It's the chain saw the G62 was made from...3.7 cubic inches, 62cc.magnesium alloy crankcase..A converted 7700 weighs about 4 lbs with CD ignition, uses the same cylinder and piston as the early G62..The airplane G62 has a slightly larger crankshaft, different crankcases, different magneto, and a different carb..GREAT engine.....