16
Valve leakage
Check valve clearance and valve
tightness, repair when necessary
If gasoline engine is still unable to be started, please send it to authorized dealer of the
Company for overhaul.
⚫
Spark detection
Ensure that there is no spilled fuel outside the gasoline engine and the spark plug is
not soaked by fuel.
In order to prevent fire, keep sparks away from spark plug mounting hole.
When doing testing to the spark plug, it is strictly prohibited to hold the spark plug
with wet hand.
When operating, put the fuel switch in the "OFF" position, and drain off the fuel in the
carburetor.
Remove the spark plug cap and spark plug.
Pull the starter handle to release unburned gas out of the cylinder.
Assemble spark plug cap.
Ground the negative electrode (threaded part) of spark plug via the cylinder head, pull the
starter handle to observe the spark condition.
4-1-2 Underpowered
Phenomenon
Cause
Remedy
When raising
the throttle, the
speed increases
slowly, and the
speed decreases
or the engine
shuts down
Fuel supply
system
There is air in oil way or oil way
blockage
Exhaust and dredge oil way
Needle valve hole and the main hole
are blocked in the carburetor
Clean, and blow through
Fuel tank switch is clogged
Clean and replace damaged
part
Spark plug
Ignition coil
secondary cable
