4881M07700 Wiseco Std Piston Kit for Yamaha YZ250F 2005-2007 77.00mm 13.5:1

Wiseco Std Piston Kit for Yamaha YZ250F

This Wiseco standard piston kit for Yamaha YZ250F fits 2005-2007 models with a 77.00mm bore and a higher 13.5:1 compression ratio, cross-referenced to 4881M07700.

Overview

This Wiseco Std Piston Kit for Yamaha YZ250F is a top-end replacement aimed at riders wanting sharper throttle response from a stock bore. It runs a 77.00mm piston at 13.5:1 compression and carries OEM cross-reference 4881M07700. It suits YZ250F owners rebuilding the engine for race or practice use.

Built For Performance

• 77.00mm standard bore keeps the stock cylinder in service
• 13.5:1 compression ratio for stronger combustion and quicker revs
• Forged piston body built for high-rpm four-stroke stress
• OEM cross-reference 4881M07700 for accurate parts matching
• Complete kit layout covering rings, pin, and clips for assembly

Fits These Machines

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

On-The-Job Use

• Race builds needing higher compression within the stock bore
• Top-end rebuilds after compression loss or piston wear
• Seasonal motocross engine maintenance
• Garage and shop rebuild projects on YZ250F motors

Specs At A Glance

Good To Know

Q: Will a 13.5:1 piston need race fuel? A: Higher compression ratios often call for premium or higher-octane fuel to avoid detonation. Check your fuel quality and jetting before riding.

Q: Is this piston a direct fit in the stock cylinder? A: It is a 77.00mm standard bore piston intended for a stock cylinder in serviceable condition. Verify bore wear and clearance during assembly.

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