Yamaha F100B F100C Outboards Factory Service Manual, Page 132Get this manual
Power unit
Oil filter: 18 Nm (1.8 kgfm, 13 ftlb)
Removing and installing the oil filter
1Place rag under the oil filter, and then remove the filterT
Disassembling the cylinder body
1Remove the exhaust cover bolts in the sequence shownS60C5770
Oil filter wrench: 90890-01426