WISECO PISTON PK KX100/RM100 52.5MM PK1154 Offroad 2-Stroke &gt; ENGINE &gt; Pistons &gt; PK KIT Size: 52.5 Application: 98-06 KX100/03-05 RM100 52.5MM (651M) Wiseco Piston PK KIT PK1154.