BOSSIER_ROB
50cc
Tune it anyway. Factory tune is only so you can start it. Factory settings go out the window as soon as it leaves their building. Always tune a gas engine for peak performance and throttle transition. Even running it just a tad rich doesn't help anything but to build carbon. Tuning it correctly from the first run will help prevent stuck rings, carbon build up, fouled plugs and premature wear. Your plane will love you for it too. =)