LEHR LP9.9S. LEHR PROPANE OUTBOARD WITH SHORT SHAFT. Lehr inc. has found a cost effective way, through the use of propane, to reduce emissions and associated health risks which will improve the marine environment all over the world. Propane is more efficient and cost effective than 87 octane gas. Great for sailboats, dinghies, tenders, fishing boats, pond prowlers, canoes and other small watercraft. Powerful 4-stroke engine uses 110 octane fuel but is eco-friendly and produces zero evaporative emissions. Easy, no choke start with no priming and no carburetor gum up. No winterizing! Runs on any size propane cylinders. 9.9hp operates in forward, neutral and reverse.