2002 Yamaha Motorsports Vmax 700 ER Owners Manual - Page 61

2002 Yamaha Motorsports Vmax 700 ER Manual

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Standard main jet: 1 No.1 Carburetor (P.T.O. side) # 145 2, 3 No.2 and No.3 Carburetors (center and magneto side) # 143.8 CD-04E Main jet 4 Mixture Lean Rich Condition Warm weather High altitude Cold weather Low altitude Small No. Large No. 1. Loosen the carburetor clamps and remove the carburetor. 2. Pinch the fuel hose to prevent fuel flowing. 3. Remove the drain plug and install the proper main jet. 4. Assemble by reversing the removal steps. WARNING @ Make sure that the throttle outer cable is firmly seated in the holder and throttle operates smoothly after assembling the carburetor. @ 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 combustion. 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 altitude 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. 8-9

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8-9
CD-04E
1. Loosen the carburetor clamps and remove the carbu-
retor.
2. Pinch the fuel hose to prevent fuel flowing.
3. Remove the drain plug and install the proper main jet.
4. Assemble by reversing the removal steps.
WARNING
@
Make sure that the throttle outer cable is firmly
seated in the holder and throttle operates smoothly
after assembling the carburetor.
@
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.
Standard main jet:
1
No.1 Carburetor (P.T.O. side)
# 145
2
,
3
No.2 and No.3 Carburetors (center and magne-
to side)
# 143.8
Main jet
4
Mixture
Condition
Small No.
Lean
Warm weather
High altitude
Large No.
Rich
Cold weather
Low altitude