The first propane-powered outboard engines, LEHR 5hp motors present an environmentally-friendly and cost-effective alternative to gasoline.Overhead-valve four-stroke engines run on 110-octane propane, and are eco-friendly with zero evaporative emissions, because propane, unlike gasoline, is not listed as a marine pollutant by the DOT. Propane is 50-times cleaner than gas, with 96% less carcinogenic compounds, 60-70% less smog-producing hydrocarbons and no Class I or II ozone-depleting chemicals. Its also domestically produced, reducing our dependency on foreign oil. LEHR outboards are easy starting with no choke and no priming, reliable with no carburetor gum-up or winterizing, economical because propane costs roughly half as much as gas. Convenient Twist n Go fueling on 5hp model. Simply twist in a standard 16.4oz. propane canister and start your engine—no messy mixing or gasoline storage required. Or connect to a standard LPG tank with the provided 4' hose assembly for longer run times. Includes 4' propane fuel hose for remote tank. Suggested Tank Options Composite Tanks Standard Aluminum Tanks Specifications Engine Type: 4-stroke OHVHorsepower Rating: 5.0 hp (3.6 kW) Engine Displacement: 112cc Shaft Length: 15" Weight: 49.6lb. Fuel: Propane (LPG) Fuel Tank Type: 16.4oz. camping bottle” and/or remote tank (sold separately) Running Time: Throttle @ 5000rpm: approx. 1/2 hour; Throttle @ 3000rpm: approx. 1 hour 20 minutesFull Throttle RPM Range: 4500-5500 rpmStandard Prop: 7 1/2" x 7" Three blade aluminum Exhaust System: Above prop Ignition System: CDI Gearing: Forward, Neutral, Reverse Gear Ratio: 2.08:1 Warranty: Three years