Wiseco Piston Kit 58mm 11:1 Compression for 2003-2006 Kawasaki KLX125 4815M05800

If you're running a KLX125 and want measurable gains in acceleration and reliability, an 11:1 compression piston kit is one of the most effective upgrades available. The Wiseco 4815M05800 delivers forged aluminum construction that handles the stress of higher compression while maintaining the lightweight characteristics your bike needs. This is a complete kit with rings, wrist pins, and circlips—everything required for a proper rebuild.

The 58mm bore is sized precisely for the KLX125 platform, and the 11:1 compression ratio pushes real horsepower and torque gains without requiring engine modifications beyond the piston swap itself. Whether you're prepping for trail riding or looking for snappier throttle response, this kit gives you the durability and performance that come from Wiseco's decades of racing heritage.

• Bore diameter: 58mm
• Compression ratio: 11:1
• Material: Forged aluminum
• Fitment: 2003–2006 Kawasaki KLX125
• Kit contents: Piston, rings, wrist pin, circlips
• Installation: Bolt-on (engine removal required)
• MPN: 4815M05800