Honda SH125 Manual page 236

Remove the sprag clutch from the clutch outer.
INSPECTION
Check the starter driven gear and reduction gear
teeth for wear or damage.
Measure the starter driven gear bushing I.D.
SERVICE LIMIT: 22.10 mm (0.870 in)
Measure the starter driven gear boss O.D.
SERVICE LIMIT: 39.58 mm (1.558 in)
Check the starter clutch outer and sprag clutch for
abnormal wear or damage.
Measure the starter clutch outer I.D.
SERVICE LIMIT: 56.36 mm (2.219 in)
ASSEMBLY
Apply engine oil to the sprag clutch.
Install the sprag clutch into the clutch outer with the
marked side facing to the flywheel side.
Install the clutch outer onto the flywheel with the
marked side facing to the starter driven gear side.
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