O.S. GT22 Gas

Tower Stock# LXCNMC  •  Manufacturer Stock# 38200
O.S. GT22 Gas (large view)
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Notes from our tech department:
This is the OS Engines GT22 Gasoline Powered Engine with Muffler
and Rear Mounted Carburetor.


Beam mounting design allows engine to fit inside cowls that are
sized for 2-stroke .60-.91 and 4-stroke 1.20 glow engines
Custom designed rear mounted Walbro carburetor with choke rod guide
integrated into crankcase that minimizes set-up time
IG-02 electronic ignition handles 4-6 cell NiCd, NiMH or 2-cell LiPo
and LiFe batteries
Pitts style muffler has reinforced mounting bolt holes and webbing at
high stress points
Two year limited warranty through Hobby Services beginning at date of


GT22 Engine with Muffler, Electronic Ignition Module, CM-6 Spark Plug
Muffler Gasket, Muffler Bolts and Instruction Manual


2-cycle oil with a mix ratio of 50:1 if using Klotz model oil
(if using other brand, follow manufacturer's mix ratio or if no
recommendation, mix at 30:1)
Ignition Battery: 4-6 cell NiCd, NiMH, or 2-cell LiPo
LiPo battery requires voltage regulator
Propeller: 16x8, 16x10, 17x6, 17x8, 15x10 for break-in
Gasoline safe fuel tubing and fuel filter


Displacement: 1.35 cu in (22 cc)
Bore: 1.26" (32mm)
Stroke: 1.08" (27.5mm)
Practical RPM Range: 1,800 - 9,000
Output: 2.66 hp @ 9,000 RPM
Engine: 26.86oz (761.6g)
Muffler: 4.68oz (132.6g)
Ignition Module: 3.7oz (105g)
Initial Needle Positions: High Speed Needle-two turns open
Low Speed Needle-one and a half turns open
Distance Between Mounting Hole Centers Same Side: 0.98" (25mm)
Distance Between Mounting Hole Centers Opposite Side: 2.2" (57mm)
Mounting Hole Diameter: 0.197" (5mm)
Length of Muffler Can: 3.9" (100mm)
Width at Mounting Tabs: 2.7" (70mm)
Width of Crankcase Below Mounting Tabs: 1.9" (49.4mm)
Height from Crankshaft Center/top of Cylinder Head: 3.7" (94mm)
Height from Crankshaft Center/Muffler Mounting Hole Centers: (48.4mm)
Length from Drive Hub to Carburetor: 5.5" (139.5mm)
Length from Drive Hub to Center of Crankcase: 2.7" (68.5mm)
Length from Center of Crankcase to Carburetor: 2.8" (71mm)
Crankshaft Size: 5/16-24 UNF-2A

jxs 10/11/12

jxs 10/11/12

See Tower Catalog page 173.
Easy RC: Engines
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