Wiseco WK1318 Complete Top-End Piston Kit 81.50mm 0.50mm Oversize for Yamaha 700 2-Stroke Watercraft

The Wiseco WK1318 is a complete top-end rebuild kit designed for Yamaha 700cc 2-stroke personal watercraft engines. This oversize kit features an 81.50mm bore (0.50mm oversize from the standard 81.00mm), increasing displacement to 710cc for enhanced performance and extended engine life after cylinder boring.

Complete Kit Includes:

• Two high-performance forged pistons (790M08150)
• Semi-keystone piston ring sets (3207KD)
• Wrist pins - 20mm x 60mm (S631)
• Round wire circlips - 20mm (CW20)
• Complete top-end gasket kit for 700cc Yamaha watercraft (W5494)

Key Features:

• Forged from high-silicon aluminum alloy for superior strength and reduced weight
• CNC machined Pro-Lite design optimizes cam shape and profile for maximum horsepower
• Low-expansion aluminum provides improved heat transfer and longer service life
• Diamond-turned finish ensures consistent sizing and compatibility with all cylinder bore compositions
• Dual-ring configuration for reliable sealing and performance

Specifications:

• Bore Size: 81.50mm (0.50mm oversize)
• Standard Bore: 81.00mm
• Displacement: 710cc (with oversize pistons)
• Stroke: 68.00mm
• Cylinders: 2
• Piston Pin Diameter: 20mm

Important Notes:

• Oversize pistons require professional cylinder boring to 81.50mm
• Wiseco rings are application-specific and only compatible with Wiseco pistons
• This kit provides all components needed for a complete twin-cylinder top-end rebuild

Wiseco has been the trusted choice for performance engine rebuilds in powersports applications. Each piston is precision-forged in the USA using aerospace-grade materials and advanced manufacturing techniques to deliver reliable, race-proven performance for both recreational riders and competitive racers.