66E-11311-00-94 Engine Cylinder for Yamaha GP 800 1998-2002

Engine Cylinder for Yamaha

This replacement engine cylinder is a direct-fit part for Yamaha GP 800 watercraft, cross-referencing OEM number 66E-11311-00-94 for straightforward identification.

Overview

The engine cylinder for Yamaha GP 800 sits at the heart of the top end, housing the piston and managing combustion gases and heat. This replacement engine cylinder restores proper bore geometry and sealing for rebuilds and top-end refreshes. It suits riders and shops working on 1998 to 2002 GP 800 machines who need a dependable cylinder for Yamaha powerplants.

Built For Performance

• Cast to match the original bore and port layout for the 66E engine family
• Machined deck surface for a clean head gasket seal
• Cooling passages formed to original spec for consistent temperature control
• Cross-references OEM number 66E-11311-00-94 for easy verification
• Direct-fit replacement for stock cylinder without adapter parts

Fits These Machines

• for Yamaha GP 800, 1998
• for Yamaha GP 800, 1999
• for Yamaha GP 800, 2000
• for Yamaha GP 800, 2001
• for Yamaha GP 800, 2002

On-The-Job Use

• Top-end rebuilds after piston scoring or seizure
• Bore damage repair from overheating or lean run conditions
• Restoring compression on high-hour GP 800 engines
• Shop rebuilds where a fresh cylinder saves downtime

Specs At A Glance

Good To Know

Q: Does this cylinder need new pistons and rings? A: A fresh cylinder should be paired with new pistons, rings and a head gasket matched to its bore. Reusing worn pistons can cause poor sealing and repeat failure.

Q: How do I confirm this fits my watercraft? A: Cross-reference the OEM number 66E-11311-00-94 against your existing cylinder and confirm your model year falls between 1998 and 2002. Checking serial number details before ordering avoids mismatches.

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