Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 160Get this manual

ROCKER ARM AND VALVES
Push rod guide inspection 1Inspect: 9Push rod guide CracksWearDamage Replace
Valve guide replacement Replacement steps:

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