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SPECIAL TOOLS
GEN
INFO
Tool No. Tool name/Function Illustration
90890-04044
YM-04044
Piston ring compressor
This tool is used to compress piston rings
when installing the cylinder.
90890-03158
Carburetor angle driver
This tool is used to turn the pilot screw when
adjusting the engine idling speed.
Valve spring
compressor
90890-04019
YM-04019
Attachment
90890-04108
YM-01253
Valve spring compressor
Attachment
These tools are used to remove or install the
valve assemblies.
Middle driven shaft
bearing driver
90890-04058
YM-4058
Mechanical seal
installer
90890-04078
YM-33221
Middle driven shaft bearing driver
Mechanical seal installer
These tools are used to install the water pump
seal.
90890-04086
YM-91042
Clutch holding tool
This tool is used to hold the clutch boss
when removing or installing the clutch boss
nut.
90890-04101
Valve lapper
This tool is needed to remove and install
the valve lifter.
90890-04111
Valve guide remover (φ4)
This tool is used to remove or install the valve
guides.
90890-04112
Valve guide installer (φ4)
This tool is used to install the valve guides.
90890-04113
YM-04113
Valve guide reamer (φ4)
This tool is used to rebore the new valve
guides.
90890-06754
YM-34487
Ignition checker
This tool is used to check the ignition system
components.