6JC-11181-00-00 Head Gasket for Yamaha GP 1800 2017-2018

Head Gasket for Yamaha GP 1800

This head gasket for Yamaha seals the gap between the cylinder head and the engine block on 2017-2018 GP 1800 models, and it cross-references OEM part number 6JC-11181-00-00.

Overview

This head gasket for Yamaha is a sealing component that sits between the cylinder head and the engine block on the GP 1800 personal watercraft. The head gasket for Yamaha maintains compression and keeps coolant and oil from mixing inside the engine. It suits riders replacing a blown or worn gasket during a top-end rebuild.

Built For Performance

• Direct cross-reference to OEM part number 6JC-11181-00-00
• Seals the cylinder head-to-block joint under high combustion pressure
• Helps maintain proper compression across the engine
• Prevents coolant and oil from cross-contaminating
• Built to withstand the heat cycles of a marine engine

Fits These Machines

• for Yamaha GP 1800, 2017
• for Yamaha GP 1800, 2018

On-The-Job Use

• Top-end engine rebuilds on GP 1800 personal watercraft
• Replacing a leaking or failed head gasket
• Restoring compression after overheating damage
• Routine engine maintenance on older machines

Specs At A Glance

Good To Know

Q: How do I know if my head gasket needs replacing? A: Common signs include coolant loss, white exhaust smoke, overheating, or milky oil. A compression or leak-down test can confirm the failure before you tear down the top end.

Q: Should I torque the head bolts in a specific sequence? A: Yes, head bolts must be tightened in the pattern and torque values specified in your service manual. Following the proper sequence helps the gasket seat evenly and prevents future leaks.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.