OS Engines O.S. FS-64V (61T2) with F-4051 Silencer
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    Detail  Increased StokeBy increasing the stroke, not only propellers of 12x7-8 and 13x6 sizes, but also propellers with large loads (13x7-8, 14x6) can be used without any loss of power.   Cylinder DesignA newly designed cylinder head is adopted along with the increased displacement. The internal capacity of the combustion chamber has been expanded to achieve more realistic 4-stroke exhaust sound and more power.   F-4051 SilencerThe F-4051 silencer, which is a unique design of the FS-V series, has revised the internal dimensions and improved the exhaust efficiency while maintaining the comfortable 4-stroke sound.   Drive WasherThe drive washer has been changed to a machined aluminum with a woodruff key. Additional standard equipment is set if lock nuts that prevents the propeller from coming off. Product SpecsBore0.984" (25 mm) Displacement10.46cc/0.638cu.in Prop Rangesport/Stunt : 12×6-8,13×6-7 Scale : 14×6 RPM Range2,400~11,000r.p.m. Stroke21.3mm/0.839in. 
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