Adjusting The Engine Idling Speed; Adjusting The Throttle Grip Free Play - Yamaha TTR 125 2023 Manual

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.
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 4000–5000 r/min.
TIP
The engine is warm when it quickly re-
sponds to the throttle.
3. Check the engine idling speed
and, if necessary, adjust it to
specification by turning the throt-
tle stop screw. To increase the en-
gine idling speed, turn the screw in
Periodic maintenance and adjustment
direction (a). To decrease the en-
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gine idling speed, turn the screw in
direction (b).
1. Throttle stop screw
Engine idling speed:
1300–1500 r/min
TIP
If the specified idling speed cannot be
obtained as described above, have a
Yamaha dealer make the adjustment.
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Adjusting the throttle grip free
play
Measure the throttle grip free play as
shown.
1. Throttle grip free play
Throttle grip free play:
3.0–5.0 mm (0.12–0.20 in)
Periodically check the throttle grip free
play and, if necessary, adjust it as fol-
lows.
TIP
The engine idling speed must be cor-
rectly adjusted before checking and

adjusting the throttle grip free play.

1. Loosen the locknut.
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