O.S.Speed 91HZ-R & Powertune Pipe Combo

O.S.Speed 91HZ-R & Powertune Pipe Combo

$649.99 $849.98
Coming Soon
SKU: OS-18642-GPH-MS-250

Here at BK Hobbies, we've put this combo together. This is one the most proven, reliable and powerful setups on the market. It includes an O.S. Speed 91HZ-R engine and a Powertune muffler that was specifically designed to work with this engine.

OS Engine

Features:

  • Lightweight, machined heat sink head
  • Big-bore carburettors best-suited for the intended use (F3C or 3D)
  • Best precision advanced exhaust cylinder timing (for F3C or 3D)
  • Newly designed combustion chambers, shaped to match the big bore carburetors and advanced exhaust cylinder timing
  • Lightweight, forged steel crankshaft counter weight to lower vibration for higher speeds
  • Improved back plate shape, to accommodate Futaba's BPS-1 RPM Sensor and increase primary pressure for greater stability
  • The cover plate has a cell to accept a sensor designed to install in the cover plate from Futaba GY701 / CGY750 Governor

Technical Specifications:

  • Displacement: 14.95cc
  • Bore: 27.7mm
  • Stroke: 24.8mm
  • Output: 3.6ps/15,500RPM
  • Practical RPM Range: 2,000-16,500
  • Weight: 603g

Package Includes:

  • Engine Pack O.S. Speed Tuned .91HZ-R Helicopter Engine with Pump, 61G Carb
  • #8 Glow Plug
  • Check Valve
  • Head Gasket 0.2mm
  • OS Speed Decal and English Instruction Manual

Powertune Pipe

Features:

  • The power of Hatori without the weight or complexity
  • The lightest aftermarket muffler available for the OS Max 1.05 at 235 gms
  • Header opening matches exhaust port size
  • Includes mounting accessories
  • Tested by pro pilots