549M07650 Wiseco .020 Piston Kit for Kawasaki JS300 300SX 1986-1991 76.50 mm

Wiseco .020 Piston Kit for Kawasaki JS300/300SX

This Wiseco .020 piston kit for Kawasaki JS300 and 300SX personal watercraft restores top-end performance with a 76.50 mm bore, cross-referencing OEM part 549M07650.

Overview

This Wiseco .020 piston kit is built for the Kawasaki JS300 and 300SX, offering a 76.50 mm overbore option for freshening up worn cylinders. The forged piston is engineered for dependable compression and heat resistance in two-stroke marine environments. Riders and mechanics servicing a 1986-1991 JS300 or 300SX will find this piston kit a solid choice for top-end repair.

Built For Performance

• Forged piston construction for strength under two-stroke combustion loads
• 76.50 mm bore size matched to .020 overbore specifications
• Helps restore lost compression in worn cylinders
• Cross-references OEM part number 549M07650
• Precision machined for consistent ring seal and heat transfer

Fits These Machines

• for Kawasaki JS300
• for Kawasaki 300SX

On-The-Job Use

• Top-end rebuilds on 1986-1991 Kawasaki JS300 and 300SX watercraft
• Restoring compression after cylinder wear or scoring
• Light overbore rebuilds requiring a .020 oversized piston
• Marine engine service and repair shops

Specs At A Glance

Good To Know

Q: Does this piston kit fit both the JS300 and 300SX? A: Yes, it is listed for the 1986-1991 Kawasaki JS300 and 300SX. Confirm your cylinder bore is sized for a 76.50 mm .020 overbore before ordering.

Q: Is this an original Kawasaki part? A: No, this is an aftermarket Wiseco piston kit that cross-references OEM number 549M07650. It is not produced by Kawasaki.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.