Jet Pump Wear Ring 144mm ID for Yamaha SuperJet 650 1990-1993

Jet Pump Wear Ring for Yamaha SuperJet 650

This 144mm ID jet pump wear ring for Yamaha SuperJet 650 restores proper clearance between the impeller and pump housing, helping maintain thrust and reduce cavitation.

Overview

This jet pump wear ring for Yamaha SuperJet 650 is a 144mm inner diameter replacement component that seats in the pump housing and controls the gap around the impeller. By holding that clearance tight, the wear ring for Yamaha SuperJet 650 helps the pump move water efficiently instead of recirculating it, which keeps hole shot and top-end speed consistent. It suits riders rebuilding a 1990-1993 SuperJet pump during routine service or after impeller damage.

Built For Performance

• 144mm inner diameter sizing matches the stock pump bore for consistent impeller clearance
• Restores lost thrust caused by a worn, grooved, or eroded original ring
• Helps reduce cavitation and ventilation under hard acceleration
• Direct-fit replacement for the pump housing location, no machining required
• Suits fresh and salt water personal watercraft use

Fits These Machines

• for Yamaha SuperJet 650, 1990
• for Yamaha SuperJet 650, 1991
• for Yamaha SuperJet 650, 1992
• for Yamaha SuperJet 650, 1993

On-The-Job Use

• Pump rebuilds after impeller replacement or debris damage
• Routine driveline service on older SuperJet 650 hulls
• Restoring a machine used for freestyle and closed course riding
• Freshwater and saltwater recreational riding

Specs At A Glance

Good To Know

Q: Why does impeller clearance matter on this wear ring? A: Excessive clearance lets water slip past the impeller instead of being pushed out the nozzle, which shows up as slower acceleration and cavitation. Replacing the ring restores the tight running gap the pump was designed around.

Q: How do I confirm this ring fits my ski? A: Check that your pump uses a 144mm bore wear ring and that your machine falls in the 1990-1993 SuperJet 650 range. Measuring the old ring before ordering avoids a mismatch on serial-number variants.

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