ROCKER ARM YAMAHA 67D-12151-00

Function and technical context

The rocker arm is an essential component of the variable timing system in Yamaha four-stroke engines, responsible for transmitting the rotary movement of the camshaft to the intake and exhaust valves. It works as a pivoting lever that converts the rotation of the command into linear movement, allowing the synchronized opening and closing of the valves in each engine cycle. Its correct operation guarantees precision in distribution times; A worn or deteriorated rocker arm causes imbalances in valve timing, resulting in loss of compression, reduced engine performance, increased fuel consumption and possible secondary damage to valves and cam controls.

When to replace this part?

Inspect the rocker arm periodically during seasonal maintenance services, especially if you notice clunking noises coming from the cylinder head, difficulty starting, or erratic engine operation. Wear in the contact areas with the camshaft and valve stems is progressive; Checking the valve clearance annually makes it easier to detect deterioration early. Preventatively replacing the rocker before it reaches critical wear prevents costly and lengthy repairs, avoiding cascading damage that would compromise the reliability of the boat.

Equivalent manufacturer part numbers