Wiseco PK1120 Forged Piston Kit Honda Compression - 65.5mm 1986-1991 XR185/XR200 10.0 1

The Wiseco PK1120 is a 65.50mm forged piston kit designed for 1986–1991 Honda XR185 and XR200 dirt bikes. Featuring a 10.0:1 compression ratio and manufactured to Wiseco's exacting standards, this kit includes the top-end gasket set needed for a complete engine refresh.

Wiseco forges all of its pistons in-house at their USA facility, controlling every step of the manufacturing process — from raw bar stock through final skirt coating. This vertical integration ensures consistent quality and allows Wiseco's engineers to develop cutting-edge piston technology including advanced shapes, performance coatings, and optimized components.

Why Forged Over Cast?

• Forged pistons feature condensed, aligned grain structure that produces superior mechanical properties
• Greater resistance to impact and fatigue compared to brittle cast pistons
• Cast pistons tend to fail catastrophically when yield strength is exceeded — forgings do not
• Optimized strength-to-weight ratio maximizes power output and durability

Kit Specifications:

• Bore Size: 65.50mm (4156M)
• Compression Ratio: 10.0:1
• Application: 1986–1991 Honda XR185, XR200
• Includes: Forged piston and top-end gasket kit
• Manufactured: USA

Wiseco's in-house dyno testing and rigorous R&D program ensure each piston kit delivers race-proven performance for off-road and trail riding applications. Whether used for a routine rebuild or a performance upgrade, the PK1120 provides the reliability and strength that Honda XR riders demand.