Yamaha JT1 Series Service Manual page 40

ENGINE·
Drive Sprocket
2) Hold the drive sprocket with the flywheel magneto
holding tool. and remove the sprocket nut. If
the
flywheel magneto holding tool is not available. shift
the transmission to low gear, and fit a monkey
wrench on the sprocket nut. Then tap the handle
of the wrench with a hammer and the shock will
loosen the nut The best method of removal is an
air impact wrench. (21 mm)
3) Remove the distance collar with pliers. (When re-
installing the distance collar. apply grease to the
oil seal lip groove.)
B. Inspection
Fig. 3-14-2
Fia. 3-14-3
A worn drive spr9cket will result in excessive chain noise and shorten the life of the chain. Check the sprocket for
worn teeth, and replace
1f
they are worn to the extent shown.
Wear
area
Fig. 3-14-4
worn Good
Bent teeth
- 3 4 -