Wiseco 9400XX XX-Series Piston Ring Set Bore - 94mm 4-Stroke

The Wiseco 9400XX is a high-performance XX-Series replacement piston ring set designed for 4-stroke engines with a 94mm bore. Part of Wiseco's most popular ring lineup, the XX-Series delivers race-proven sealing and durability for powersports, automotive, and marine applications. Each set covers one cylinder and is sold individually — order the quantity matching your engine's cylinder count.

Ring Set Specifications:

• Top Ring: 1.0mm width, stainless steel, gas-nitrided, barrel-faced profile for superior sealing and wear resistance
• Second Ring: 1.2mm width, cast iron, phosphate-coated, taper-faced under-hook (Napier) style for enhanced oil scraping
• Oil Ring: 2.8mm, 3-piece assembly with gas-nitrided rails and a stainless steel flex-vent spacer for optimized oil control

Bore Compatibility:

• Designed exclusively for use with Wiseco pistons
• Compatible with cast iron, Nikasil (nickel ceramic plating), boron composite, and Electrofusion cylinder bores
• Not compatible with chrome-plated bores — use in chrome bores will cause engine damage

The Wiseco XX-Series ring design is the standard fitment across a wide range of Wiseco Sport Compact and late-model EFI piston kits, offering a proven balance of compression retention, oil control, and reduced bore friction. Each set is manufactured to Wiseco's exact tolerances for a precise fit with their forged pistons.

Sold as a single-cylinder set. Order one per cylinder.