Instructions for use

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 Valve clearance adjustment diagram

adjustment should be carried out after engine has cooled completely.

Adjust the valves must be in the engine’s compression stroke (Intake

and exhaust valves in a fully closed position). When adjustment is

completed, make sure you tighten the hexagonal nut.

How to adjust the valve clearance:

Remove the rocker arm cover; revolve the propeller slowly by hand and align with TDC mark. Meanwhile the marker

on the camshaft is directly below. In this position, take a small sheet (thickness 0.06 - 0.1mm) into between rocker and

valve. With a hexagonal wrench adjustment, after that, tighten the hex nut (note the hexagonal nut should not be

screwed too tight), as shown in the figure below.

The valve clearance is the most important factor in the maintenance of four-stroke engines, and operation with an

excess clearance will degrade performance. In particular, a large gap aggravates abrasion of the tappet will made the

cam increases the unusual sound; a small gap (or no gap) is also influence the performance of the engine, so that the

valve does not close tightly resulting the compression stroke air leaks.

Engine installation:

NGH-GF30 4-stroke engine need to use rail bracket mount on a suitable RC aircraft. It can effectively reduce the high

frequency vibration of four-stroke engine running at a high speed. As shown below:

Notice: Please make sure to install a firewall on the back of RC aircraft using metal flat washer or ratchet nut to prevent

the pawl bolt into plywood. Be sure to check before you fly if there are loose bolts.