4882M07700 Wiseco Std Piston Kit for Yamaha YZ250F 2005-2007 77.00mm 12.5:1

Wiseco Std Piston Kit for Yamaha YZ250F

This Wiseco standard piston kit for Yamaha YZ250F restores top-end compression on 2005-2007 models, using the 77.00mm bore and 12.5:1 compression ratio matched to OEM cross-reference 4882M07700.

Overview

This Wiseco Std Piston Kit for Yamaha YZ250F is a direct-fit top-end replacement built to bring worn four-stroke engines back to spec. The kit delivers a 77.00mm standard bore piston with a 12.5:1 compression ratio, cross-referenced to 4882M07700. It suits riders and mechanics rebuilding a YZ250F for trail, track, or practice use.

Built For Performance

• 77.00mm standard bore size matches the factory cylinder without overboring
• 12.5:1 compression ratio for strong mid-range and top-end pull
• Forged piston construction for strength under high-rpm four-stroke loads
• OEM cross-reference 4882M07700 for straightforward parts matching
• Kit format includes piston, rings, pin, and clips for a complete top-end refresh

Fits These Machines

• for Yamaha YZ250F 2005
• for Yamaha YZ250F 2006
• for Yamaha YZ250F 2007

On-The-Job Use

• Top-end rebuilds after piston wear or loss of compression
• Routine race-season maintenance on motocross bikes
• Trail and off-road riding where reliable compression matters
• Shop and home garage engine refresh projects

Specs At A Glance

Good To Know

Q: Is this a standard bore piston or an overbore? A: It is a 77.00mm standard bore piston, so it works with a stock cylinder in good condition. Measure your bore and piston clearance before assembly.

Q: Does the kit include rings and a pin? A: Piston kits of this type normally ship as a complete top-end set with rings, wrist pin, and clips. Confirm the contents listed by the seller before ordering.

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