790M08100 Wiseco Std Piston for Yamaha Wave Runner XL700 81mm
790M08100 Wiseco Std Piston for Yamaha Wave Runner XL700 81mm
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Wiseco Std Piston for Yamaha Wave Runner XL700
This Wiseco standard bore piston, part 790M08100 at 81 mm, is a direct-fit replacement piston for the 1999-2004 Yamaha Wave Runner XL700, restoring compression and reliable engine performance.
Overview
The Wiseco Std Piston for Yamaha Wave Runner XL700 is a forged replacement piston engineered for the 700 cc two-stroke engine used in these personal watercraft. It restores factory bore dimensions and dependable combustion for riders doing top-end rebuilds. This piston suits DIY mechanics and shops servicing 1999-2004 XL700 models.
Built For Performance
- Forged aluminum construction for high strength under combustion loads
- Standard 81 mm bore size matches the original cylinder dimension
- Designed for two-stroke watercraft engine rebuilds
- Precision machined for consistent ring sealing and compression
- Direct replacement for OEM piston in the XL700 engine family
Fits These Machines
- for Yamaha Wave Runner XL700 1999
- for Yamaha Wave Runner XL700 2000
- for Yamaha Wave Runner XL700 2001
- for Yamaha Wave Runner XL700 2002
- for Yamaha Wave Runner XL700 2003
- for Yamaha Wave Runner XL700 2004
On-The-Job Use
- Top-end rebuilds on 700 cc Yamaha two-stroke watercraft engines
- Restoring compression after piston scoring or ring wear
- Seasonal maintenance for personal watercraft kept in salt or fresh water
- Shop rebuilds where factory bore size must be retained
Specs At A Glance
| Part Number(s) | 790M08100 |
| Bore Size | 81 mm standard |
| Type | Forged piston |
| Application | Two-stroke watercraft engine |
Good To Know
Q: Does this piston fit any 700 cc Yamaha watercraft? A: It is built for the XL700 platform from 1999-2004, so confirm your model and year before ordering. Q: Do I need to check cylinder condition first? A: Yes, a standard bore piston requires the cylinder to be within factory spec or the piston may not seal correctly. Inspect and measure before installation.
Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.
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