Wiseco PK1123 Top-End Piston Kit Honda - 67.0mm 10.0 1 XR185 XR200 1986-1991

The Wiseco PK1123 is a complete top-end piston kit engineered specifically for 1986–1991 Honda XR185 and XR200 engines. Featuring a 67.00mm bore and a 10.0:1 compression ratio, this kit uses Wiseco forging number 4156M and delivers the strength, durability, and precision demanded by off-road and trail riding applications.

Key Features:

• 67.00mm forged piston — an oversize bore option for worn or rebuilt engines
• 10.0:1 compression ratio — optimized for strong power delivery on the XR185/XR200 single-cylinder four-stroke
• Aerospace-grade forged aluminum alloy — condensed grain structure aligned to part geometry for superior tensile strength, impact resistance, and fatigue life compared to cast pistons
• Complete kit — includes piston rings, wrist pin, and circlips; everything needed for a full top-end rebuild
• Engineered, forged, and machined in the USA — manufactured at Wiseco's facility in Mentor, OH with full in-house forge tooling and CNC machining
• Optimized strength-to-weight ratio — dedicated forging design maximizes performance without adding unnecessary mass
• In-house dyno testing and R&D ensure each design meets real-world racing and trail performance demands

Wiseco forged pistons outperform cast alternatives because their condensed grain structure resists catastrophic failure under high stress — a critical advantage in demanding four-stroke applications. The PK1123 kit provides a reliable, performance-oriented solution for rebuilding or overboring the Honda XR185 and XR200 engine.