O.S. GF30 30cc 4-Stroke Gas Engine w/Ignition Module

Tower Stock# LW5181  •  Manufacturer Stock# 3A000
O.S. GF30 30cc 4-Stroke Gas Engine w/Ignition Module (large view)
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Notes from our tech department:
This is the O.S. Engines GF30 4-Stroke Gasoline Engine.

FEATURES

Ideal for models designed for 1.20-1.50 glow engines or 20cc gasoline
engines
Same firewall mounting system as the O.S. GT22
Rear mounted O.S. designed carb with PD-08 fuel pump
Lightweight IG-07 igniton module accepts up to 2S LiPo power
Positive Crankcase Ventilation (PCV) helps keep model and environment
cleaner by eliminating blow-by gas and oil waste
Two year limited warranty through Hobby Services beginning at date of
purchase

INCLUDES

GF30 4-Stroke Gasoline Engine, Spark Plug, Muffler, Ignition
Module and Instructions

REQUIREMENTS

2-cycle oil, see SPECS
Ignition Battery: 4.8-6.0V NiCd or NiMH, 6.6V LiFe or 7.4V LiPo pack
LiPo battery requires voltage regulator
Propeller: 16x10-12, 17x8-10, 18x6W-8
Mounting standoffs, length depends on aircraft
Gasoline safe fuel tubing and fuel filter

SPECIFICATIONS

Carburetor Adjustments;
Needle Valve: Slowly open throttle fully after engine is started.
Close needle valve in 30-45 increments. When RPMs start to
decrease, close needle valve 60-90 further. Open slowly at 15
per second until maximum RPM is obtained, then open 60-90
further from max RPM point
Mixture Control Valve: Preset at nearly best position. Do not adjust
until break-in is completed
Start engine & open throttle fully to warm up engine. Set idle
around 2000RPM from throttle trim on transmitter. Move throttle
from idle to fully open several times & measure idling RPM with
tach. If idling is unstable & RPM decreases gradually, the
mixture control valve is set rich. If RPM increases at idling
or engine doesn't respond quickly, the mixture is too lean.
Stop engine & turn mixture control valve 30 clockwise if
mixture is too rich, or 30 counterclockwise if too lean.
Repeat above procedure until idling RPM becomes stable.
For final main needle adjustment, set idling RPM by transmitter
depending on prop size and aircraft model. Move throttle stick to
full throttle quickly and then to full throttle slowly,
adjusting needle 15 counterclockwise if too lean, or 15
clockwise if too rich.

Displacement: 1.827 cu in (29.94 cc)
Bore: 1.496" (38mm)
Stroke: 1.039" (26.4mm)
Practical RPM Range: 1,800-9,000
Output: 2.8s/2.76hp @ 9000RPM
Weight: Engine, 34.9oz (990g)
Muffler, 4.0oz (113g)
Ignition Module, 3.35oz (95g)
Gasoline/Oil Mixture: 30:1 - 50:1
25:1 fuel/oil mixture if brand of oil states 50:1 mix
Crankshaft Size: UNF5/16-24
Length from Pump to Drive Hub: 5.7" (145.6mm)
Length from Center of Crankcase to Drive Hub: 3" (76.5mm)
Length from drive hub to end of Crankshaft: 1.6" (40mm)
Length from Carburetor to end of Crankshaft: 7.3" (185.6mm)
Height from Mounting Tab to Rocker Cover: 4.7" (119.6mm)
Height bottom of Crankcase/top of Rocker Cover: 5.7" (146mm)
Distance/Mounting Hole Centers Same Side: 0.98" (25mm)
Distance/Mounting Hole Centers Opposite Side: 2.36" (60mm)

jxs 07/01/14
ir/jxs

Resources
See Tower Catalog page 173.
Easy RC: Engines
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