Snowmobile Yamaha RX1 (2003 year). Instruction - part 15

 

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Snowmobile Yamaha RX1 (2003 year). Instruction - part 15

 

 

8-7

ESU00369

Carburetor adjustment

CAUTION:

Be sure to have a Yamaha dealer make this
adjustment. 

Make sure that the air filter case is installed dur-
ing running to prevent engine damage. 

@

Under some operating conditions the carburetor setting
may have to be changed due to air temperature changes,
elevation changes, use of alcohol oxygenated fuels, etc.,
and should be set by a Yamaha dealer.

CAUTION:

The drive chain gears and V-belt clutch should be
adjusted when operating over a high altitude of
900 m (3,000 ft). Consult a Yamaha dealer. 

@

Pilot screw adjustment 
Turn the pilot screw in or out to adjust low speed tuning.

CD-02E

Standard pilot screw position: 

2 turns out from the seated position. 

Pilot screw 

1

Mixture

Condition

Turn in

Lean

Warm weather

High altitude

Turn out

Rich

Cold weather

Low altitude

8-8

Jet needle adjustment
Adjust the jet needle by changing its clip position accord-
ing to the setting chart which is available at a Yamaha
dealer.

CD-03E

1. Remove the top cover of the carburetor and jet nee-

dle. 

2. Change the clip to the proper position. Make sure

that the plastic washer is in place below the clip.

WARNING

Make sure that the throttle outer cable is firmly
seated in the holder and the throttle operates
smoothly after assembling the carburetor. 

@

3. Assemble by reversing the removal steps.

Main jet replacement
Replace the main jet according to the setting chart which
is available at a Yamaha dealer.

WARNING

Never remove the drain plug or the float chamber
while the engine is hot. Fuel will flow out from the
float chamber which could ignite and cause
injury. 

Place a rag under the carburetor before removing
the drain plug or float chamber to catch any
spilled fuel. 

Handle fuel with care: it is HIGHLY FLAMMABLE. 

@

Standard jet needle clip 

1 position: 

3rd groove from upper end

Clip position

Mixture

Condition

2 Upper end

Lean

Warm weather

High altitude

3 Lower end

Rich

Cold weather

Low altitude

8-9

CD-04E

1. Loosen the carburetor clamps and remove all hoses

and cables, and then remove the carburetor. 

2. Pinch the fuel hose to prevent fuel flowing. 
3. Remove the float chamber and install the proper

main jet. 

4. Assemble by reversing the removal steps.

WARNING

Make sure that all hoses and clamps are properly
installed. 

Standard main jet: 

# 135

Main jet 

1

Mixture

Condition

Small No.

Lean

Warm weather

High altitude

Large No.

Rich

Cold weather

Low altitude

8-10

ESU00157 

High altitude adjustments

Operating at high altitude reduces the performance of a
gasoline engine to about 3% for every 305 m (1,000 ft) of
elevation. This is because there is less air as altitude
increases. Less air means less oxygen available for com-
bustion.
Your snowmobile can be adjusted to overcome most of
the problems found in high altitude riding. Carburetor
adjustments are the most important. Less air at high alti-
tude makes the air/fuel ratio too rich, which can cause
poor performance. Common problems are hard starting,
bogging, and plug fouling. Follow the Main Jet Setting
chart which is available at a Yamaha dealer carefully.
Proper carburetion adjustments will correct the air/fuel
ratio.

Remember: less air at higher altitude means there is
less horsepower available, even with proper carburetion.
Expect acceleration and top speed to be reduced at
higher altitudes.

To overcome operating with less power at high altitudes,
your snowmobile may also require different settings for
the drive chain gears and V-belt clutch to avoid poor per-
formance and rapid wear. If you plan to operate your
snowmobile at an altitude different from the area where
you bought it, be sure to consult a Yamaha dealer. They
can tell you if there are any changes necessary for the
altitude where you plan to ride.

CAUTION:

The drive chain gears and V-belt clutch should be
adjusted when operating over a high altitude of
900 m (3,000 ft). Consult a Yamaha dealer. 

@

ESU00348

Adjusting the valve clearance

The valve clearance changes with use, resulting in
improper air-fuel mixture and/or engine noise. To prevent
this from occurring, the valve clearance must be adjusted
by a Yamaha dealer at the intervals specified in the peri-
odic maintenance chart.

 

 

 

 

 

 

 

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