Wiseco CK160 Top End Piston Kit 66.50mm 13.5:1 Domed 4-Stroke 2618XA Forged

The Wiseco CK160 is a complete top end piston kit engineered for the Yamaha YZF-R6 inline four-cylinder engine. Featuring a 66.50mm bore (1.00mm oversize) and a high-compression 13.5:1 domed piston, this kit is purpose-built for race and high-performance street applications where maximum power and reliability are required. The piston is forged from 2618XA aerospace-grade aluminum alloy, a material prized for its superior strength-to-weight ratio and resilience under high heat and stress conditions.

Kit Contents:

• Forged 2618XA aluminum piston(s) — 66.50mm bore, 13.5:1 compression ratio
• High-performance ring set (2618XA 66.50mm ring set)
• 16mm alloy wrist pin (S554 — 16mm x 1.752 in.)
• Round wire pin locks / circlips (16mm pair)
• Top end cylinder head gasket set

Key Features:

• Race-ready domed crown with smooth edges promotes improved combustion flow and resistance to detonation
• ArmorGlide skirt coating — Wiseco's proprietary low-friction polymer coating reduces piston rock, minimizes noise, and allows tighter bore fitment for improved ring seal and increased horsepower
• Dedicated forging designed specifically for this engine application, optimizing strength, weight, and dimensional accuracy
• 4-valve head design compatible — engineered to work with the YZF-R6's 4-valve-per-cylinder configuration
• Forged and machined in the USA at Wiseco's Mentor, Ohio facility

Specifications:

• Bore — Standard: 65.50mm
• Bore — Actual (Oversize): 66.50mm (+1.00mm)
• Compression Ratio: 13.5:1
• Stroke: 44.50mm
• Displacement: 618cc
• Piston Crown: Domed
• Alloy: 2618XA Forged Aluminum
• Wrist Pin: S554 — 16mm x 1.752 in.

Important Installation Notes: Cylinder boring and replating are required prior to installation. This kit is intended for performance or race rebuilds and requires proper machine shop preparation for correct fitment.