KEEWAY FACT 50 4T Maintenance Manual page 19

Failure Diagnosis
Diagnosis on failure or difficulty in starting engine
Weak spark or no spark between electrode
Screw off spark plug cap and conduct
sparkover test for high-voltage line
Large blue spark
Check whether spark plug and cap are in
good condition
Check
Check power
short circuit or
open
supply for
occurs
ignition
ignition coil
Non-contact ignition system
for electromagnetic motor
1. Check whether short
circuit or open circuit
occurs to ignition coil
2. Check whether short
circuit or open circuit
occurs to trigger coil
Failure or difficulty in starting engine
Remove the spark plug and check whether there is
N
Sparkover test for spark plug
Weak spark or no spark
whether Check
short circuit
circuit open circuit occurs
to inside the ignition
system
Check ignition system
carbon fouling between electrode.
Large blue or bluish purple spark between electrode
Check whether ignition is timely conducted with
1. Check whether CDI
ignition device is in
good condition
2. Check
flywheels and trigger
coil are loosened
whether
Check whether
or
CDI ignition
device is in
good condition
Normal
compression
pressure
19
Y
Eliminate carbon fouling
an ignition timing lamp
N
whether
Y
Check the compression
pressure of cylinder with
pressure gauge
Insufficient
compression
pressure
Y
Loosen drain
screws of the
carburetor and
check whether there
is gasoline in the
overflow pipe
N
Check
whether there
is gasoline in
the fuel tank
Y N
Add
gasoline