Table of Contents
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Two stroke gasoline engine for airplanes
GT55
It is of vital importance, before attempting to
operate your engine,
'SAFETY INSTRUCTIONS AND WARNINGS'
section on pages 2-5 of this booklet and to
strictly adhere to the advice contained therein.
Also, please study the entire contents of this
instruction manual, so as to familiarize
yourself with the controls and other features of
the engine.
Keep these instructions in a safe place so that
you may readily refer to them whenever
necessary.
It is suggested that any instructions supplied
with the aircraft, radio control equipment, etc.,
are accessible for checking at the same time.
to read the general
2-5
6
7
8
ENGINE EXPLODED VIEW
9
ENGINE PARTS LIST
10
11-12
13-14
ENGINE THREE VIEW DRAWINGS
15-16
17
1
CONTENTS
18-23
24-25
26-27
28
29
30
31
32-33
34
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Table of Contents
Related Manuals for O.S. engine GT55
Summary of Contents for O.S. engine GT55
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Page 1: Table Of Contents
It is suggested that any instructions supplied with the aircraft, radio control equipment, etc., are accessible for checking at the same time. CONTENTS SAFETY INSTRUCTIONS AND 18-23 WARNINGS ABOUT YOUR O.S. ENGINE RUNNING-IN / STARTING 24-25 ABOUT THE ENGINE NEEDLE ADJUSTMENTS ENGINE PARTS NAME FLIGHT &... -
Page 2: Safety Instructions And Warnings About Your O.s. Engine
Always store it in a clearly marked If at some future date, your O.S. engine is acquired by container in a cool and dark place and out another person, we would respectfully request that these of the reach of children. - Page 3 NOTES When checking a spark plug with the power source Always check the throttle linkage. on, do not hold the plug, plug cap, high tension cord If it is disconnected, throttle action becomes nor grounding wire, or you will get a shock. uncontrollable, which may result in a serious accident.
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Page 4: About The Engine
Spark Plug CM-6 The engine unit, carburetor and igniter are specially designed. It offers broad power characteristics suitable for Exhaust Gasket GT55 sport flight as well as acro flight. The large and dense cooling fins ensure sufficient cooling against overheating. -
Page 5: Silencer / Installation
Also, use the Nord Lock Washers (optional extra) and area. other anti-loosening washers or apply locking agent. The GT55 does not come with a silencer. Select an Be sure that there is sufficient air intake and outlet area on effective silencer from commercially available ones. -
Page 6: Carburetor Wla-2 Parts Name
CARBURETOR WLA-2 PARTS NAME Carburetor Body Choke Valve Lever High Speed Needle Idle Speed Stop Lever Idle Speed Stop Screw (No need to adjust. Factory adjusted.) Throttle Valve Lever Slow Speed Needle Retaining Screw Fuel Inlet High Speed Stop Lever Spring Throttle Return Air Vent Fitting Throttle Valve Lever... -
Page 7: Ignition Module
Connect the linkage so that the throttle valve is fully Before connecting the throttle linkage, make sure that the opened when the throttle stick on the transmitter is fully throttle valve lever does not interfere with the bulkhead or advanced. (Adjust the movement so that the pushrod does mount of the model when it is fully closed and opened. -
Page 8: Propeller
Precautions Do not disassemble the ignition module and plug cap. Check the ignition module for spark when installing the (The ignition module is irreparable. Replace it when plug cap on the plug and be careful about getting a shock. necessary.) Make sure there is no flammable material or gasoline vapors near by that could ignite. -
Page 9: Mixing Of Oil
INSTLLATION OF PROPELLER Install the propeller on the shaft so that the curved face of the blades faces forward – i.e. in the direction of flight. Firmly tighten the propeller washer and propeller retaining screws using the correct size wrench. Always check the tightness of propeller retaining screws and retighten them, if necessary, before restarting the engine. -
Page 10: Running-In / Starting
RUNNING-IN / STARTING Use a fuel with increased oil content and set the needle a Always check the throttle linkage. little on the rich side. Too rich a needle setting may cause If it is disconnected, the engine becomes misfiring or erratic running due to fouling of the plug. uncontrollable, which may result in a serious accident. - Page 11 Second and later starting of the day Flip the propeller until the fuel runs out of the carburetor, then flip 3~4 times more (6~7 times in winter). Set the throttle stick on the transmitter at bottom or 1/8 (In case of upright and side installation, flip 7~8 more time (2~3 clicks) advanced from the bottom.
- Page 12 Starting with a Chicken stick or gloved hand No.2 Note (It is suggested to use an electric starter.) If the engine does not start after more than 5 times repeat the procedure, over-priming is suspected. Fist starting of the day Check whether the plug is wet or not.
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Page 13: Needle Adjustments
NEEDLE ADJUSTMENTS The slow speed needle is effective through the high Start the engine. Open the throttle valve slowly until fully speed range, while the high speed needle is not effective open and run the engine for 10 seconds to warm the in the low speed range. -
Page 14: Flight & Maintenance
FLIGHT & MAINTENANCE Checking prior to flight Enlarge the air intake cutout on the cowling. When the engine is started, make sure the radio control Enlarge the air outlet cutout on the cowling. (It is system works normally (distance test). vitally important.) Partly cover the air intake cutout on the cowling where Engine does not run erratic with full throttle. -
Page 16: Carburetor Exploded View
CARBURETOR EXPLODED VIEW N4-40x5 4-4x40 4-40x4 24-1 24-3 N4-40x5 24-2 24-5 24-6 4-4x40 19-1 24-4 Type of screw N...Round Head Screw CARBURETOR PARTS LIST Code No. Description Code No. Description 29781340 Spring-Choke Friction 29781020 Gasket Passage Ball Plate-Passage 29781330 29781030 29781460 Plug-Friction 29781040... -
Page 17: O.s. Genuine Parts & Accessories
O.S. GENUINE PARTS & ACCESSORIES GT55 SILENCER TYPE1 (E-6010) Code No. Description With Plain Washer M5 (2pcs.) 74003540 M5 Stand Off Engine Mount 1" (25.4mm) (4pcs.) (74003010) 79871515 Hex Socket Head Bolt M5x15 (10pcs./sets) Cap Screw M5x50 (10pcs./sets) (79871550) 79871520 Hex Socket Head Bolt M5x25 (10pcs./sets) -
Page 18: Three View Drawing
THREE VIEW DRAWING Specifications Displacement 54.93 cc / 3.352 cu.in. Bore 41.2 mm / 1.62 in. Stroke 41.2 mm / 1.62 in. PracticalR.P.M. 1,500-8,000 r.p.m. Output 5.5 ps / 5.58 hp / 7,000r.p.m. (Engine) Weight 1580 g / 55.7 oz. 140 g / 4.94 oz.