4689M07350 Wiseco .020 Piston Kit 73.50 mm 10.5:1 for Yamaha TTR250 1999-2006

Wiseco .020 Piston Kit for Yamaha TTR250

This Wiseco piston kit for Yamaha TTR250 brings a .020 inch overbore, 73.50 mm bore size, and 10.5:1 compression ratio, and it is a direct cross-reference to OEM part 4689M07350.

Overview

This Wiseco piston kit for Yamaha TTR250 is a forged piston assembly made for top-end rebuilds on 1999 through 2006 models. The .020 overbore of 73.50 mm restores cylinder sealing and compression for riders who need a reliable replacement after wear or a bore job. It is intended for home mechanics and shops rebuilding Yamaha TTR250 engines.

Built For Performance

• .020 inch overbore at 73.50 mm for a fresh cylinder fit
• 10.5:1 compression ratio suited to the TTR250 engine
• Forged piston construction from Wiseco
• Kit format includes piston for top-end rebuild
• Cross-references OEM part 4689M07350

Fits These Machines

• for Yamaha TTR250 1999
• for Yamaha TTR250 2000
• for Yamaha TTR250 2001
• for Yamaha TTR250 2002
• for Yamaha TTR250 2003
• for Yamaha TTR250 2004
• for Yamaha TTR250 2005
• for Yamaha TTR250 2006

On-The-Job Use

• Top-end rebuilds on worn TTR250 engines
• Cylinder rebore jobs needing a .020 oversize piston
• Restoring compression after piston or ring wear
• Trail and off-road maintenance schedules

Specs At A Glance

Good To Know

Q: Does this piston require a matching bore size? A: Yes, sizing to 73.50 mm overbore means the cylinder should be bored to match the .020 oversize piston before assembly.

Q: Is this a complete top-end kit? A: This listing covers the Wiseco piston kit as described, so check your engine needs for rings, pin, and clips 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.