Adjusting The Carburetor; Adjusting The Engine Idling; Speed - Yamaha TT-R125Y Owner's Manual

1. Remove the spark arrester cap by
removing the bolts, and then pulling
the spark arrester out of the muffler.
2.Tap the spark arrester lightly, and
then use a wire brush to remove
any carbon deposits, then clean the
inside of the spark arrester.
1. Spark arrester cap bolts
3. Insert the spark arrester into the
muffler, install the spark arrester
cap and the bolts, and then tighten
the bolts to the specified torque.
Tightening torque:
Spark arrester cap bolts:
10 Nm (1.0 m.kgf, 7.2 ft.lbf)
TIP
Make sure to align the bolt holes when
installing the spark arrester cap.
PERIODIC MAINTENANCE AND ADJUSTMENT

Adjusting the carburetor

The carburetor is an important part of
the engine and requires very
sophisticated adjustment. Therefore,
most carburetor adjustments should be
left to a Yamaha dealer, who has the
necessary professional knowledge and
experience. The adjustment described
in the following section, however, may
be serviced by the owner as part of
routine maintenance.
NOTICE
The carburetor has been set and
extensively tested at the Yamaha
factory. Changing these settings
without sufficient
knowledge may result in poor
performance 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 lubrication
chart.
TIP
A diagnostic tachometer is needed to
make this adjustment.
ECA10550
1. Attach the tachometer to the spark
plug lead.
2. Start the engine and warm it up for
several minutes at 1000-2000 r/min
while occasionally revving it to
technical
4000-5000 r/min.
TIP
The engine is warm when it quickly
responds to the throttle.
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