O.S. GT60 Gasoline Engine

Tower Stock# LXCVPW  •  Manufacturer Stock# 38608
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Notes from our tech department:
This is the O.S. GT60 Gasoline Large Scale Airplane Engine without Muffler.


Linerless cylinder with the cylinder head integrated with the
cylinder, this arrangement allows for extremely precise intake/
exhaust timing and very high scavenging efficiency resulting in
higher output
IG-02 electronic ignition system can be powered by 4-6 cell NiCd/
NiMH batteries or 2-cell LiPo batteries
Custom designed Walbro carburetor mounted to rear of engine with
integrated choke rod guide
Two year limited warranty through Hobby Services beginning at date
of purchase


O.S. GT60 Gasoline Engine, IG-02 Electronic Ignition, Instruction
Manual, and CM6 Spark Plug


Two-Cycle Oil: Break-In, Klotz Modelube recommended, mix at 30:1
gas/oil mixture for 10 flights, 1.3 - 1.6 gallons (5-6 liters) of
After Break-In: mix at 50:1 ratio, See COMMENTS below
Propeller: 23x8 for break-in, 22x10-12, 23x8-10, 24x8-10 for
Acro/Scale models
Muffler: See COMMENTS below
Electric starter NOTE, The propeller must be brought up to at least
100RPM in order for the electronic ignition to work
Fuel: Unleaded regular gasoline (no need to use high octane)


Displacement: 3.656 (59.91cc)
Bore: 1.732" (44.0mm)
Stroke: 1.551" (39.4mm)
RPM Range: 1,600-8,000 RPM
Output: 6.00 hp @ 7,000 RPM
Weight: Engine, 49.38 oz (1400 g)
Ignition module, 3.7 oz (105 g)
Suggested Propeller Size and RPM Data:
22x8 7,650 RPM
22x10 6,900 RPM
23x8 7,000 RPM
24x8 6,550 RPM
24x10 6,150 RPM
Carburetor Settings: Two turns out on high and low speed needles from
fully closed position, then start engine and follow break-in
instructions in manual

Distance/Vertical Mounting Hole Centers: 2.6" (66mm)
Distance/Horizontal Mounting Hole Centers: 3.1" (78mm)
Height of Mounting Tabs: 3.4" (85.6mm)
Height Lower Mounting Tab/Top of Cylinder Head: 6.9" (175mm)
Height Lower Mounting Tab/Crankshaft Center: 1.7" (42.8mm)
Height Crankshaft Center/Top of Cylinder Head: 5.2" (132.2mm)
Cylinder Head Width: 6.6" (168mm)
Width at Mounting Tabs: 3.8" (97.6mm)
Center of Muffler Mounting Holes: 1.6" (40mm)
Distance/Crankshaft Center to Muffler Hole Center: 2.7" (69.5mm)
Length from Carburetor to Backplate: 1.5" (38.8mm)


If using a different brand of oil other than Klotz, OS recommends
their own mix ratio which may differ from the manufacturers'
For 40:1, and 50:1 oils, OS recommends a 30:1 gas/oil mixture
25:1 is 5oz of pre-mixed 2-cycle oil or 151 ml per gallon of fuel
30:1 is 4.3oz of pre-mixed 2-cycle oil or 126 ml per gallon of fuel
40:1 is 3.2oz of pre-mix 2-cycle oil or 95 ml per gallon of fuel
50:1 is 2.6oz of pre-mix 2-cycle oil or 76 mll per gallon of fuel

The following mufflers are ideal for different applications;
J'TEC Large Wraparound Pitts Muffler for inverted
mounting applications.
Bisson Wraparound, and Inverted mufflers will also fit

jxs 10/29/12

See Tower Catalog page 173.
Easy RC: Engines
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