The YS 91ST is the latest in helicopter engine technology from YS. It is a bored and stroked version of the popular YS 61ST-2 which has been optimized to provide the ultimate in reliable horsepower for your helicopter.
Specifications:
| Bore: | 27.7mm |
| Stroke: | 24.8mm |
| Displacement: | 14.95cc |
| Weight: | 540g |
| Practical rpm: | 2,000 ~17,000 |
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YS 91ST Helicopter Engine
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