Snowmobile Yamaha RX1 (2003 year). Manual - part 14

8-3

NOTE:

@ 

Brake fluid replacement: 

1. When disassembling the master cylinder or caliper cylinder, replace the brake fluid.

Normally check the brake fluid level and add the fluid as required. 

2. On the inner parts of the master cylinder and caliper cylinder, replace the oil seals

every two years. 

3. Replace the brake hose every four years, or if cracked or damaged. 

@ 

∗ Primary and second-

ary clutches

Check engagement and shift 
speed.
Adjust if necessary.

●

Whenever operating elevation is changed.

Inspect sheaves for wear/
damage.
Inspect weights/rollers and 
bushings for wear-for primary.
Inspect ramp shoes/bushings 
for wear-for secondary.
Replace if necessary.

●

Lubricate with specified 
grease.

●

∗ Steering column 

bearing

Lubricate with specified 
grease.

●

8-30

∗ Ski and front 

suspension

Lubricate with specified 
grease.

●

8-30

∗ Suspension 

component

Lubricate with specified 
grease.

●

8-30

∗ Parking brake cable 

end and lever end/
throttle cable end

Lubricate with specified 
grease.

●

8-30

Check cable damage.
Replace if necessary.

●

Shroud latches

Make sure that the shroud 
latches are hooked.

●

5-12

Fittings and fasteners

Check tightness.
∗ Repair if necessary.

●

6-10

Tool kit and recom-
mended equipment

Check for proper placement.

●

6-10

Item

Remarks

Pre-

operation 

check 

(Daily)

Initial

1 month 

or 

800 km 

(500 mi) 

(40 hr)

Every

Page

Seasonally 

or 

3,200 km 

(2,000 mi) 

(160 hr)

∗ It is recommended that these items be serviced by a Yamaha dealer.

8-4

ESU00376

Tool kit

The owner’s tool kit has the tools which are sufficient for
most periodic maintenance and minor repair. A torque
wrench is also necessary to properly tighten nuts and
bolts.

1 Tool kit

CAUTION:

@ 

Before starting the engine, make sure that the tool
kit is firmly seated in the holder and is closed
securely. 

@

NOTE:

@ 

If you do not have a torque wrench available during a
service operation requiring one, take your snowmobile to
a Yamaha dealer to check the torque settings and adjust
them if necessary. 

@

ESU00368

Spark plug inspection

The spark plug is an important engine component and is
easy to inspect. The condition of the spark plug can indi-
cate the condition of the engine. Check the coloration on
the white porcelain insulator around the center electrode.
The ideal coloration at this point is a medium to a light
tan color for a snowmobile that is being ridden normally.
If a spark plug shows a distinctly different color, there
could be something wrong with the engine. For example,
a very white center electrode porcelain color could indi-
cate an intake track air leak or carburetion problem for
that cylinder. Do not attempt to diagnose such problems
yourself. Instead, take the snowmobile to a Yamaha
dealer for inspection and possible repairs. You should
periodically remove and inspect the spark plug because
heat and deposits will cause a spark plug to slowly break
down and erode. Consult a Yamaha dealer before chang-
ing to a different type of spark plug.

Specified spark plug: 

· R · CR9E (NGK) or CR9E (NGK)

8-5

Spark plugs are produced in several different thread
lengths. The thread length or reach is the distance from
the spark plug gasket seat to the end of the threaded
portion. If the reach is too long, overheating and engine
damage may result. If the reach is too short, spark plug
fouling and poor performance may result. Also, if the
reach is too short, carbon will form on the exposed
threads resulting in combustion chamber hot spots and
thread damage. Always use a spark plug with the speci-
fied reach.

Before installing any spark plug, measure the electrode
gap with a wire thickness gauge and adjust to specifica-
tion.

When installing the spark plug, always clean the gasket
surface. Wipe off any grime from the threads and tighten
the spark plug to the specified torque.

CAUTION:

@ 

Make sure that the spark plug caps are securely
installed. Otherwise the spark plug caps could be
damaged due to engine vibration. 

@

Spark plug reach 

a: 19.0 mm (0.75 in)

Spark plug gap 

b: 0.7–0.8 mm (0.028–0.031 in)

Spark plug tightening torque: 

12.5 Nm (1.25 m·kgf, 9 ft·lb)

8-6

ESU00370

Engine idle speed adjustment

CAUTION:

@ 

●

Be sure to have a Yamaha dealer make this
adjustment. 

●

Make sure that the throttle lever moves smoothly. 

●

Make sure that the carburetor is synchronized
first. 

@

1. Start the engine and warm it up.

NOTE:

@ 

Refer to the “Starting the engine” section. 

@

2. Turn the throttle stop screw 

1 in or out to adjust the

engine idle speed.

ESU00147

Throttle cable adjustment

CAUTION:

@ 

Be sure to adjust the engine idle speed first. 

@

1. Loosen the locknut.
2. Turn the adjuster in or out until the proper throttle

lever free play is achieved.

1 Locknut 
2 Adjuster

3. Tighten the locknut.

Standard engine idle speed: 1,350 

± 100 r/min

Throttle lever free play 

a: 

2.0–3.0 mm (0.08–0.12 in)