8-8
CD-04E
1. Loosen both carburetor clamp screws and turn the
carburetor enough to access the float chamber drain
plug.
2. Clamp the fuel hose to prevent fuel from flowing.
3. Remove the float chamber drain plug, and then install
the correct main jet for ridding conditions.
4. Assemble by reversing the removal steps.
WARNING
@
Make sure that the throttle outer cable is firmly
seated in the holder and the throttle operates
smoothly after assembling the carburetor.
@
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.
Main jet
Mixture
Condition
Small No.
Lean
Warm weather
High altitude
Large No.
Rich
Cold weather
Low altitude
804-029
E_8KX.book Page 8 Friday, April 2, 2021 8:52 AM
