Wiseco PK1447 Top End Piston Kit 89mm 12:1 Compression KTM 450 EXC/MXC/XC-W

The Wiseco PK1447 is a complete top-end piston kit engineered for the KTM 450 EXC, MXC, and XC-W 4-stroke off-road platform. Featuring a standard 89.00mm bore and a high-compression 12.0:1 compression ratio, this kit delivers the performance and reliability demanded by serious off-road and enduro riders.

Key Features:

• 89.00mm standard bore — direct replacement for stock cylinder dimensions
• 12.0:1 compression ratio — optimized for maximum power output in off-road 4-stroke applications
• Forged construction — engineered and forged in-house in Mentor, OH for superior strength-to-weight ratio
• ArmorGlide skirt coating — reduces piston-to-wall friction, improves ring seal, and minimizes piston rock for consistent power delivery
• Dedicated application-specific forging — designed specifically for KTM 450cc 4-stroke engines to ensure optimal fit and performance
• Improved tensile strength — forged aluminum construction outperforms cast pistons in resistance to impact and fatigue under extreme racing conditions
• Complete kit contents — includes forged piston, piston rings, wrist pin, circlips, and top-end gasket set

Unlike cast pistons, Wiseco's forged pistons feature a condensed, aligned grain structure that produces higher mechanical properties and superior resistance to the fatigue and impact stresses of high-performance motorsport use. The kit includes everything needed for a complete top-end rebuild, making it the go-to solution for enduro and off-road racing applications where durability and consistent power are critical.