790M08100 Std Piston 81mm for Yamaha Wave Runner III GP 700 1994-1997

Wiseco Std Piston for Yamaha Wave Runner III GP 700

This standard bore piston for Yamaha Wave Runner III GP 700 watercraft is a 81 mm replacement piston built to restore top end compression, and it cross-references part 790M08100.

Overview

This Wiseco standard piston for Yamaha Wave Runner III GP 700 is a direct-fit engine component for the 700 cc two-stroke powerplant found in these personal watercraft. It gives a worn top end a fresh sealing surface against the cylinder wall so combustion pressure and crankcase vacuum stay where they belong. Riders overhauling the top end on their Wave Runner III GP 700 will find this piston suited to routine rebuild work.

Built For Performance

• 81 mm standard bore size matches the original cylinder diameter
• Forged aluminum construction for high heat and load resistance
• Machined ring grooves sized for the specified piston ring set
• Precision skirt profile helps maintain stable piston-to-wall clearance
• Sold as a single piston for one cylinder

Fits These Machines

• for Yamaha Wave Runner III GP 700, 1994-1997

On-The-Job Use

• Top end rebuilds after compression loss
• Freshwater and saltwater personal watercraft use
• Recreational riding and weekend lake sessions
• Cylinder honing and reconditioning projects

Specs At A Glance

Good To Know

Q: Does this piston come with rings and a wrist pin? A: Check the listing contents carefully, as many Wiseco pistons are sold as the piston body only and rings, pin, and clips may be listed separately. Confirm what is included before ordering so you have every part needed for the rebuild.

Q: Can I install this piston without machine work? A: A standard bore piston still requires the cylinder to be measured, checked for taper and out-of-round, and honed to the correct crosshatch before assembly. Skipping that step risks poor ring sealing and short service life.

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