99999-04523-00 Jet Pump Housing for Yamaha GP-R 1800 2019

Jet Pump Housing for Yamaha

This jet pump housing is a replacement component that channels water through the pump assembly on Yamaha 1800 series personal watercraft, cross-referenced to OEM part 99999-04523-00.

Overview

This jet pump housing forms the outer structure that guides water through the impeller on Yamaha 1800 jet drive systems. As a direct-fit replacement, it helps restore thrust and cooling flow when the original housing is damaged or worn. It is intended for riders and technicians servicing the 2019 Yamaha GP-R 1800.

Built For Performance

• Precision-formed to match the OEM 99999-04523-00 mounting footprint
• Rugged cast construction built to handle continuous water exposure
• Internal passage geometry shaped to support consistent impeller flow
• Corrosion-resistant surface treatment for marine environments
• Sealing surfaces machined for a tight fit against pump components

Fits These Machines

• for Yamaha GP-R 1800, 2019
• for Yamaha 1800 series, 2019

On-The-Job Use

• Replacing a cracked or corroded pump housing during driveline service
• Rebuilding the jet pump assembly after impeller or wear ring damage
• Restoring water flow and thrust on a watercraft with a compromised housing
• Routine maintenance on GP-R 1800 jet drive systems

Specs At A Glance

Good To Know

Q: Is this an original Yamaha part? A: No, this is an aftermarket replacement cross-referenced to OEM part 99999-04523-00 for fitment purposes. Always confirm part number and model compatibility before ordering.

Q: What else should be inspected when replacing the housing? A: Check the impeller, wear ring, and seals for wear while the pump is apart. Replacing worn components at the same time helps avoid a second teardown.

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