POWER ON DEMAND - FOR SERIOUS COMPETITORS!

Based on the celebrated, multi-time FAI World Champion 91HZ series, the O.S. 91HZ-R sets new standards for heli engines! Its specially designed "on demand" pressurized regulator system is mounted in line with the included 61E-R carb. Fuel is consistently delivered, regardless of attitude or throttle changes. The end result is an engine that performs equally well on a full or empty tank. Precise mixture controls - in the form of high- and mid-speed needle adjustment valves - help make it ideal for F3C flying. No matter the application, rest assured that the 91HZ-R will never lack in fuel - or performance!

• Pressurized, "on demand" fuel regulator system.
• Modified, two-needle 61E-R carb with high- and mid-speed needle adjustment valves and an idle control mixture screw.
• Performs equally well on a full or empty tank.
• Uncompromising design for superior power.

SPECIFICATIONS
Displacement: 0.91 cu in (14.95 cc)
Output: 3.4 hp @ 15,000 rpm
Practical RPM: 2,000-16,000
Weight: 22.1 oz (625 g)

Have a previous 91HZ model? Enjoy all the benefits the 91HZ-R has to offer with the easy-to-install Conversion Kit! It includes:

• 61E-R carburetor with pressurized regulator system, high- and mid-speed needle adjustment valves and an idle control mixture screw.
• Rear cover plate with pressure nipple and rubber O-ring seal.
• Check valve.

                                  Retail
OSMG1973 91HZ-R Heli Engine      $719.99
OSMG4039 91HZ-R Conversion Kit    329.99

Visit the O.S. Engines website at www.osengines.com

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