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!

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