Troubleshooting - Yamaha PZ50W Owner's Manual

ESU05380
T ROUBLESHOOTING
9 -
A. Engine turns over but does not start
1. Fuel system
No fuel supplied to combustion cham-
ber
G No fuel in tank ... Supply fuel.
G Clogged fuel line ... Clean fuel line.
G Clogged injector ... Ask a Yamaha
dealer to inspect.
Fuel supplied to combustion chamber
G
Flooded engine (too much choke) ...
Crank engine with throttle open or wipe
the spark plugs dry.
2. Electrical system
Poor or no spark
G
Spark plugs are dirty with carbon or are
wet ... Remove carbon or wipe the
spark plugs dry; replace if necessary.
G Faulty ignition system ... Ask a Yamaha
dealer to inspect.
G
T.O.R.S. malfunction ... Disconnect the
throttle switch connectors and connect
the wire harness connectors together
to bypass the T.O.R.S.
WARNING
@
G Before bypassing the T.O.R.S., make
sure that the throttle returns prop-
erly to the fully closed position.
G
The T.O.R.S. is an important safety
device; in the case of a malfunction,
take the snowmobile to a Yamaha
dealer immediately for repair.
@
3. Compression
Insufficient
G Loose cylinder head nuts ... Tighten
nuts properly.
G Worn or damaged gasket ... Replace
gasket.
G
Worn or damaged piston and cylinder
... Ask a Yamaha dealer to inspect.
B. Starting the engine with a dis-
charged battery
If the snowmobile battery is discharged,
the engine can be started using a 12-volt
battery and jumper cables.
WARNING
@
G Connect the jumper cables only to
the battery terminals. Do not con-
nect them to the frame or any wire or
other lead.
G
When connecting the jumper cables,
do not contact the jumper cables to
each other or to the frame or any
metal part of the snowmobile. This
can cause electrical system dam-
age or A FIRE HAZARD.
@
1. Apply the parking brake and turn the
main switch off.
2. Remove the right side cover. (See
pages 8-5–8-8 for removal proce-
dures.)
3. Connect the red (+) jumper cable to the
positive (+) terminal of the discharged
battery.
4. Connect the other end of the red (+)
jumper cable to the positive (+) terminal
of the booster battery.
5. Connect the black (-) jumper cable to
the negative (-) terminal of the booster
battery.
6. Connect the other end of the black (-)
jumper cable to the negative (-) termi-
nal of the discharged battery.
9-1