19 Troubleshooting - GAS GAS MC 125 2022 Owner's Manual

19 TROUBLESHOOTING

Faults
Engine turns but does not start
Engine has no idle speed
Engine does not speed up
Engine has too little power
Engine stalls or is popping into the
carburetor
110
Possible cause
Operating error
The motorcycle has been in disuse
for an extended period and old
fuel is in the float chamber
Fuel supply interrupted
Spark plug sooty or wet
Plug gap of spark plug too wide
Fault in ignition system
Short-circuit cable in wiring har-
ness frayed, stop button faulty
The connector or ignition coil is
loose or oxidized
Water in carburetor or jets
blocked
Idling jet blocked
Adjusting screws on carburetor
distorted
Spark plug defective
Ignition system defective
Carburetor running over because
float needle dirty or worn
Loose carburetor jets
Fault in ignition system
Fuel supply interrupted
Air filter very dirty
Exhaust system leaky, deformed
or too little glass fiber yarn filling
in main silencer
Fault in ignition system
Diaphragm or reed valve housing
damaged
Lack of fuel
Engine takes in bad air
The connector or ignition coil is
loose or oxidized
Action
–
Carry out start procedure. (
–
Empty the carburetor float chamber.
( p. 102)
–
Check the fuel tank breather.
–
Clean the fuel tap.
–
Check/adjust the carburetor components.
–
Clean and dry the spark plug and spark
plug connector, or change if necessary.
–
Adjust plug gap.
Guideline
Spark plug electrode gap
0.60 mm (0.0236 in)
–
Check the ignition system.
–
Check the stop button.
–
Clean the connector and treat it with con-
tact spray.
–
Check/set the carburetor components.
–
Check/set the carburetor components.
–
Carburetor - adjust the idle speed.
( p. 99)
–
Change the spark plug.
–
Check the ignition coil.
–
Check the spark plug connector.
–
Check/set the carburetor components.
–
Check/set the carburetor components.
–
Check the ignition system.
–
Check the fuel tank breather.
–
Clean the fuel tap.
–
Check/adjust the carburetor components.
–
Clean the air filter and air filter box.
( p. 56)
–
Check exhaust system for damage.
–
Change the glass fiber yarn filling in the
main silencer. ( p. 58)
–
Check the ignition system.
–
Check the diaphragm and reed valve hous-
ing.
–
Turn the knurled screw on the fuel tap all
the way counterclockwise.
–
Refuel. ( p. 28)
–
Check the intake flange and carburetor for
tightness.
–
Clean the connector and treat it with con-
tact spray.
p. 25)