KX125 Phathead Set 1998-00 KH12598 This Phathead set fits Kawasaki KX125 1998-00. Phathead sets are CNC machined from 6160 Billet Aluminum. They feature interchangeable domes (combustion chambers) with different compression ratios. Phathead sets include a Phathead body, your choice of two domes, o-rings, all necessary hardware and installation instructions. The KX125 1994 and 1998-00 came stock with a flat top piston. The standard two domes for this set are the H12 (7.6cc) the dome closest to stock, and one step higher compression H13 (6.7cc). The higher compression domes available are the H14 (5.8cc) and H15 (5.0cc) domes. When selecting domes, the smaller the cc the higher the compression. To order a Phathead set choose the color of head body with the drop down menu below. Enter the 2 dome sizes you want with the set. By entering no dome selection defaults to the standard set of domes. WARNING. When using the higher compression domes you must run high octane fuel. Running low octane fuel in a high compression engine could cause serious engine damage. Experienced motor builders, to view a list of additional dome options available for this head set go to the H1, N1, K1 or W1 series domes COMES IN ALLOY RED BLUE BLACK AND GOLD