Periodic maintenance and adjustment
seated in the air filter case. The
engine should never be operat-
ed without the air filter element
installed, otherwise the pis-
ton(s) and/or cylinder(s) may
become
excessively
[ECA10482]
6. Install the air filter case cover by
installing the screws.
7. Install the seats.
To clean the air filter check hose
1. Remove the air filter check hose
under the air filter case.
7
1. Air filter check hose
2. Remove the hose, clean it, and
then install it in its original position.
Checking the throttle grip free
play
Measure the throttle grip free play as
shown.
worn.
1. Throttle grip free play
1
Throttle grip free play:
3.0–5.0 mm (0.12–0.20 in)
Periodically check the throttle grip free
play and, if necessary, have a Yamaha
dealer adjust it.
EAU21386
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
improper
noise, and eventually engine damage.
To prevent this from occurring, have
your Yamaha dealer check and adjust
1
the valve clearance at regular intervals.
TIP
This service must be performed when
the engine is cold.
7-18
EAU21403
air-fuel
mixture,
engine