Six 1/4″ mounting holes 7″ overall diameter Perfect for the Tomberlin Firehawk 6.0 HP mini bike Our recoil pull start is compatible with the Mitsubishi GT600 6.0 hp engine The Mitsubishi GT600 engine was used on several mini bike models, including the Tomberlin Firehawk Our recoil pull start is compatible with the Mitsubishi GT600 6.0 hp engine. The Mitsubishi GT600 engine was used on several mini bike models, including the Tomberlin Firehawk. Pull starts are a common gas engine replacement item. Used in dusty and dirty environments can cause clogged engine air filters and fouled spark plugs. When you factor in the poorly adjusted carburetors on most Chinese made gas engines, all of these conditions can make for an engine that is difficult to start. You can extend your pull start life by keeping your engine in good working order. Diameter: 7″ Mounting holes: 6 Mounting hole diameter: 1/4″ Mounting hole distance (side by side): 3-1/4″ Mounting hole distance (across):