EAU00462PERIODIC MAINTENANCE AND MINOR REPAIR
EAU00630
Adjusting the carburetors
The carburetors are important parts of the
engine and require very sophisticated ad-
justment. Therefore, most carburetor ad-
justments should be left to a Yamaha deal-
er, who has the necessary professional
knowledge and experience. The adjust-
ment described in the following section,
however, may be serviced by the owner as
part of routine maintenance.
EC000095
The carburetors have been set and
extensively tested at the Yamaha facto-
ry. Changing these settings without
sufficient technical knowledge may
result in poor performance of or dam-
age to the engine.
CAUTION:
EAU01168
Adjusting the engine idling
speed
The engine idling speed must be checked
and, if necessary, adjusted as follows at
the intervals specified in the periodic main-
tenance and lubrication chart.
NOTE:
A diagnostic tachometer is needed to
make this adjustment.
1. Attach the tachometer to the spark
plug lead.
2. Start the engine and warm it up for
several minutes at 1,000-2,000 r/min
while occasionally revving it to
4,000-5,000 r/min.
NOTE:
The engine is warm when it quickly
responds to the throttle.
6-12
6
1
2
1. Pin (x 2)
2. Pin seat (x 2)
EWA00052WARNING0
Before installing the fuel tank, make
sure that the fuel hoses are not dam-
aged. If any fuel hose is damaged, do
not start the engine but have a Yamaha
dealer replace the hose, otherwise fuel
may leak.
Make sure that the fuel hoses are prop-
erly connected and routed, and not
pinched.
Be sure to place the fuel tank breather
hose in the original position.
12. Install the seat.
