i think even 20 cc domes run race gas not 100% postive on that but i think so. syncing does not require special tool.take airbox off look throug carbs slowly press accelortor watch the slides and the need to move at the exact same time there are adjustments on top of carbs to controll movement on slides just the slightest touch will make them move, they need to litrally need to move at the exact same time