Start Your Engines! fuel system revitalizer is designed to ensure easy starting of 2-cycle and 4-cycle motors, smooth rough idling and stalling, and helps remove gum and varnish from throttle plate and carburetor. Easy-to-use - just add to the unit's fuel tank. Perfect fuel additive for snowmobiles, snow blowers/throwers, lawnmowers, string trimmers, power blowers, chainsaws, ATVs, motorcycles, generators, outboard motors, personal watercraft, tiller cultivators, edgers, hedge clippers.