GAS GAS MC 85 2023, Owner'S Manual

Page: 109 / 176

TROUBLESHOOTING 19
107
Faults Possible cause Action
Engine turns but does not start Operating error
–
Carry out the start procedure. ( p. 24)
Motorcycle was out of use for a
long time and there is old fuel in
the float chamber
–
Empty the carburetor float chamber.
( p. 97)
Fuel supply interrupted
–
Check the fuel tank breather.
–
Clean the fuel tap.
–
Check/adjust the carburetor components.
Spark plug sooty or wet
–
Clean and dry the spark plug and spark
plug connector, or change if necessary.
Plug gap of spark plug too wide
–
Adjust plug gap.
Guideline
Spark plug electrode gap
0.60 mm (0.0236 in)
Fault in ignition system
–
Check the ignition system.
–
Adjust the ignition system.
Short-circuit cable in wiring har-
ness frayed, stop button faulty
–
Check the stop button.
Water in carburetor or jets
blocked
–
Check/set the carburetor components.
The engine has no idle speed Idling jet blocked
–
Check/set the carburetor components.
Adjusting screws on carburetor
distorted
–
Carburetor
–
adjust the idle speed.
( p. 96)
Spark plug defective
–
Change the spark plug.
Ignition system defective
–
Check the ignition coil.
–
Check the spark plug connector.
Engine does not speed up Carburetor running over because
float needle dirty or worn
–
Check/set the carburetor components.
Loose carburetor jets
–
Check/set the carburetor components.
Fault in ignition system
–
Check the ignition system.
–
Adjust the ignition system.
Engine has too little power Fuel supply interrupted
–
Check the fuel tank breather.
–
Clean the fuel tap.
–
Check/adjust the carburetor components.
Air filter is very dirty
–
Clean the air filter and air filter box.
( p. 54)
Exhaust system leaks, deformed
or too little glass fiber yarn filling
in main silencer
–
Check exhaust system for damage.
–
Change the glass fiber yarn filling of the
main silencer. ( p. 55)
Fault in ignition system
–
Check the ignition system.
–
Adjust the ignition system.
Membrane or reed valve housing
is damaged
–
Check the membrane and reed valve hous-
ing.
Engine stalls or is popping into the
carburetor
Lack of fuel
–
Turn tap handle of the fuel tap to the ON
position.
–
Refuel. ( p. 27)
Engine takes in bad air
–
Check intake flange and carburetor for
tightness.
The connector or ignition coil is
loose or oxidized
–
Clean the connector and treat it with con-
tact spray.