KEEWAY RKV125 Instruction And Maintenance Manual page 19

Fault Diagnosis
Symptom: Engine will not start or is hard to start
Diagnosis procedures
Remove the spark plug and check if electrodes of the plus are connected by carbon.
Spark is weak between electrodes or no spark at all.
Screw off spark plug cap, perform high-voltage wire spark over test
Strong blue spark leaps
Check spark plug and cap
Check ignition
Check
power
ignition coil is
supply.
shorted
broken.
Non-contact battery ignition system
1. Check electric quantity
of battery; 2.Check if
low-voltage circuit
broken or shorted;
Check if trigger coil is
shorted or broken.
Engine will not start or is hard to start
No
Perform spark-over test
Weak or no spark
Check if wires in
if
the ignition system
or are shorted
broken.
Non-contact magneto ignition system
1. Check if ignition
power supply coil is
is shortened or broken; 2.
3 Check if trigger coil is
shorted or broken.
Check ignition system
Strong blue or violet spark leaps between electrodes
Use an ignition timing lamp to check ignition timing of engine
1. Check CDI igniter 2.
Check
flywheel or trigger coil
looses.
Check if
CDI igniter
or
fails.
Compression
pressure
the
is normal.
Yes
Clean deposited carbon
No Yes
Loosen drain screw of
if magneto
carburetor and check
if there is oil flowing
out from overflow pipe
Yes
Check compression
pressure in the
cylinder.
Compression
pressure in
in
the cylinder
cylinder
is low.
No
Check oil in
tank.
the fuel
No
Yes
Refuel
gasoline