Adjusting The Throttle Grip Free Play; Valve Clearance - Yamaha MTM155 Owner's Manual

Periodic maintenance and adjustment
Adjusting the throttle grip free
play
Measure the throttle grip free play as
shown.
1. Throttle grip free play
7
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.
EAU21377 2. To increase the throttle grip free
play, turn the throttle grip free play
adjusting nut in direction (a). To
decrease the throttle grip free
play, turn the adjusting nut in di-
rection (b).
1
1. Locknut
2. Adjusting nut
3. Tighten the locknut.

Valve clearance

The valves are an important engine
component, and since valve clearance
changes with use, they must be
checked and adjusted at the intervals
specified in the periodic maintenance
chart. Unadjusted valves can result in
1
2
improper
(a)
noise, and eventually engine damage.
To prevent this from occurring, have
your Yamaha dealer check and adjust
(b)
the valve clearance at regular intervals.
TIP
This service must be performed when
the engine is cold.
7-16
EAU21403
air-fuel mixture, engine