20 Troubleshooting - GAS GAS TXT Racing 125 2020 Owner's Manual

20 TROUBLESHOOTING

Faults
Engine does not start
The engine has no idle speed
Engine has too little power
The engine stutters or there is
backfiring through the carburetor
98
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
Magnetic switch cable in the
wiring harness chafed; magnetic
switch defective
Connector or ignition coil loose or
oxidized
Water in carburetor or jets
blocked
Idling jet blocked
Adjusting screws on the carbu-
retor are in turned to the wrong
position
Faulty spark plug
Faulty ignition
Fuel supply interrupted
Air filter is very dirty
Exhaust system leaking or
deformed
Fault in ignition system
Damaged membrane or reed valve
housing
Lack of fuel
The engine takes in false air
Connector or ignition coil loose or
oxidized
Action
–
Carry out start procedure. (
–
Empty the carburetor float chamber.
( p. 91)
–
Check the fuel tank breather.
–
Clean the fuel tap.
–
Check/adjust the carburetor components.
–
Clean and dry the spark plug, or change it
if necessary.
–
Adjust plug gap.
Guideline
Spark plug gap
0.7 ... 0.8 mm (0.028 ... 0.031 in)
–
Check the ignition system.
–
Check magnetic switch.
–
Clean the connector and treat with con-
tact spray.
–
Check/adjust the carburetor components.
–
Check/adjust the carburetor components.
– Carburetor – adjust the idle speed.
( p. 89)
–
Change the spark plug.
–
Check the ignition coil.
–
Check the spark plug connector.
–
Check the fuel tank breather.
–
Clean the fuel tap.
–
Check/adjust the carburetor components.
–
Clean the air filter and air filter box.
( p. 50)
–
Check exhaust system for damage.
–
Check the ignition system.
–
Check the membrane and reed valve hous-
ing.
–
Turn tap handle of the fuel tap to the ON
position.
–
Turn tap handle of the fuel tap to the RES
position.
–
Refuel. ( p. 26)
–
Check the intake flange and carburetor for
firm seating.
–
Clean the connector and treat with con-
tact spray.
p. 23)