Suzuki GW250 Service Manual page 319

SPROCKET
Inspect the sprocket teeth for wear. If they are worn as shown,
replace the two sprockets and drive chain as a set.
BEARING
Inspect the play wheel bearing and sprocket mounting drum
bearing by hand while they are installed in place. Rotate the
inner race by hand to inspect for abnormal noise and smooth
rotation. Replace the bearing if there is anything unusual.
• Remove the sprocket mounting drum bearing 1 and wheel
bearings 2 using the special tool.
 09921-20240: Bearing remover set
• Remove the spacer 3.
A Normal wear
B Excessive wear
CHASSIS 8-35