I got my Motomarina running really well today, new fuel line, rebuilt/cleaned the petcock, cleaned the carb, new NGK plug (w/ a resistor) & wire. Runs REALLY strong. However, it takes 5-8 tries to get it to start after shutting it down and turning the petcock off, after a 5-10mi ride. It kind of slowly sputters to life with a weak idle when it does finally start... any ideas? Its a Garelli V1 motor, pretty stock as far as I know.