SKU:11-9891
Upgrade the performance and durability of your Harley-Davidson XL engine with the Wiseco K1661 Forged .010 Oversize 9:1 Compression Piston Kit. Designed for select 1988–1997 Harley-Davidson XL models, this kit features a forged piston engineered for dependable operation and consistent performance. The .010-inch oversize specification is intended for properly machined cylinders, while the 9:1 compression ratio supports strong street-oriented power and responsive engine performance.
Proper installation and engine preparation are essential for achieving the best results from this Wiseco piston kit. Verify cylinder condition, piston-to-cylinder clearance, ring end gap, and all related fitment specifications before assembly. After installation, run the engine at moderate speeds for at least 500 miles and avoid excessive operation in lower gears to properly break in the new piston and rings. Refer to the Wiseco Piston Installation Guide and Fitment instructions for application-specific procedures and technical requirements.
The Wiseco K1661 piston kit is supplied as a kit for engine rebuilding and performance applications. A compatible .010 oversize Evolution piston ring set, such as part number 11-9762, may be selected separately when required by the application. Additional installation tools, including a Ring-O-Matic ring compressor tool kit and connecting rod clamping tool, can help support accurate and efficient assembly. Confirm all components and clearances before installation to ensure compatibility with your engine build.
This forged 9:1 compression piston kit fits 1988 through 1997 Harley-Davidson XL applications. It is manufactured in the USA and is intended for builders seeking a reliable replacement or performance-oriented upgrade for a properly prepared engine. Always consult the vehicle service information and Wiseco instructions before installation.
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