Yamaha YFM660RN Service Manual page 77

CHANGING THE ENGINE OIL
4.Remove:
Dipstick 1
Engine oil drain bolt (oil tank) 2
Engine oil drain bolt (crankcase) 3
Drain the engine oil from the oil tank and
crankcase.
5.If the oil filter cartridge is also to be replaced,
perform the following procedure.
***********************************************
Replacement steps:
Remove the oil filter cartridge 1 with an oil
filter wrench 2.
Apply a thin coat of engine oil to the O-ring
3 of the new oil filter cartridge.
CAUTION:
Make sure that the O-ring 3 is properly
seated in the groove of the oil filter car-
tridge.
3 - 21
CHK
ADJ
Oil filter wrench:
P/N. YM-01469, 90890-01469