O.S #18640 – OS 91HZ-R MAX W/61E-R Carburettor

This is O.S. .91 HZ-R Helicopter Engine, Brand New in Box. Made in Japan

This is the new version O.S. .91HZ-R Helicopter Engine, with improved design
parts.

The Max 91HZ-R has been developed basing on the 91HZ designed expressly for
90 size helicoper models, equipping the new O.S. regulator system. The regulator
system ensures always steady fuel supply which is required for 3D flights which
require repeated vigorous attitude changes as well as for F3C flights which
require severe mixture control. With this system, fuel tank is pressurized by
pressure generatedin the crankcase. The fuel sent by pressure is regulated by
the regulator installed just before the carburetor, then sent into the engine.

The new 61E-R carburetor equips twin needles which enable to adjust idlling
/ hovering and high speed mixture independently.

Features:

• This is a main fuel tank pressurized regulator system integrated version
  of the 91HZ
• Newly designed 61E-R Carburetor integrated with a regulator surely regulates
  pressurized fuel. As with other 91HZ engines, it features twin needles which
  can adjust hovering and high speed flight independently Regulator is located
  at a place where heat does not suffer and access is easier
• The system ensures stable fuel supply irrespective of rapid model attitude
  and G changes
• The system does not use muffler pressurized fuel system which requires needle
  adjustment according to the change of muffler pressure

Includes:

• O.S. .91HZ-R Helicopter Engine with Pump, 61E-R Carb, #8 Glow Plug, Check
  Valve, Head Gasket 0.2mm, Needle Adjusting screw (M2.6*5 2 pcs) , English
  Instruction manual

Specs:

• Displacement: 0.912 cu in (14.95 cc)
• Bore: 1.091 in (27.7mm)
• Stroke: 0.976 in (24.8mm)
• Practical RPM: 2,000 – 16,000
• Power Output: 3.4 hp @ 15,000 RPM
• Weight: 625g