NGH GT35R 2-Stroke RC Gasoline Engines Instruction Manual
- June 7, 2024
- NGH
Table of Contents
NGH GT35R 2-Stroke RC Gasoline Engines Owner’s Operating Instruction
Manual
Dear customer:
Thank you for purchasing our NGH GT35R gasoline engine. Professional GT35R
engine has been developed by NGH engineers to offer all hobbyists gasoline
engine. You will be delighted with fuel economy, reliability and power of your
GT35R. We hope that you will enjoy with your new engine, and have many fun and
safe flying experiences with its use.
Safety Instruction and WARNINGS!
Please read the instruction manual to become familiar with the features of the product before operating. Failure to operate the product correctly can result in damage to the product, personal property and cause serious injury. GT35R engine is NGH R&D manufacturing precision products. It must be operated with caution and common sense and requires some basic mechanical ability. This product is not intended for use by children without direct adult supervision. Don’t attempt disassembly, use with incompatible components or augment product in any way without the approval of our company. It is to read and follow all the instructions and warnings in the manual, prior to assembly, setup or use, in order to operate correctly and avoid damage or serious injury.
Age Recommendation: RC engine is not a toy! Not for children under 15 years.
The engine is designed for use on a model radio control airplane. If it is used for any purpose, we cannot be responsible for its reliability of safety.
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NGH or their dealers aren’t responsible for any loss, injury or damage resulting from the miss-use of RC engine.
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Keep away from the rotating propeller area while operating the engine.
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Do not wear loose clothing near the engine or the propeller.
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Do not operate the engine near loose material such as dirt, gravel, ropes, sand, etc.
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Always run your model engine in a well-ventilated area. Model engines produce possibly harmful carbon monoxide fumes.
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Always ensure that the propeller is securely attached to the engine shaft and all retaining fasteners are tightened properly before each flight.
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Always stand clear of and behind the propeller, ensure the face and body are far away from the propeller blade after trajectory. Never allow anyone, to be in front of or to the sides of the propeller when starting or running the engine.
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Always ensure that small parts in the children can’t touch place to prevent children from swallowing parts;
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Always check the propeller nut tightening.
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Gasoline is extremely flammable. Be careful of any sparks from electrical contacts such as fuel pumps, battery charger, etc.
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Allow your engine stop and cool before touching or fueling. The running engine of the surface temperature is high, easy to cause burns and other personal injury.
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Be sure to check whether there are loose bolts before flying. When install a muffler, the muffler in the threads of the
screw into the engine exhaust, until twist fixed, it is recommended to use screw glue. -
Ensure the engine and muffler in aircraft fairing environment with cold air, make sure the engine cooling.
Product Specifications:
Type : 2-Stroke AIR Cooled Gasoline Engine（Only used for fixed-wing aircraft model）
Volume： 34.96cc| Bore： 37.3mm
Stroke： 32mm| Carburetor： Walbro WT978
Mix Output： 4.2 HP/8800rpm| RPM Range：1500-8000rpm
Ignition： NGH automatic advancing angle ignition (RoHS and CE
Certified；Rcexl Manufactured)
Ignition Power： DC 4.8V – 8.4V 1000mAH| Spark plug type： CM6
Fuel : standard 92 octane gasoline + FD 2-stroke oil| Mixing ratio：
gasoline : oil = 35:1
Mixing ratio： gasoline : oil = 35:1| Weight：engine 1150g, ignition
100g, muffler 140g
Carburetor setup, adjust:
NGH-GT35R two-stroke gasoline engine used Walbro WT978 carburetor is designed
for NGH unique. It has the perfect stability of idle speed and acceleration
sensitivity.
Always remove fuel from the carburetor after flight. Not doing so will result
in rubber carburetor is components deteriorating over time, causing loss of
engine performance. Methods: Start the engine without connecting the fuel pipe
until we run out of fuel in the carburetor.
Setup Carburetor:
1 – -Choke: Close it before the first start the engine, and quickly rotating propeller, the fuel oil suction within the tank into the carburetor, when you start the engine should be open it.
2– The throttle control arm Infinitely adjustable-speed device, control the turning speed of the engine.
3–Nozzle: Connect the oil tank and supply the fuel to engine.
4–High speed needle.: After fully open the throttle control arm 2 , adjust the high speed needle can get the best high speed.
5–Idling speed needle: Put return to the initial position, adjust the idling speed needle can obtain satisfactory low speed.
6– Idle mixture adjustment screw: Adjusting the fuel and air mixing ratio at idle, it actually control the initial position of 2 , adjust 8 and 5 will obtain the better idling speed.
The initial setup of the carburetor is factory settings, the engine first
start don’t need to adjust.
The factory setting status :
4– High speed needle, Fully closed (clockwise) before exiting(anticlockwise) 1.5-1.75 times
5– Idle speed needle, Fully closed (clockwise) before exiting(anticlockwise) 1.5-1.75 times
6– Idle mixture adjustment screw, The throttle control arm at the other
end of the limit pawl near the screw cone
about 1.5mm.
Adjust Carburetor:
When the engine running, you want to adjust the carburetor, please adjust it
based on factory Settings: In the process of adjusting the carburetor, please
use a high-quality tachometer to determine your adjusted results, the
tachometer you need to buy one.
First adjust the high speed needle: Engine run time will be turned on at full
throttle position, adjust the high needle and watch the change of the
tachometer, make the engine rpm reach the max per minute. Engine work in a
stable high speed
(please note: do not let the engine run boundary for a long time, this is
a big damage for engine). Adjust the idle speed needle: The throttle return to
the idle position, adjust the idle speed needle and watch the change of the
tachometer. Let the engine run in a stable state of idle speed (Advice 19×8
wooden propeller idle speed at 1800rpm). When necessary and idle mixture
adjustment screw joint adjustments to ensure the engine idle speed stability,
smooth acceleration; If the engine is idling start difficult (Exclude CDI
ignition power shortage, excessive fuel combustion chamber, spark plug
problems and so on). This shows that air-fuel ratio (A/F) is low at idling,
please adjust idle mixture adjustment screw, increase air ratio, or adjust
idling needle to reduce the amount of fuel, A/F ratio to achieve appropriate
proportion. ( Tip : The larger engine propeller, the more perfect lower
idle speed you will get. )
When the engine high speed and idle speed adjustment is completed, try to run
the engine acceleration performance. First let the engine to run 10 seconds at
idling and the quickly move the throttle control arm at full throttle
position, there will be the following three situations:
A. Engine speed is responsive and smooth transition to the highest speed,
instructions for the adjustment of the engine is good.
B. Engine acceleration has a cough performance, gradually transition to
the highest speed, illustrate the idle speed needle set relatively rich oil,
the idle speed needle to make a small adjustment (clockwise rotation), and
then try again, try to accelerate the reaction constant adjustment until the
engine reaches your request.
C. Rapid throttle when the engine suddenly stopped running, this shows
that the idle speed needle set relatively lean oil, the idle speed needle to
make a small adjustment (anticlockwise rotation), and then try again, try to
accelerate the reaction constant adjustment until the engine reaches your
request.
Starting the engine:
- According the engine connection method, install the engine on RC airplane and lock propellers. Made the carburetor initial setup and connect the spark plug, electronic ignition and sensors, put the fuel into the oil tank, connect the power and radio control equipment.
- Will power off the electronic igniter at this time, make the carburetor inlet port in a fully closed position. Through the motor starter rapidly rotating propeller engine make the fuel in the tank inhalation of carburetor, please pay attention to the suction of fuel should not be too much, otherwise will drown the spark plug, the engine start difficult.
- Please open the carburetor throttle air inlet, power on the electronic igniter, then start the engine using the motor starter, the engine will begin to work, the fans will adjust the carburetor according to your own need. According to the above steps to adjust the carburetor adjustment.
Warning: Make sure all bystanders, especially children, at least 30 feet away from rotating engine.
Engine Break-in:
Please use the high quality synthetic oils, gasoline and machine oil’s
mixing ratio is 35:1. NGH is recommended to use smaller size propellers at
first break-in and follow-up about 10 times in flight. Keep medium speed
running for 15 minutes (no more than 4000rpm) after started engine, then high
speed running (7000 rpm) for 3 minutes, again medium speed running for 5
minutes, high speed running for 3 minutes, reciprocating 3-5 times complete
break-in. Breaking in engine carefully will increase its life. Please make
sure the engine got the complete break-in before you use the larger load
propeller.
Engine cooling:
If your engine is installed in the fairing, there must be air entering to
cool the engine and ensure enough air flowing in the faring. Reference data:
Outlet area should be 3-5 times than the entrance area to ensure adequate
cooling.
Engine Failure Removal:
If the engine is difficult to start, idle speed and high speed unstable.
Please check: whether the electric circuit and oil line of engine is trouble,
whether the engine leaks air, whether the electronic ignition works or its
power supply is adequate, whether the spark plug flame out. If necessary,
replace with a new spark plug.
Engine Maintenance:
To reduce the fuel consumption, extend engine’s life, please adjust the
engine’s highest speed and make engine run in the output maximum speed of 90%
once the gas pedal full opened. If the load is large ( Propeller’s diameter
and screw pitch are big ), the fuel must be adequate. If the load is small,
the speed will be high while the fuel consumption will be less; Please make
sure to empty the carburetor after each flight, otherwise it’ll cause the
rubber of carburetor aging to affect the engine performance; Please clean the
carbon deposition on the spark plug and keep the gap from 0.7mm to 0.8mm
between the electrodes; If it’s difficult to start the engine, idle speed
unstable or when high speed operation flameout, please replace the spark
plugs; Please clean the engine surface after used each time, it can make the
engine get better cooling; The carburetor may be blocked seriously if you use
different brands or types of lubricating oil together, you need select a
better fuel filter; If the engine low speed work for a long time, can lead to
spark plug carbon deposition; Regularly check the fuel system, make sure do
not leak fuel, do not leak air.
Engine Guarantee:
If the NGH engine has performance defects caused by the defects of process,
material and manufacturing, we certify that: Change for free within one year
and Guarantee within two years since the date you purchased. Please note the
guarantee is only for the original purchaser, not including: Normal wear for
engine; damage caused by the failure of maintenance; damage for engine over
speed operation caused by using small propeller; Bearing rust; Crash; Use
inappropriate fuel; Damage caused by foreign bodies; Damage caused by
unreasonable installation or operating environment; Damage caused by improper
dismantle; Damage caused by any modification.
The instructions are only for reference and are subject to change without
notice.
Web: www.nghengine.com
E-mail : ngh@ncdmoly.com
xhlgjywb@163.com
Skype: blue-sky-tan
References
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