4967M06900 Wiseco .020 Piston Kit for Yamaha YZF-R6 R6S 2006-2025 69mm 13.4:1

Wiseco .020 Piston Kit for Yamaha YFF-R6 & R6S

This Wiseco .020 over piston kit (OEM cross-reference 4967M06900) is a 69 mm, 13.4:1 compression piston assembly for Yamaha YFF-R6 and R6S engines, built to restore top-end power after a rebuild or overbore.

Overview

This Wiseco .020 piston kit is a forged piston assembly designed for Yamaha YFF-R6 and R6S sportbike engines. The 69 mm bore and 13.4:1 compression ratio make this piston kit a direct-fit solution for top-end rebuilds where a slight overbore is required. It suits riders and mechanics rebuilding or refreshing a high-revving Yamaha inline-four.

Built For Performance

• Forged piston construction for strength under high-rpm loads
• .020 inch oversize bore at 69 mm for use after cylinder machining
• 13.4:1 compression ratio for strong combustion pressure
• OEM cross-reference 4967M06900 for easy parts matching
• Designed for Yamaha YFF-R6 and R6S four-cylinder engines
• Ideal for top-end rebuilds and performance refreshes

Fits These Machines

• for Yamaha YFF-R6, 2006-2025
• for Yamaha R6S, 2006-2025

On-The-Job Use

• Top-end rebuilds after cylinder wear or scoring
• Overbore jobs requiring a .020 inch oversize piston
• Sportbike engine refreshes for track or street use
• Shop work where OEM cross-reference 4967M06900 is specified

Specs At A Glance

Good To Know

Q: Is this piston kit a direct replacement? A: It is an oversize .020 kit, so the cylinder must be bored or honed to the matching 69 mm size before installation. Always check your engine's current bore before ordering.

Q: Does the kit include rings and pin? A: Wiseco piston kits of this type typically ship as a complete assembly. Confirm the exact contents with the listing before purchase.

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