When it comes to gasoline aircraft engines, the GT-33 is in a class of its own. It has the muscle to swing larger props, and it stands out for many other reasons, too. The GT-33 offers incredibly fast throttle response, with 10 more power than comparable engines, and it starts easily with electronic ignition that accepts many battery types. Once again O.S. has produced a gas powerhouse for the serious pilot!br br Learn more about the O.S. GT-33 Gasoline Engine by visiting its product page at br OSMG1533br Displacement: 2.013 cu in (32.98 cc)br Bore: 1.417 in (35.99 mm)br Stroke: 1.276 in (32.41 mm)br RPM range: 1,800-8,000br Total Weight: 43.39 oz (1230 g)br Includes: E-5030 muffler, ignition module, CM-6 spark plugbr br Join O.S. on Facebook! Go to to interact with O.S. product experts and modelers like you.