4-17
Description
Reason
Remedy
Engine
i
s ha
rd t
o st
ar
t, engi
n
e
st
ops a
ut
om
at
ical
ly
Fuel pump fails to work
The system lacks power or the fuel pump plug has no power
Check the battery, fuse, fuel pump relay, cable.
Replace ECU if all above is ok. Then check them again
Fuel pump plug has power
Fuel pump is damaged
Replace the fuel pump
The voltage is too low
Check the battery, relay and circuit
Fuel pump
is normal
No fuel pressure
Fuel pump wire is inversely connected
Exchange the connection
The battery voltage is too low
Charge or replace the battery
Fuel tank lacks power
Add fuel, no less than 2.5L
Fuel passage is clogged heavily
Check the fuel coarse cleaner and fine filter
Failure of fuel pressure adjuster
Replace fuel pressure adjuster
Insufficient fuel
pressure
Leakage of fuel passage
Replace or repair the loose fuel pipe clip or broken fuel pipe
Clogging of fuel passage
Check the fuel coarse cleaner and fine filter
Failure of fuel pump or fuel pressure adjuster
Replace fuel pump or fuel pressure adjuster
Insufficient voltage
Check the battery, rectifier and magneto to see is it is charged
Fuel pressure is
normal
Ignition
voltage
is
normal
Spark plug is damp or choked
Remove and clean the spark plug. Idle the engine for a few times
Electric leakage of spark plug insulation parts
Replace the spark plug
Spark plug is not tightened
Tighten
Too little clearance of spark plug electrodes
Adjust it to the standard value
Poor contact or electric leakage of cavity cap
Adjust or replace
Failure of the circuit, poor contact of plug-in
Check the cable joint, throttle position sensor mounting and
circuit connection or plug-in
Engine temperature sensor is damaged
Replace
Failure of the engine
Check the engine valve, piston ring and mounting.
No ignition
voltage
or
ignition off
Poor contact of ignition circuit
Check the joint and restore
Too much clearance of magneto exciter coil
Adjust the exciter coil clearance
Ignition coil is damaged
Replace