Wiseco 4330M09300 Forged Piston Kit Oversize Honda - 93.00mm XR500R 1983-1984

The Wiseco 4330M09300 is a high-performance forged piston kit designed for the Honda XR500R (1983–1984), offering a 93.00mm oversize bore and 10.25:1 compression ratio. Built for riders who demand more from a rebuilt or bored engine, this kit delivers the strength and precision that Wiseco is known for across all forms of powersports competition.

Wiseco forges all of its pistons from high-silicon aluminum alloy, producing a denser grain structure than cast alternatives. This results in improved tensile strength, better resistance to impact and fatigue, and an optimized strength-to-weight ratio — critical for the high-revving demands of the XR500R's single-cylinder 498cc 4-stroke engine.

Key Features:

• Bore Size: 93.00mm (+1mm oversize)
• Compression Ratio: 10.25:1
• Engine Displacement: 498cc | Stroke: 75.00mm
• Forged from high-silicon aluminum alloy for superior strength and durability
• Dedicated forging design optimizes strength-to-weight ratio for each specific application
• 4-stroke race-ready dome finish with smooth edges for improved combustion flow
• Horizontal slot-pin oiling reduces friction and provides scuff resistance
• Pressure seal groove for maximum ring seal integrity
• CNC diamond-turned finish ensures precise sizing with no variation
• Compatible with cast iron, chrome, Nikasil, and boron composite cylinder bore compositions
• Engineered, forged, and machined in the USA

Kit Includes: Forged piston, high-performance piston rings, wrist pin, and circlips — everything needed for a complete top-end rebuild.

Note: This is an oversize piston. Cylinder boring or sleeving to 93.00mm is required prior to installation.