Yamaha VK PROFESSIONAL-II 2016 Owner's Manual page 84

Troubleshooting
7. Pull the black (–) connecting lead cover
to expose the terminal through the slit in
the cover, and then connect the black (–)
jumper cable to the black (–) connecting
lead.
8. Start the engine.
9. Disconnect the black (–) jumper cable
from the black (–) connecting lead, and
then pull the cover completely over the
lead terminal.
10. Disconnect the black (–) jumper cable
from the negative (–) terminal of the bat-
tery used to jump-start the engine.
11. Disconnect the red (+) jumper cable from
the positive (+) terminal of the battery
used to jump-start the engine.
12. Disconnect the red (+) jumper cable from
the red (+) connecting lead, and then pull
the cover completely over the lead termi-
nal.
13. Install the red (+) connecting lead into the
lead holder.
14. Close the shroud.
76
TIP
Make sure that both the red (+) connecting
lead and the black (–) connecting lead are
seated securely in the lead holders.
Electric starter does not operate or
operates slowly
 Engine stop switch is pushed in: Pull it out.
 Faulty wire connections: Check connec-
tions or ask a Yamaha dealer to check.
 Discharged battery: Charge battery or see
"Discharged battery" above.
 Seized engine: Seizure is caused by poor
lubrication, inadequate fuel, or an air leak.
Ask a Yamaha dealer to check.
Engine power is low
 Low coolant temperature indicator light is
flashing: Warm engine up.
 Faulty spark plugs: Clean or replace spark
plugs.
 Improper fuel flow: See "Engine turns over
but does not start–Fuel system" above.
 Incorrect V-belt clutch settings for altitude
or conditions: Ask a Yamaha dealer to
check.
Engine constantly backfires or mis-
fires
 Faulty spark plugs: Replace spark plugs.
 Clogged fuel system: See "Engine turns
over but does not start–Fuel system"
above.
 Malfunctioning T.O.R.S.: See "Engine turns
over but does not start–Electrical system"
above.
Engine overheats
 Insufficient coolant: Add coolant.
 Air in cooling system: Bleed cooling system
or ask a Yamaha dealer to check.
 Leaking coolant: Ask a Yamaha dealer to
check.