Instructions for use

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GF30 4-Stroke RC Gasoline Engines

Owner’s Operating Instruction Manual

Dear customer:

Thank you for purchasing NGH GF30 4-stroke gasoline engine. The engine has been developed by NGH engineers to

offer all hobbyists a new 4-stroke engine. You will be delighted with stability, fuel economy, energy saving,

environmental protection, low noise, large torque output of your NGH GF30. We hope that you will enjoy with your

engine, and have many fun and safe flying experiences with its use.

Safety Instruction and WARNINGS!

Please read this instruction manual carefully before operating and be familiar with features of this product. Improper

operation may cause damage of the products even lead to property loss and personal injury.

GF30 engine is precision products manufactured by NGH R&D. It must be operated with caution. The operator shall

master knowledge of internal combustion engine as well as basic mechanical ability. This product is not suggested for

use by children without instructed by adults. Don’t attempt disassembly, use with incompatible components or augment

product in any way without authorized approval by our company. It is to read and follow all instructions and warnings

of this manual before assembly, setup or use to ensure operate correctly and avoid damage or serious injury.

Age Recommendation: RC engine is not a toy! Forbidden 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 won't be responsible

for its stability and safety.

·NGH or their dealers aren’t responsible for any loss, injury or damage resulting from the miss-use 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, 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 place 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

charger, etc.

·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.

·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：4 - stroke air cooled gasoline engine（Only used for fixed-wing aircraft model）

Bore：36mm

Stroke：29.4mm

Volume：29.91cc

Carburetor：Walbro WT962

Mix Output：3.16 HP/9000rpm

RPM Range：1600-8500rpm

Ignition：NGH Automatic advancing angle ignition ( RoHS and CE Certified )

Ignition Power：DC 4.8V - 8.4V 1000mAH

Spark plug type：CM6

Fuel: 92# Unleaded gasoline + Fully synthetic lubricants

(Non-4-stroke lubricants)

Mix ratio： Gas : Oil = 35:1

Recommended propeller：15x10, 16×8-10, 17x6-10

（Two blades）

Weight：engine 1160g, ignition 105g, muffler 100g

Summary of content (4 pages)

PAGE 1
GF30 4-Stroke RC Gasoline Engines Owner’s Operating Instruction Manual Dear customer: Thank you for purchasing NGH GF30 4-stroke gasoline engine. The engine has been developed by NGH engineers to offer all hobbyists a new 4-stroke engine. You will be delighted with stability, fuel economy, energy saving, environmental protection, low noise, large torque output of your NGH GF30. We hope that you will enjoy with your engine, and have many fun and safe flying experiences with its use.
PAGE 2
Carburetor setup and adjustment: NGH-GF30 four-stroke gasoline engine used Walbro WT carburetor is designed for NGH unique. It has the perfect stability of idle speed and acceleration sensitivity. It's better to remove fuel from the carburetor after a set of flight to avoid carburetor rubber components deteriorating over time, which may lead to engine performance failure. Methods: Start engine without connecting the fuel pipe until all fuel oil in the carburetor exhausted.
PAGE 3
The Fuel Tank Connecting： Fuel tank connection diagram Valve clearance adjustment: After approximately 2 hours flight, valve clearance adjustment may be necessary. Before adjusting valve clearance,should check valve body to move freely, no clamping stagnation phenomenon. Due to the thermal expansion of metal materials, valve clearance adjustment should be carried out after engine has cooled completely.
PAGE 4
Starting the engine: 1. 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. 2. Power off the electronic igniter at this time and close the carburetor choke.