2004-2005 660 Yamaha Rhino Factory Service Manual, Page 152Get this manual
CAMSHAFT AND CYLINDER HEAD
cTemporarily install the camshaft sprocket on the camshaft(Do not install the bolts Then, install the timing chain on the camshaft sprocketNOTE: Make sure the small holes on the camshaft face upwarddAlign the notches on the decompressor cams with the projections on the decompressor spring lever, then install the camshaft sprocket on the camshaftNOTE: Check that each part is positioned as shown in the illustration6 Small holes on camshaft sprocket Punch mark on decompressor spring lever Top front of cylinder head
eInstall the decompressor cam guide plates and camshaft sprocket bolts 0Camshaft sprocket bolt 20 Nm (2.0 kg, 14 ft lb)