Yamaha WR250F 2016 Owner's Service Manual page 105

ITEM
PISTON PIN
Inspect
Replace
CYLINDER HEAD
Inspect and clean
CYLINDER
Inspect and clean
Replace
CLUTCH
Inspect and adjust
Replace
TRANSMISSION
Inspect
Replace bearing
SHIFT FORK, SHIFT
CAM, GUIDE BAR
Inspect
ROTOR NUT
Retighten
MUFFLER
Inspect and re-
tighten
Clean
Replace
CRANK
Inspect and clean
THROTTLE BODY
Inspect
SPARK PLUG
Inspect and clean
Replace
DRIVE CHAIN
Lubricate, slack,
alignment
Replace
Every
After third
Every
break- (or
race
in 500
km)
PERIODIC MAINTENANCE
Every
fifth
As re-
(or
quired
1,000
km)
3-5
Remarks
Inspect carbon deposits and
eliminate them.
Change gasket.
Inspect score marks.
Inspect wear.
Inspect housing, friction plate,
clutch plate and spring.
Inspect wear.
Use chain lube.
Chain slack: 50–60 mm
(1.97–2.36 in)