18-23hp base model surface drive mud motor (with 500cc engine) walkthrough The 18-23hp base model surface drive is direct drive, meaning that the propeller is always spinning if the engine is running. There’s no neutral or reverse. This model fits either a short shaft transom (15-16”) or to transoms (18-21”) Kit weighs 100 pounds by itself and fits engines with 1 inch horizontal key crankshaft like the Mud-Skipper 18hp, 22hp and harbor freight 22hp V twin. Also Vanguard models with 1” horizontal key shaft This surface drive utilizes a 10 inch stainless steel propeller and is driven by synchronous belt Please check out more photos and information, please check the link in our bio #mudskippermudmotors #mudmotor #mudmotors #mudboat #mudboats