O.S. GGT15 15cc Gas/Glow Ignition 2-Cycle Engine w/Muff

Tower Stock# LXEJRK  •  Manufacturer Stock# 3A200
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Notes from our tech department:
This is the Gasoline Powered GGT15 Engine w/E4040 Muffler from O.S. Engines.

FEATURES

Ideal for larger 2-stroke .61-.91 class models, and 4-stroke .91
class models
Starts easily using a glow driver and glow plug-eliminates ignition
module and reduces weight
61H carburetor with PD-08 pump system
Shell type roller bearings
Two year limited warranty through Hobby Services beginning at date
of purchase

INCLUDES

GGT15 Engine w/E4040 Muffler, #G5 Glow Plug and Instructions

REQUIREMENTS

Fuel: Gasoline and 2-cycle oil in a 50:1 mixture
Propeller depending on aircraft: Sport,13x8-11
Acro, 14x8-10
Scale, 15x6-8
Glow starter & field equipment

SPECIFICATIONS

Displacement: 0.912 cu in (14.95cc)
Bore: 1.091" (27.7mm)
Stroke: 0.976" (24.8mm)
Practical RPM Range: 2,000-11,000
Output: 2.35 ps/2.32 hp @ 15,000 RPM
Weight: Engine, 21.5oz (610g)
Muffler, 6.28oz (178g)
Distance between Mounting Hole Centers Same Side: 0.98" (25mm)
Distance between Mounting Hole Centers Opposite Side: 2.04" (52mm)
Width at Mounting Tabs: (61mm)
Width of Crankcase below Mounting Tabs: 1.7" (44mm)
Width from Crankcase Center to Exhaust Outlet: 4.4" (112.3mm)
Height/bottom of Mounting Tabs to Muffler Bottom: 1.5" (37.6mm)
Length/Crankcase Center to Drive Washer: 2.6" (66.8mm)
Length/Crankcase Center to end of Crankshaft: 4.03" (102.6mm)
Length from Pump to end of Crankshaft: 5.6" (142mm)
Crankshaft Size: UNF 5/16-24
Rearward Needle Valve Angle Relative to Engine: 30
Needle Valve Adjustment;
Gradually open throttle fully when engine is started.
Close needle valve 30-45 increasing RPM
When RPM starts decreasing, close needle valve 60-90, then open
slowly 15 per second as RPM increases
Open needle valve 90 further from point where max RPM is obtained
Fly model until running in is completed (10 tanks of fuel)
After running in is completed, set idle around 3000RPM
Stop engine, close mixture control valve 15, note idling RPM
90 opened position from where max idling RPM is obtained is
optimum mixture control valve position
Mixture Control Valve Position;
Never try to adjust until needle valve adjustment is performed
Open mixture control valve one turn (360), open & close a few
times to be sure there is no resistance during throttle movement
Close mixture control valve 30
Rotate throttle until resistance is felt when opening throttle
from closed position
Open mixture control valve approximately 90 from this point-this
is the initial mixture control valve position

jxs 07/01/14
ir/jxs

Resources
See Tower Catalog page 173.
Easy RC: Engines
Industry Review #1
Manufacturer Product Web Page
Manufacturer Mailing Address
Additional Manufacturer Contact Info