4-10 FUEL AND LUBRICATION SYSTEM
CARBURETION
Proper carburetion is determined by several interrelated factors (i.e. engine power, fuel consumption, fuel
cooling ability, jet settings etc.). Therefore, the jet size and the positions of any adjustable parts should not be
changed from the original settings.
Changes should only be made when adjusting for differences in altitude or other climatic conditions. When
adjustment is necessary, refer to the following chart.
AIR/FUEL MIXTURE RATIO CAN BE CHANGED AS FOLLOWS:
Throttle opening Method of changing ratio Standard setting
Slight Air screw
Larger number: richer mixture
Smaller number: leaner mixture
Medium Jet needle
Richer
Leaner
• 1
##
##
# turns out
1st
Leaner
Richer
5th
• 3E3-4th
High Main jet
• #55
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