Yamaha 68F-11636-00-00 – Piston (0.50mm o/s)

Yamaha 68F-11636-00-00 – Piston (0.50mm o/s)

Oversized OEM Replacement Piston for Yamaha Outboards

The Yamaha 68F-11636-00-00 – Piston (0.50mm o/s) is a genuine oversized replacement piston, engineered for Yamaha outboard motors that require a 0.50mm overbore. Built to Yamaha’s exact factory specifications, this piston restores compression and efficiency after cylinder reboring due to scoring or wear—ensuring optimal performance and longevity.

Key Features

0.50mm Oversized Fitment

Designed specifically for engines with re-machined cylinder bores needing 0.50mm oversize.

Genuine Yamaha Quality

Manufactured to OEM standards for precise fit, strength, and durability.

Restores Compression and Power

Maintains optimal combustion efficiency for smooth, reliable engine operation.

Heat-Resistant Construction

Forged for high heat and load resistance—ideal for marine performance environments.

Ideal Use Cases

Repairing engines with cylinder scoring or wear

Rebuilding older Yamaha outboards to factory compression specs

Enhancing engine performance after cylinder reboring

Why Oversized Pistons Matter

When your outboard’s cylinder has been machined to correct wear or scoring, using a standard piston won’t seal properly. The Yamaha 68F-11636-00-00 – Piston (0.50mm o/s) is precision-sized for 0.50mm oversize bores, providing the tight fit necessary to restore compression and prevent blow-by. Choosing a genuine Yamaha part means you’re getting a piston engineered to meet the same durability and performance standards as your original.

Frequently Asked Questions

How do I know if I need a 0.50mm oversized piston?

Oversized pistons are used after the cylinder has been bored out due to wear or damage. Your marine technician or service manual can confirm the required size.

Can I replace just one piston or should I do a full set?

While you can replace a single piston, it's often best to inspect all cylinders and replace pistons as a matched set for consistent performance.

This product has been superseded by: 68F-11636-01-00

Yamaha 68F-11636-01-00 - Piston (0.50mm o/s)