Snowmobile Yamaha RX1 (2003 year). Manual - part 9

6-4

ESU00086 

Coolant

Check the coolant level in the coolant reservoir when the
engine is cold. If the coolant level is below the
“COLD LEVEL” mark, add soft water until it reaches the
“COLD LEVEL” mark. (See pages 8-13–8-14 for more
details.)

1 “COLD LEVEL” mark

WARNING

@ 

Do not remove the coolant reservoir cap when the
engine is hot. 

@

CAUTION:

@ 

●

Hard water or salt water is harmful to the engine
parts. You may use boiled or distilled water, if soft
water is not available. 

●

Tap water can be used temporarily in an emer-
gency. 

@

6-5

ESU00087 

Throttle lever

Check the throttle lever operation before starting the
engine. 
The throttle lever must open smoothly and spring back to
its home position when released. 

ESU00090 

Throttle override system (T.O.R.S.) 

Check the T.O.R.S. for proper operation.

WARNING

@ 

When checking T.O.R.S.: 

●

Make sure that the parking brake is applied. 

●

Make sure that the throttle lever moves smoothly. 

●

Do not run the engine up to clutch engagement
r/min. Otherwise, the snowmobile could start
moving forward unexpectedly, which could cause
an accident. 

@

1. Start the engine.

NOTE:

@ 

Refer to the “Starting the engine” section. 

@

2. Hold the pivot point of the throttle lever away from the

throttle switch by putting your thumb (above) and
forefinger (below) between the throttle lever pivot 

1

and the engine stop switch housing 

2. 

While holding the pivot point as described above,
press the throttle lever 

3 gradually. 

The T.O.R.S. will operate and the engine should run
between 2,800 and 3,000 r/min.

WARNING

@ 

If the engine does not run between 2,800 and
3,000 r/min, stop the engine by turning the main switch
to the “OFF” position and consult a Yamaha dealer. 

@

6-6

ESU00091 

Brake

1. Brake lever 

Test the brake at a low speed when starting out to
make sure that it is working properly. If the brake
does not provide proper braking performance,
inspect the brake for wear or brake fluid leakage.
(See pages 8-19–8-20 for more details.)

WARNING

@ 

●

A soft, spongy feeling in the brake lever indicates
a failure in the brake system. 

●

Do not operate the snowmobile if you find any
problems in the brake system. You could lose
braking ability, which could lead to an accident.
Ask a Yamaha dealer to inspect and repair the
brake system. 

@

CAUTION:

@ 

Make sure that the brake lever end does not project
out over the handlebar end. This is to prevent brake
lever damage when the snowmobile is placed on its
side. 

@

2. Brake fluid 

Check the brake fluid level. (See page 8-20.) 
Add fluid if necessary.

1 Lower level

Specified brake fluid: DOT 4 

6-7

ESU00093

Brake fluid leakage

Apply the brake for a few minutes. Check to see if any
brake fluid leaks out from the brake hose joints or the
master cylinder.

WARNING

@ 

If brake fluid leakage is found, ask a Yamaha dealer
for immediate repairs. 

@

CAUTION:

@ 

Brake fluid may deteriorate painted surfaces or plas-
tic parts. Never spill any brake fluid. If any is spilled,
clean it up immediately. 

@ 

ESU00094 

V-belt

Open the shroud and remove the drive guard. 
Check the V-belt for wear and damage. Replace if neces-
sary.

WARNING

@ 

●

Make sure that the drive guard is tightened
securely before operating the snowmobile. 

●

Never run the engine without the V-belt or with
the drive guard removed. 

@ 

ESU00096 

Drive guard

Check the drive guard mounts for damage. Make sure
that the drive guard is firmly in place.

Wear limit 

a: 32.5 mm (1.28 in)