IMI HOBBY GT17 2-Stroke RC Gasoline Engines Instruction Manual
- October 30, 2023
- IMI HOBBY
Table of Contents
IMI HOBBY GT17 2-Stroke RC Gasoline Engines
Dear customer:
Thank you for purchasing our NGH GT17 gasoline engine. Professional GT17
engine has been developed by NGH engineers to offer all hobbyists gasoline
engine. You will be delighted with the fuel economy, reliability, and power of
your GT17. We hope that you will enjoy 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. GT17 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 incompatible components or augment the 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.
- NGH or their dealers aren’t responsible for any loss, injury or damage resulting from the misuse of RC engine.
- Keep away from the rotating propeller area while operating the engine.
- Do not wear loose clothing near the engine or the propeller.
- Do not operate the engine near loose material such as dirt, gravel, ropes, sand, etc.
- Always run your model engine in a well-ventilated area. Model engines produce possibly harmful carbon monoxide fumes.
- Always ensure that the propeller is securely attached to the engine shaft and all retaining fasteners are tightened properly before each flight.
- Always stand clear of and behind the propeller, and 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.
- Always ensure that small parts in the children can’t touch places to prevent children from swallowing parts;
- Always check the propeller nut tightening.
- Gasoline is extremely flammable. Be careful of any sparks from electrical contacts such as fuel pumps, battery chargers, etc.
- Allow your engine to stop and cool before touching or fueling. The running engine of surface temperature is high, easy to cause burns and other personal injury.
- Be sure to check whether there are loose bolts before flying. When installing a muffler, the muffler in the threads of the screw into the engine exhaust, until twist is fixed, it is recommended to use screw glue.
- Ensure the engine and muffler are in the aircraft fairing environment with cold air, and make sure the engine is cooling.
Product Specifications
Type：2 Cycle Air Cooled Gasoline Engine（Only used for fixed-wing aircraft model）
Volume：16.91cc| Bore：29
Stroke：25.6mm| Carburetor：Walbro WT962
Mix Output：1.98HP@9500RPM| RPM Range：1900-9000RPM
Ignition：NGH automatic advancing angle ignition (RoHS and CE
Certified；Rcexl Manufactured)
Ignition Power：DC 4.8V – 8.4V 1000mAH| Spark plug type：1/4 – 32
Fuel: Standard 92 octane gasoline + FD 2-stroke oil| Mixing ratio： gasoline :
oil = 25:1
Recommended propeller：15×10, 16×8, 16×10, 17×8
（Two blades）
| Weight：engine 630g, ignition 100g, muffler 120g
Carburetor setup, adjust
NGH-GT17 two-stroke gasoline engine used Walbro WT962 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
- Choke： Close it before the first start the engine, and quickly rotate propeller, the fuel oil suction within the tank into the carburetor, when you start the engine should be open it.
- The throttle control arm： An infinitely adjustable-speed device, controls the turning speed of the engine.
- Nozzle： Connect the oil tank and supply the fuel to the engine.
- High-speed needle.：After fully opening the throttle control arm ②, adjust the high-speed needle can get the best high speed.
- Idling speed needle：Put ② return to the initial position, adjust the idling speed needle can obtain a satisfactory low speed.
- Idle mixture adjustment screw：Adjusting the fuel and air mixing ratio at idle, it actually controls the initial position of ②, adjust ⑥ and ⑤ will obtain a better idling speed. The initial setup of the carburetor is factory settings, the engine’s first start don’t need to adjust.
The factory setting status:
- High speed needle, Fully closed (clockwise) before exiting(anticlockwise) 1.5 ～ 1.75 times；
- Idle speed needle, Fully closed (clockwise) before exiting(anticlockwise) 1.75 ～ 2 times；
- Idle mixture adjustment screw, The throttle control arm at the other end of the limit pawl near the screw cone about 2mm.
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 16×8 wooden propeller idle speed at
1900rpm). 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 the idling needle to reduce the amount of fuel,
A/F ratio to achieve the appropriate proportion. ( Tip: The larger the 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 then quickly move the throttle control arm at full throttle position,
there will be the following three situations:
- Engine speed is responsive and smooth transition to the highest speed, instructions for the adjustment of the engine is very good.
- Engine acceleration has a cough performance, and gradually transitions to the highest speed, illustrate the idle speed needle set with relatively rich oil, the idle speed needle to make a small adjustment (clockwise rotation), and then try again, try to accelerate the reaction with constant adjustment until the engine reaches your request.
- Rapid throttle when the engine suddenly stopped running, shows that the idle speed needle set relatively lean oil, the idle speed needle makes 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 to the engine connection method, install the engine on RC airplane and lock the propellers.
Made the carburetor initial setup and connect the spark plug, electronic ignition and sensors, put the fuel into the oil tank, and connect the power and radio control equipment. -
Will power off the electronic igniter at this time, and 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 starts 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 the rotating engine.
Engine Break-in:
Please use high-quality synthetic oils, gasoline and machine oil’s mixing
ratio is 25:1. 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 starting the 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 flows in the faring. Reference data: The
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 are unstable.
Please check: whether the electric circuit and oil line of the engine is
trouble, whether the engine leaks air, whether the electronic ignition works
or its power supply is adequate, and whether the spark plugs flame out. If
necessary, replace with a new spark plug.
Engine Maintenance:
To reduce fuel consumption, and extend the engine’s life, please adjust the
engine’s highest speed and make the 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 the carburetor aging to affect the engine performance; Please
clean the carbon deposition on the spark plug and keep the gap from 0.5mm to
0.6mm 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 to 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 it: Change for free within one
year and Guarantee within two years from the date you purchased it. Please
note the guarantee is only for the original purchaser, not including Normal
wear for the engine; damage caused by the failure of maintenance; damage for
engine over speed operation caused by using a small propeller; Bearing rust;
Crash; Use of inappropriate fuel; Damage caused by foreign bodies; Damage
caused by the 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
Read User Manual Online (PDF format)
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