Valve Clearance; Brakes; Checking The Front And Rear Brake Shoes - Yamaha YFM90 2019 Owner's Manual

Periodically check the throttle lever free play and
adjust if necessary.
TIP
The engine idling speed must be checked and ad-
justed before adjusting the throttle lever free play.
1. Slide the rubber cover away from the locknut.
2. Loosen the locknut.
3. To increase the throttle lever free play, turn
the throttle lever free play adjusting nut in di-
rection (a). To decrease the throttle lever free
play, turn the adjusting nut in direction (b).
4. Tighten the locknut.
5. Slide the rubber cover to its original position.
EBU24061
8

Valve clearance

The valve clearance changes with use, resulting in
improper air-fuel mixture and/or engine noise. To
prevent this from occurring, the valve clearance
must be adjusted by a Yamaha dealer at the inter-
vals specified in the periodic maintenance and lu-
brication chart.
EBU29602

Brakes

Replacement of brake components requires pro-
fessional knowledge. Brake service should be
performed by a Yamaha dealer.
EWB02572
WARNING
Operating with improperly serviced or adjust-
ed brakes could lead to a loss in braking ability
and an accident.
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Checking the front and rear brake
shoes
The front and rear brake shoes must be checked
for wear at the intervals specified in the periodic
maintenance and lubrication chart. Without disas-
sembling the brake, this can be performed by
checking the position of the brake lever free play
adjusting bolts or nut.
Front brakes
To check front brake shoe wear, check the posi-
tion of the adjusting bolts. If a bolt extends more
than 12 mm (0.47 in) from its locknut, the brake
shoes need to be replaced.
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