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91SX-H Ring


Beating the competition — again!

O.S. engineering comes through again, in an updated version of our popular .91-size ringed heli power plant!

  • Features new intake porting, new carb — AND a redesigned crankcase that offers better support for the crank and thrust bearings.

  • This engine powered the 1st, 2nd and 3rd place finishers at the 2005 World Championships in Spain!

osmg1983

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SPECIFICATIONS
Stock Number: OSMG1983
Displacement: 0.91 cu in (15cc)
Bore: 1.02 in (25.8mm)
Stroke: 0.87 in (22.0mm)
Practical rpm: 2,000-16,000
Output: 3.3 hp @ 15,000 rpm
Weight w/o muffler: 21.3 oz (605 g)
Includes: #8 glow plug
18300 91SX-H Ringed Special Competition w/Pump Parts Listing


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