Yamaha YZ250F 2008 Owner's Service Manual page 16

Tool name/Part number
Timing light
YM-33277-A, 90890-03141
Valve spring compressor
YM-4019, 90890-04019
Clutch holding tool
YM-91042, 90890-04086
Valve guide remover
Intake 4.0 mm (0.16 in)
Exhaust 4.5 mm (0.18 in)
YM-4111, 90890-04111
YM-4116, 90890-04116
Valve guide installer
Intake 4.0 mm (0.16 in)
Exhaust 4.5 mm (0.18 in)
YM-4112, 90890-04112
YM-4117, 90890-04117
Valve guide reamer
Intake 4.0 mm (0.16 in)
Exhaust 4.5 mm (0.18 in)
YM-4113, 90890-04113
YM-4118, 90890-04118
How to use
This tool is necessary for checking
ignition timing.
This tool is needed to remove and
install the valve assemblies.
This tool is used to hold the clutch
when removing or installing the
clutch boss securing nut.
This tool is needed to remove and
install the valve guide.
This tool is needed to install the
valve guide.
This tool is needed to rebore the
new valve guide.
1-6
SPECIAL TOOLS
Illustration