Yamaha WR450F(R) Owner's Service Manual page 24

Part number
YM-01442, 90890-01442 Fork seal driver
This tool is used when install the fork oil seal.
YU-3112-C, 90890-03112 Yamaha pocket tester
Use this tool to inspect the coil resistance, output
voltage and amperage.
YU-8036-B Inductive tachometer
90890-03113 Engine tachometer
This tool is needed for observing engine rpm.
YM-33277-A, 90890-03141 Timing light
This tool is necessary for checking ignition timing.
YM-4019, 90890-04019 Valve spring compressor
This tool is needed to remove and install the valve
assemblies.
YM-91042, 90890-04086 Clutch holding tool
This tool is used to hold the clutch when removing or
installing the clutch boss securing nut.
YM-4116, 90890-04116 Valve guide remover
YM-4097, 90890-04097 Intake 4.5 mm (0.18 in)
Exhaust 5.0 mm (0.20 in)
This tool is needed to remove and install the valve
guide.
YM-4117, 90890-04117 Valve guide installer
YM-4098, 90890-04098
This tool is needed to install the valve guide.
YM-4118, 90890-04118 Valve guide reamer
YM-4099, 90890-04099
This tool is needed to rebore the new valve guide.
Tool name/How to use
Intake
Exhaust
Intake 4.5 mm (0.18 in)
Exhaust 5.0 mm (0.20 in)
SPECIAL TOOLS
YM-01442
YU-3112-C
YU-8036-B
YM-33277-A
YM-4019
YM-91042
YM-4116
YM-4097
YM-4117
YM-4098
YM-4118
YM-4099
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GEN
INFO
Illustration
90890-01442
90890-03112
90890-03113
90890-03141
90890-04019
90890-04086
90890-04116
90890-04097
90890-04117
90890-04098
90890-04118
90890-04099