O.S. MAX-91HZ-PS 3D Ringed 61B-PII w/Pump 2-Stroke Engine for 3D Helicopter
The 91HZ Ringed Heli Engine is a major player at heli competitions worldwide, and this newest version takes 3D performance to another level!
- The redesigned regulator is positioned horizontally, working with the PD-08 fuel pump it delivers a steady supply of fuel regardless of the helicopters attitude or demand on the engine.
- The piston and crankshaft are designed to reduce vibration and improve torque over the entire rpm range.
- The narrow profile of the heat sink head helps the 91HZ fit completely inside cooling shrouds without cutting or losing cooling power,and a thermo insulator on the 61B-PII carburetor blocks engine heat to ensure a stable fuel/air mix.
- Includes in-flight needle value adjustment arm.
With back-to-back FAI world championships in 2005 and 2007, the 91SZ-H was a winner by anyone's standards. Now there's the 91HZ – a 91SZ-H redesigned with the help and advice of the world's top pilots. It offers the tuning ease and performance consistency of the multi-time world champion and design innovations that promote improved cooling, a tighter compression seal – and tuning ease!
Package Included:
O.S. Max 91 HZ-PS Ringed Helicopter Engine
GLOW PLUG NO.8
Instruction Manual
Specifications:
Displacement: 0.91 cu in (14.95 cc)
Bore: 1.09 in (27.7mm)
Stroke: 0.98 in (24.8mm)
Practical RPM: 2,000 - 16,000
Power Output: 3.4 hp @ 15,000 RPM
Weight: 1.4 lb (635g)
Includes: 61B-PII carburetor, #8 glow plug
Code No. 18621
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Special CNY Pak 2012! 
