. The first propane-powered outboard engines, LEHR 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. Connect to a standard LPG tank with the provided 4' hose assembly for longer run times.15hp models are complete with a 10' hose assembly and connect only to a Lehr liquid draw propane tank. Liquid draw propane tanks are sold separately. Suggested Tank Options Composite Tanks Standard Aluminum Tanks Specifications Engine Type: 4-stroke OHV Horsepower Rating: 15hp Cylinders: 2 Engine Displacement: 323cc Shaft Length:20" Weight: 126lb. Fuel: Propane (LPG) Fuel Tank Type: Remote tank (sold separately) Carburetion: No choke/ No priming Exhaust System: Through prop Ignition System: CDI Start: ManualSteering: Tiller Gearing: Forward, Neutral, Reverse Gear Ratio: 2.08:1 Warranty: Three years LEHR 15 Owner's Manual