1998-2001 Yamaha YFM600FHM Grizzly Factory Service Manual, Page 157Get this manual
CAMSHAFT AND CYLINDER HEAD
.Temporarily install the camshaft sprocket on the camshaft(Do not install the bolts Then, install the timing chain on the camshaft sprocket
NOTE: Make sure the small holes on the cam-
shaft face upward
Align the notches on the decompressor cams with the projections on the decompressor spring lever, then install the camshaft sprocket on the camshaft
Check that each part is positioned as shown in the illustration Small