O.S. Engines GT15HZ Heli Engine Gas PowerBoost Pipe OSM38153
OSM38153 O.S. Engines GT15HZ Heli Engine Gas PowerBoost Pipe

O.S. Engines GT15HZ Heli Engine Gas PowerBoost Pipe OSM38153

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This is the O.S. Engines GT15HZ Gasoline Powered Helicopter Engine with a PowerBoost Pipe included.

  • Ideal for sport, 3D and scale pilots
  • O.S. Walbro developed pumper carburetor for consistent performance regardless of attitude, altitude, or fuel level
  • Polished aluminum PowerBoost pipe
  • Fits most .90 size helis with minor modifications
  • IG-05 ignition module designed specifically for helis and is compatible with a wide range of battery chemistries including NiCd, NiMH, LiPo and Life packs

One O.S. Engines GT15HZ Engine with CM-6 Spark Plug, IG-05 Ignition Module, PowerBoost Pipe and an Instruction Manual


Gasoline: Regular unleaded
2-Stroke Engine Oil
Ignition Battery: 4.8-8.4V NiCd, NiMH, 6.6V LiFe or 7.4V LiPo pack, at least 1500mAh
Displacement: 0.912 cu in (14.95cc)
Bore: 1.091" (27.7mm)
Stroke: 0.976" (24.8mm)
Practical RPM: 2,000 - 16,000
Output: 2.76hp @ 14,000 RPM
Engine Weight: 26.4oz (748g)
IG-05 Ignition Module Weight: 3.2oz (92g)
Power Boost Pipe Weight: 7oz (198g)
E-4051 Muffler Weight: 5oz (144g)
Gasoline/Oil Mix: 25:1
Distance/Mounting Hole Centers Same Side: 1.02" (26mm)
Distance/Mounting Hole Centers Opposite Side: 2.1" (53mm)
Height/Mounting Tab Bottom to top of Cylinder Head: 3.5" (88mm)
Height/Crankcase Bottom to top of Cylinder Head: 4.3" (109mm)
Width at Mounting Tabs: 2.4" (61mm)
Width of Crankcase below Mounting Tabs: 1.7" (42.5mm)
Distance between Exhaust Mounting Hole Centers: 1.6" (42mm)
Length from Center of Engine to Front Bearing: 2" (52mm)
Length from Backplate to Front Bearing: 3.14" (80mm)
Length from Center of Engine to end of Crankshaft: 3.5" (88mm)
Length from Backplate to end of Crankshaft: 4.75" (121mm)

Carburetor Adjustments

If engine responds sluggishly to increased RPM, turn slow needle right 5 degrees and advance throttle stick gradually. If engine hesitates before picking up speed, turn slow needle left 10 degrees to richen mixture.

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