PERIODIC MAINTENANCE AND MINOR REPAIR
1. Air intake duct
Air intake duct
Check that the screen of the intake
duct is not blocked. Clean the screen if
necessary.
6
Adjusting the carburetors
The carburetors are important parts of
the engine and require very sophisti-
cated adjustment. Therefore, most car-
buretor adjustments should be left to a
Yamaha dealer, who has the neces-
sary professional knowledge and expe-
rience. The adjustment described in
the following section, however, may be
serviced by the owner as part of routine
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maintenance.
CAUTION:
@
The carburetors have been set and
extensively tested at the Yamaha
factory. Changing these settings
without sufficient technical knowl-
edge may result in poor perfor-
mance of or damage to the engine.
@
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1. Throttle stop screw
Adjusting the engine idling
speed
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The engine idling speed must be
checked and, if necessary, adjusted as
follows at the intervals specified in the
periodic maintenance and lubrication
chart.
1. Start the engine and warm it up
NOTE:
@
The engine is warm when it quickly re-
sponds to the throttle.
@
6-21
for several minutes at 1,000–
2,000 r/min while occasionally
revving it to 4,000–5,000 r/min.
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