Generic Race 50, Service Manual

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Troubleshooting
Trouble diagnosis program for engine start failure or difficulty
Engine fails or is difficult to
start
Check ignition
system
Remove spark plug to check between its
electrodes for carbon connection
Perform spark over test of
spark plug
Clear carbon deposit
Sparks between electrodes weak or
none at all
Strong blue or purple blue sparks can jump out
from between electrodes
Screw off spark plug cap to perform
spark over test of ignition coil
Use an ignition timing light to detect if engine
ignition timing is correct
Strong blue sparks can
jump out
Sparks weak or none at
all
Check spark plug and its cap for
malfunction
Check
supply of
ignition
power
Check
ignition coil
for short
circuit or
open circuit
Check internal
wiring of
ignition system
for short circuit
or open circuit
Check CDI
igniter for
malfunction Use a cylinder
pressure gauge to
check and measure
compression
Check
inside of
fuel tank
for
presence
of
Com
press
ion
press
ure
of
cylin
der
Com
press
ion
press
ure
of
cylin
der
Fill
gasol
ine
No-contact magneto
ignition system
1. Check ignition power
coil for short circuit or
open circuit
2. Check trigger coil for
short circuit or open
circuit
1. Check CDI igniter for
malfunction
2. Check magneto flywheel
and trigger coil for
looseness
Loosen drain screw
on carburetor to
check if gasoline
flows out from
overflow pipe on
carburetor