. My petcock and fuel lines are all brand new and they get good fuel flow so why do I have to leave it on for several hours in order for an easy start? I don't want to flood my engine by leaving the petcock on all the time so what could I do to fix this?