1997 Yamaha YFM600FWAK ATV Service Manual, Page 126Get 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
Make sure the small holes on the camshaft 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 holes on camshaft sprocket (]) Punch mark on decompressor sping lever Top front of cylinder head