Adjusting The Carburetor; Adjusting The Engine Idling Speed - Yamaha TW125 Owner's Manual

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1. Air filter check hose
To clean the air filter check hose
1. Check the hose at the bottom of
the air filter case for accumulated
dirt or water.
2. If dirt or water is visible, remove
the hose, clean it, and then
install it.
PERIODIC MAINTENANCE AND MINOR REPAIR

Adjusting the carburetor

The carburetor is an important part of
the engine and requires very sophisti-
cated adjustment. Therefore, most
carburetor adjustments should be left
to a Yamaha dealer, who has the
necessary professional knowledge
and experience. The
described in the following section,
however, may be serviced by the
owner as part of routine mainte-
nance.
cC
The carburetor has 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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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 maintenance and lubrica-
tion chart.
adjustment
NOTE:
A diagnostic tachometer is needed to
make this adjustment.
1. Attach the tachometer to the
EC000094
spark plug lead.
2. Start the engine and warm it up
for
1,000–2,000 r/min while occa-
sionally revving it to 4,000–5,000
r/min.
NOTE:
The engine is warm when it quickly
responds to the throttle.
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several minutes at
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