OS Engine GF-40R w/F-6040 silencerIdeal for aerobatic or scale aircraft, the 4 stroke GF40R offers excellent torque and a realistic sound, plus fuel economy and the fit and finish that O. S. is famous for. This version has been optimised for UAV use, so has a more durable exhaust valve seat and ballraced rocker arms for reduced wear and increased durability. Other features include a Walbro carburettor and an integrated choke rod guide that simplifies the installation. The GF40R
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