Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 84Get this manual

INSP ADJ
GENERAL
9Spark plug

(with spark plug cleaner or wire brush) Spark plug type (NGK): B6HSBR6HS

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives