Troubleshooting - Yamaha VK540V Owner's Manual

ESU02653*
T ROUBLESHOOTING
1 -
A. Engine turns over but does not start
1. Fuel system
No fuel supplied to combustion cham-
ber
● No fuel in tank ... Supply fuel.
●
Clogged fuel line ... Clean fuel line.
● Clogged carburetor ... Clean carbure-
tor.
●
Fuel supplied to combustion chamber
● Flooded engine (too much choke) ...
Crank engine with throttle open or wipe
the spark plugs dry.
2. Electrical system
Poor or no spark
●
Spark plugs are dirty with carbon or are
wet ... Remove carbon or wipe the
spark plugs dry; replace if necessary.
● Faulty ignition system ... Ask a Yamaha
dealer to inspect.
● T.O.R.S. system malfunction ... Discon-
nect the carburetor switch connectors
and connect the wire harness connec-
tors together to bypass the T.O.R.S.
WARNING
@
● Before bypassing the T.O.R.S., make
sure that the throttle returns prop-
erly to the fully-closed position.
● 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.
@
816-041
3. Compression
Insufficient
● Loose cylinder head nuts ... Tighten
nuts properly.
● Worn or damaged gasket ... Replace
gasket.
● Worn or damaged piston and cylinder
... Ask a Yamaha dealer to inspect.
B. Engine does not turn over with the recoil
starter
1. Seized engine ... Seizure is caused by
poor lubrication, inadequate fuel, or an
air leak—Ask a Yamaha dealer to
inspect.
2. "Hydrolock" occurs when fuel has filled
the crankcase when the vehicle has
been transported. ... Remove the spark
plugs and turn the engine over several
times with the ignition off to expel
excess fuel. Ask a Yamaha dealer to
inspect.
C. Electric starter does not operate or oper-
ates slowly
1. Faulty wire connections ... Check con-
nections or ask a Yamaha dealer to
inspect.
2. Discharged battery... Check battery
fluid and charge battery.
3. Engine trouble ... Check B above.
D. Engine power is low
1. Faulty spark plugs ... Clean or replace
the spark plugs.
2. Incorrect jetting for altitude or tempera-
ture ... Carburetor. Ask a Yamaha
dealer to inspect.
3. Improper fuel flow ... See A.1. above.
4. Incorrect V-belt clutch settings for alti-
tude or conditions ... Ask a Yamaha
dealer to inspect.
9-1