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Model: OS Motors OSMG1513
Dist. #: OSMG1513   SKU: OSMG1513

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Updated on Jul 20, 2018 06:57:22 PM

GGT15 Gasoline w/E4040...
This is the Gasoline Powered GGT15 Engine w/E4040 Muffler from O.S. Engines.

Perfect for larger 2-stroke .61-.91 class designs, and 4-stroke .91
    class designs
Begins quickly using a glow motorist and glow plug-eliminates ignition
    module and reduces weight
61H carburetor with PD-08 pump system
Shell type roller bearings
Two year restricted guarantee through Hobby Services starting at date
    of purchase

GGT15 Engine w/E4040 Muffler, #G5 Radiance Plug and Guidelines

Fuel: Gasoline and 2-cycle oil in a 50:1 mixture
Prop depending upon airplane: Sport,13x8-11
Acro, 14x8-10
Scale, 15x6-8
Radiance starter & field equipment

Displacement: 0.912 cu in (14.95cc)
Bore: 1.091" (27.7mm)
Stroke: 0.976" (24.8mm)
Practical RPM Variety: 2,000-11,000
Output: 2.35 ps/2.32 hp @ 15,000 RPM
Weight: Engine, 21.5oz (610g)
Muffler, 6.28oz (178g)
Range between Mounting Hole Centers Same Side: 0.98" (25mm)
Range between Mounting Hole Centers Reverse 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 Modification;
Gradually open throttle totally when engine is started.
Close needle valve 30-45° increasing RPM
When RPM begins decreasing, close needle valve 60-90°, then open
    slowly 15° per 2nd as RPM increases
Open needle valve 90° further from point where max RPM is obtained
Fly design till 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
    optimal mixture control valve position
    Mixture Control Valve Position;
Never aim to adjust till 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 till 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
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