4872M07700 Wiseco Std Piston Kit for Yamaha YZ250F 2001-2004 77.00 mm 12.7:1 CR

Piston Kit for Yamaha YZ250F

This Wiseco standard piston kit for Yamaha YZ250F offers a 77.00 mm bore and 12.7:1 compression ratio for stock-spec top-end rebuilds, cross-referencing OEM part 4872M07700.

Overview

This Wiseco piston kit is a standard-bore top-end replacement for the Yamaha YZ250F. It restores factory compression and sealing on a worn engine. Built for riders and mechanics servicing 2001 to 2004 YZ250F motocross machines.

Built For Performance

• 77.00 mm standard bore for stock cylinder fitment
• 12.7:1 compression ratio matching factory specification
• Forged piston construction for high-rpm durability
• Kit includes piston, rings, pin, and clips for a complete rebuild
• Cross-references OEM part 4872M07700
• Machined to match the YZ250F combustion chamber

Fits These Machines

• for Yamaha YZ250F 2001
• for Yamaha YZ250F 2002
• for Yamaha YZ250F 2003
• for Yamaha YZ250F 2004

On-The-Job Use

• Standard-bore top-end rebuilds
• Motocross race engine refreshes
• Trail and practice bike maintenance
• Restoring factory compression on high-hour engines

Specs At A Glance

Good To Know

Q: Does this kit include everything needed for a top-end rebuild? A: It includes the piston, rings, wrist pin, and clips, but gaskets and bearings are typically sold separately. Q: Can I install this without checking cylinder condition? A: No, the cylinder bore and plating should be measured and inspected before fitting a new piston.

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