Yamaha RS90NL Owner's Manual page 94

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
booster battery.
11. Disconnect the red (+) jumper cable
from the positive (+) terminal of the
booster battery.
12. Disconnect the red (+) jumper cable
from the red (+) connecting lead, and
then pull the cover completely over the
lead terminal.
13. Install the red (+) lead into the lead
holder.
NOTE:
@
Make sure that both the red (+) lead and
the black (-) lead are seated securely in the
lead holders.
@
WARNING
@
Be sure to pull the lead covers back
over the terminals completely. If the ter-
minals are exposed, they could come
into contact with the frame or a metal
part of the snowmobile and this can
cause electrical system damage or A
FIRE HAZARD.
@
C. Electric starter does not operate or
operates slowly
1. Engine stop switch is pushed in ... Pull
it out.
2. Faulty wire connections ... Check con-
nections or ask a Yamaha dealer to
inspect.
3. Discharged battery... Charge battery or
see B above.
4. Seized engine ... Seizure is caused by
poor lubrication, inadequate fuel, or an
air leak—Ask a Yamaha dealer to
inspect.
5. "Hydrostatic lock" occurs when fuel has
filled the cylinders 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.
D. Engine power is low
1. Low coolant temperature indicator light
is flashing ... Warm the engine up.
2. Faulty spark plugs ... Clean or replace
the spark plugs.
3. Incorrect jetting for altitude or tempera-
ture ... Carburetor. Ask a Yamaha
dealer to inspect.
4. Improper fuel flow ... See A.1 above.
5. Incorrect V-belt clutch settings for alti-
tude or conditions ... Ask a Yamaha
dealer to inspect.
E. Engine constantly backfires or mis-
fires
1. Faulty spark plugs ... Replace the
spark plugs.
2. Clogged fuel system ... See A.1. above.
3. Malfunctioning T.O.R.S. system ... See
A.2. above.
F. Engine overheats
1. Insufficient coolant ... Add coolant.
2. Air in cooling system ... Bleed air or ask
a Yamaha dealer to inspect.
3. Leaking coolant ... Ask a Yamaha
dealer to inspect.
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