O.S. GT33 Gas Engine

Tower Stock# OSMG1533  •  Manufacturer Stock# 38300
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Notes from our tech department:
This is the GT33 Gasoline Aircraft Engine with Muffler and Rear Carburetor
from O.S. Engines.


Electronic ignition accepts LiFe, LiPo, NiCd and NiMH power and also
offers low voltage warning
Rear mounted Walbro carburetor-NOTE the choke valve rod shown on
page 12 of the manual is not included
Pitts style E-5030 aluminum muffler black in color, 5dB lower in
noise than the competition
Two year limited warranty through Hobby Services beginning at date of


GT33 Gasoline Aircraft Engine with Muffler, Carburetor, CM-6 Spark
Plug and Instruction Manual


2-cycle oil, see SPECS
Ignition Battery: 4.8-6.0V NiCd or NiMH, 6.6V LiFe or 7.4V LiPo pack
LiPo battery requires voltage regulator
Propeller: 18x10-12, 19x10, 20x8-10, use 18x8 prop for break-in
Mounting standoffs, length depends on aircraft
Gasoline safe fuel tubing and fuel filter


Displacement: 2.013 cu in (32.98cc)
Bore: 1.417 (36mm)
Stroke: 1.276 (32.4mm)
Crankshaft thread size: 516-24
Total Weight: 2.7lbs (1230g)
Engine, 34.72oz (984g)
Muffler, 5.65oz (160.5g)
Ignition: 3.70oz (105.0g)
RPM Range: 1,800 - 8,000
Output: 3.9 PS, 3.85 HP9,000rpm
GasolineOil Mixture: 30:1 - 50:1
25:1 fueloil mixture if brand of oil states 50:1 mix
Replacement Spark Plug: NGK CM-6 or Denso U20M-U (.020 gap)
Height, Crankshaft Center to Exhaust Outlet: 6.1 (156.1mm)
Height, Crankshaft Center to Muffler Body: 4.1 (105.4mm)
Height, Crankshaft Center to Muffler Mounting Holes: 2.1 (54.4mm)
Height, Crankshaft Center to top of Cylinder Head: 4.3 (109.2mm)
Length, end of Crankshaft to Carb: 7.7 (196.6mm)
Length, end of Crankshaft to Backplate: 6.2 (158.9mm)
Length, end of Crankshaft to Center of Engine: 4.9 (125mm)
Length, Prop Washer to Center of Engine: 3.3 (84.5mm)
Length, Prop Washer to Carburetor: 6.1 (156.2mm)
Length, Prop Washer to Backplate: 4.7 (118.5mm)
Width, Muffler Body: 4.5 (114mm)
Width, Crankshaft Center to Exhaust Outlet: 1.2 (31.5mm)
Cylinder Head Diameter, front to back: 2.5 (62.8mm)
Cylinder Head Diameter, side to side: 2.6 (66mm)
Mounting Hole Centers top to bottom: 2.1 (54mm)
Mounting Hole Centers side to side: 3 (76mm)

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