Wiseco Piston Kit 88.00mm Oversize Yamaha YZ490 1984-1990 546M08800

If you're running a YZ490 and want to unlock real gains in compression ratio and top-end power, a quality oversize piston is non-negotiable. The Wiseco +1.00mm kit gives you the forged strength to handle aggressive tuning and racing demands while maintaining the reliability you need for consistent performance. This is the kind of precision component that separates a well-built engine from a compromised one.

The 546M08800 arrives as a complete kit—piston, rings, wrist pins, and circlips—so you have everything needed for a proper rebuild. Wiseco's high-silicon aluminum construction and forged methodology mean you're getting a component designed to withstand the pressures of both trail and race applications without sacrificing longevity.

• 88.00mm oversize bore
• Forged high-silicon aluminum
• E-Coated finish
• Includes rings, pins, circlips
• Increased compression ratio
• Fits Yamaha YZ490 1984–1990
• Bolt-on installation
• Professional-grade construction