The Fuel Tank Connecting：
Valve clearance adjustment:
Note: when adjusting valve clearance, please remove the gear box cover from the back cover and adjust valve clearance according to the mark
on the gear.
The first adjustment of the valve clearance is after the engine has been running for 2 hours. It is necessary to adjust the valve clearance after
every 8 hours of flight. Before adjusting the valve clearance, it should be checked that the valve mechanism moves flexibly and freely without
jamming. Due to the thermal expansion of the metal material, the adjustment of the valve clearance should be performed after the engine is
completely cooled. When adjusting the valve clearance, the valve clearance should be adjusted during the compression stroke of the engine
(both intake and exhaust valves are fully closed). Rotate the propeller manually, as shown in the figure below, and correspond to the TDC
mark points on the large and small gears corresponding to the front and rear cylinder positions. In this position, insert the plug (thickness 0.06
- 0.1mm) between the rocker arm and the valve and then adjust with a hexagonal wrench. After adjusting the clearance, tighten the hex nut
(Note: Hexagon nuts should not be screwed too tight)
The sequence of front and rear cylinders
Front cylinder valve clearance adjustment diagram Rear cylinder valve clearance adjustment diagram
Valve clearance adjustment is one of the most important aspects of four-stroke engine maintenance. Excessive valve clearance affects the
performance of the engine, aggravating the wear of the tappet and the cam, causing the camshaft to produce an abnormal sound; Small valve
clearance(or no clearance) will also affect the performance of the engine, resulting in loose valve closure, compression stroke leakage, engine
hard to start, etc.
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