The proper special tools are necessary for complete and accurate tune-up and assembly. Using the correct special tool will
help prevent damage caused by the use of improper tools or improvised techniques. The shape and part number used for
the special tool differ by country, so two types are provided. Refer to the list provided to avoid errors when placing an order.
• For U.S.A. and Canada, use part number starting with "YM-", "YU-" or "ACC-".
• For others, use part number starting with "90890-".
Tool name/Part number
Crankcase separating tool
Rotor holding tool
Dial gauge and stand
Crankshaft installing tool
Crankshaft installing pot
Crankshaft installing bolt
Spacer (crankshaft installer)
Piston pin puller set
How to use
These tool is used to remove the
crankshaft from either case.
This tool is used to remove the fly-
This tool is used when loosening or
tightening the flywheel magneto se-
These tools are used to check each
part for runout or bent.
These tools are used to install the
This tool is used to remove the pis-