Jet Pump Wear Ring 144mm ID for Yamaha GP 800 1998-2000

Jet Pump Wear Ring for Yamaha GP 800

This 144mm ID jet pump wear ring for Yamaha GP 800 refreshes the impeller-to-housing clearance, helping the pump hold thrust and cut down on cavitation.

Overview

This jet pump wear ring for Yamaha GP 800 is a 144mm inner diameter replacement that installs in the pump housing and sets the running gap around the impeller. Keeping that gap in spec lets the wear ring for Yamaha GP 800 push water through the nozzle rather than letting it recirculate, which protects acceleration and top speed. It is aimed at owners servicing a 1998-2000 GP 800 pump after wear, impeller swap, or debris damage.

Built For Performance

• 144mm inner diameter matches the stock pump bore for correct impeller clearance
• Replaces a grooved or eroded ring that has opened up clearance over time
• Helps limit cavitation and ventilation during hard launches
• Drops into the pump housing location without machining
• Works in both fresh and salt water personal watercraft

Fits These Machines

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

On-The-Job Use

• Pump rebuilds after impeller replacement
• Scheduled driveline service on GP 800 hulls
• Recovering performance after sand, gravel, or debris passes through the pump
• Recreational riding in fresh and salt water

Specs At A Glance

Good To Know

Q: How do I know the wear ring needs replacing? A: A ring with visible grooves, scoring, or a loose impeller gap usually causes cavitation and slower acceleration. Measuring the clearance against spec confirms whether a new ring is needed.

Q: Does this ring fit any 144mm Yamaha pump? A: It is sized for 144mm bore pumps used on the 1998-2000 GP 800, but other models can share similar dimensions with different housings. Verify your pump bore and model year before ordering.

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