KEEWAY ARN125, Service And Maintenance Manual

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5 . E x a m i n e a n d r e p a i r f o r f a u l t
·Engine doesn’t start or difficult to start
（inspect if ignition switch is in “ON” position） possible cause
1.unscrew
discharging fuel screw for carburetorand fuel doesnot flow into
-fuel switch has been turned off
Inspect if fuel flows into carburetor -there is not fule in fuel tank
-Fuel filter is blocked
Fuel flows into carburetor -fuel hose is blocked
-
Carburetor floater or needle is blocked
-Ventilating hole on fule tank cover is blocked
2.do ignition testing spark is a little weaker or cannot ignite - something is wrong with spark plug
-there is carbon deposit on spark plug
-
Spark
plug and coil are cut off or short circuit exsists for them
Ignition is good -ignition switch is wrong
-Wiring connection of ignition system is
not well or open circuit, short circuit happens.
-CDI is wrong
-Charging coil is wrong
-Touching off coil is wrong
3.
use correct start mode to start engine Engine s
Engine s Engine s
Engine starts but stops soon
- idle
mixture ratio screw is not adjusted
correctly
-Carburetor is blocked
Engine cannot start -Ignition advances or delays
-Mixed gas is too thin or thick
4.Remove and inspect spark plug Spark plug is moist - -carburetor choke is shut too tight
-Fuel leaks out from carburetor
Spark plug is dry -Mixed gas is too thick
-There is too much dust on air cleaner
-Fuel flows into combustion chamber
5.
Measure air pressure in cylinder
air pressure is too low ----valve seat mesh is not correct
-valve clearance is too small
Air pressure is normal -opening time of valve delays
-Cylinder and piston are abraded
-Cylinder head gasket is damaged
-Valve is blocked
-Ignition advances or delays
6. Pull choke to start