Wiseco 4045M08900 Forged Piston Kit Bore Compression Yamaha - 89mm 10 1 XT/TT/SR500

The Wiseco 4045M08900 is a high-performance forged piston kit designed for the Yamaha XT500, TT500, and SR500. Featuring an 89.00mm bore diameter and a 10:1 compression ratio, this oversize piston kit is engineered to restore or upgrade engine performance with improved strength and precision fit.

Key Features:

• Forged High-Silicon Aluminum Construction — Wiseco pistons are forged from high-silicon, low-expansion aluminum alloy for superior strength, reduced weight, improved heat transfer, and extended service life compared to cast alternatives.
• Precision Diamond-Turned Finish — CNC-machined on computer-controlled turning centers to guarantee a perfect finish with zero size variation, ensuring consistent, reliable fitment.
• Compatible with Multiple Cylinder Bore Types — Designed for use with cast iron, chrome, Nikasil, and boron composite cylinder bore compositions.
• Engineered, Forged, and Machined in the USA — Manufactured at Wiseco's facility in Mentor, OH, with dedicated forgings that optimize the strength-to-weight ratio for each specific engine application.
• Oversize Design — This 89.00mm oversize piston is ideal for rebuilding worn cylinders; note that cylinder boring is required prior to installation.
• Complete Kit — Includes the forged piston, high-quality piston rings, wrist pin, and circlips.

Built to handle the demands of both competitive racing and recreational riding, the Wiseco 4045M08900 delivers the performance and reliability that the Yamaha XT/TT/SR500 platform deserves. Cylinder boring is required for proper installation of this oversize piston.