O.S. GT15 Gas

Tower Stock# LXDUWC  •  Manufacturer Stock# 38160
O.S. GT15 Gas (large view)
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Notes from our tech department:
This is the O.S. GT15 Gasoline Engine with the E-4040 Muffler.


IG-06 electronic ignition handles 4-6 cell NiCd, NiMH or 2-cell LiPo
and LiFe batteries
Beam mounting design allows engine to fit inside cowls that are
sized for 2-stroke .60-.91 and 4-stroke .90 glow engines
Two year limited warranty through Hobby Services beginning at date
of purchase


GT15 Gasoline Engine with E4040 Muffler, IG-06 Ignition Module
CM6 Spark Plug, 61H Carburetor, and Instruction Manual


2-cycle oil, see SPECS
Gasoline: Regular, no need to use high octane gasoline
Ignition Battery: 4.8-8.4V NiCd or NiMH, 6.6V LiFe or 2S 7.4V LiPo
pack, LiPo battery requires voltage regulator
Propeller: 13x8-11, 14x8-10, 15x8
Electric Starter
Gasoline safe fuel tubing and fuel filter


Displacement: 0.912 cu in (14.95cc)
Bore: 1.091" (27.7mm)
Stroke: 0.976" (24.8mm)
Practical RPM: 2,000-15,000 RPM
Weight: 22.26oz (631g) engine
6.28oz (178g) muffler
3.35oz (95g) ignition module
Gasoline/Oil Mixture: 30:1 - 50:1
25:1 fuel/oil mixture if brand of oil states 50:1 mix
Carburetor Settings;
Needle Valve: With engine running, close needle valve as RPM
increases, close further 60-90 from point where RPM starts to
decrease, open slowly as RPM increases, then open 90 further
from maximum RPM point
Mixture Control Valve; Open one turn, open and close throttle a few
times to make sure there is no resistance, close mixture control
valve 30, repeat open and closing of throttle then open mixture
control valve approximately 90
Width at Mounting Tabs: 2.4" (61mm)
Width of Crankcase below Mounting Tabs: 1.7" (44mm)
Length between Mounting Hole Centers: 0.98" (25mm)
Crankshaft Size: UNF 5/16-24
Muffler Mounting Angle from center of Engine: 4
Needle Valve Mounting Angle from center of Engine: 30
Length from Pump to Drive Hub: 4.2" (106.2mm)
Length from Pump to end of Crankshaft: 5.6" (142mm)
Length from Pump to center of Crankcase: 1.5" (39.4mm)
Length from Drive Hub to end of Crankshaft: 1.4" (35.8mm)
Length/center of engine/opposite side of Muffler: 4.1" (103.3mm)
Length/center of engine to side of Cylinder Head: 0.96" (24.3mm)
Length between Muffler Mounting Hole Centers: 1.6" (42mm)
Length from Crankshaft Center to Muffler Outlet: 4.4" (112.3mm)


For an engine mount order OSMG2780.
jxs 11/05/13

See Tower Catalog page 173.
Easy RC: Engines
Review #1
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