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	YS ENGINES YS 91 ST4 HELI Extensive testing by YS factory team pilots has shown the engine to be the smoothest and most powerful heli engine available today. Ideal gear ratios for 3D flying are 8 to1 and F3C flying are about 7.5 to 1. The engine runs very well on fuels with lower than 30% nitro if you desire! Specifications: RPM Range: 2,500 to 15,000 RPM Weight: 19.2 oz. Our Price: $310.99 Added: 05 MAR 09 Quantity in Stock: 1 Product Code: YSE0059 Qty:

Description   YSE0059 YS ENGINES YS 91 ST4 HELI

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