790M08400 .120 Piston 84mm +3mm for Yamaha Wave Blaster 700 1993-1996

Wiseco .120 Piston for Yamaha Wave Blaster 700

This Wiseco .120 oversize piston for Yamaha Wave Blaster 700 watercraft measures 84 mm and is built for bored cylinders, cross-referencing part 790M08400.

Overview

This Wiseco .120 oversize piston for Yamaha Wave Blaster 700 is a replacement piston intended for engines that have been bored 3 mm over the original 81 mm size. It restores piston-to-wall clearance after cylinder wear or damage and is aimed at riders rebuilding the top end of a 700 cc two-stroke powerplant. The 84 mm size makes this piston a fit for machined cylinders rather than a stock bore.

Built For Performance

• 84 mm oversize bore, 3 mm larger than the original 81 mm dimension
• Forged aluminum body for strength under high combustion temperatures
• Machined ring grooves matched to the specified ring set
• Controlled skirt profile for consistent clearance in a bored cylinder
• Sold as a single piston for one cylinder

Fits These Machines

• for Yamaha Wave Blaster 700, 1993-1996

On-The-Job Use

• Top end rebuilds on cylinders bored to the next oversize
• Recreational riding and freestyle personal watercraft sessions
• Freshwater and saltwater use
• Repair after cylinder scoring or seizure damage

Specs At A Glance

Good To Know

Q: Will this oversize piston drop into a stock cylinder? A: No, an 84 mm piston requires the cylinder to be bored and honed to match the oversize dimension with the correct clearances. Installing it into an unmodified stock bore will not work.

Q: Is a matching ring set included? A: Confirm the listing contents, since rings, wrist pin, and clips are often sold separately from the piston. Having the correct rings on hand before assembly avoids delays.

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