Honda 954 Service Manual page 297

Remove the shift fork shaft and shift forks.
Remove the shift d r u m bearing
SHIFT DRUM/SHIFT FORK INSPECTION
Check the shift fork and fork shaft for wear or damage.
Measure the I.D. of the shift fork.
SERVICE LIMIT: 12.03 mm (0.474 in)
Measure the shift fork claw thickness.
SERVICE LIMIT: 5.9 mm (0.23 in)
Measure the O.D. of the shift fork shaft.
SERVICE LIMIT: 11.95 mm (0.470 in)
Inspect the shift d r u m grooves for wear or damage.
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and shift drum.
SHIFT FORK SHAFT
DRUM