The wood block slides along the tube. Set it at the oil level for your
model year. Pre-94 level is 355 mm (13.97 in.) with the springs
removed and forks fully EXTENDED. Post-93 level is 171 mm
(6.73 in.) with the springs removed and forks fully COMPRESSED.
NOTE: The method of measurement has changed in the manual for
the 94-02 model years. It is now taken with the forks compressed.
The measurement went from around 14 inches to about 6 3/4
inches, since now the forks are compressed instead of extended.