2006 Yamaha Motorsports VK Professional Owners Manual - Page 63

2006 Yamaha Motorsports VK Professional Manual

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Page 63 highlights

ESU04870 Adjusting the carburetors The carburetors are an important part of the engine and its emission control system, which require very sophisticated adjustment. Therefore, carburetor adjustments should be left to a Yamaha dealer, who has the necessary professional knowledge and experience. ESU01571 Adjusting the high altitude settings 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. 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 performance 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. @ 8-8

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8-8
ESU04870
Adjusting the carburetors
The carburetors are an important part of the engine and
its emission control system, which require very sophisti-
cated adjustment. Therefore, carburetor adjustments
should be left to a Yamaha dealer, who has the neces-
sary professional knowledge and experience.
ESU01571
Adjusting the high altitude settings
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 accelera-
tion 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.
@