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O.S. - OSMG1915 OSM38150 38150 531028022492 4531028022492
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O.S. GT15HZ Gas Helicopter w/o Muffler
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O.S. GT15HZ Gas Helicopter w/o Muffler
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Tech Notes
This is the O.S. Engines GT15HZ Gasoline Powered Helicopter Engine
without Muffler.


Ideal for sport, 3D and scale pilots
Fits most .90 size helis with minor modifications
O.S. Walbro developed pumper carburetor for consistent performance
regardless of attitude, altitude, or fuel level
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
Two year limited warranty through Hobby Services beginning at date of


O.S. Engines GT15HZ Engine with CM-6 Spark Plug, IG-05 Ignition
Module, two Servo Throttle Arms, and 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
Muffler: Depending on application


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
Weight: Engine, 26.4oz (748g)
IG-05 Ignition Module, 3.2oz (92g)
Power Boost Pipe, 7oz (198g)
E-4051 Muffler5oz (144g)
Carburetor Adjustments; If engine responds sluggishly to increased
RPM, turn slow needle right 5 and advance throttle stick gradually
If engine hesitates before picking up speed, turn slow needle left
10 to richen mixture
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)

jxs 01/16/13

– If you need more information, use these O.S. resources –
Click Here: Manufacturer's Product Web Page
Email: enginesupport@hobbico.com
Web Site: http://www.osengines.com/
Phone: 217-398-8970
  Postal Address:

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Accessories Needed
This is the O.S. Engines GT15HZ Gas Powered Heli Engine. FEATURES: Fits most .90 size helis, IG-05 module designed for helis, pumper carb for consistent performance, CM-6 spark plug REQUIRES: Unleaded gasoline, 2-stroke engine oil, ignition battery

Accessories for the O.S. GT15HZ Gas Helicopter w/o Muffler

Primary Accessories     Optional Accessories
  Special Stock Number Product Description Parts Saver Eligible Tower's
Low Price
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 LXS626 Klotz Gas RC Modelube 16 oz
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8.19   In Stock
Subtotal for this Group of Accessories: 8.19  

Primary Accessories     Optional Accessories

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