Fits Hammerhead UM150IIR.  This is for the engine with or without cooler holes -- it includes a bypass for karts without the oil cooler & filter behind the driver's seat.  Engine only -- does not include carb, air filter, or reverse assy.

NOTE:  This is a special order item.  Your credit card will be charged prior to our ordering the engine.  Contact us for details.  This is a copy of the Honda GY6.