The 2004 KX125/250/250F and the 2004 RM-Z250 suffer from a linkage curve that is too aggressive. Have no fear, Pro Circuit has a cure. Its linkage system will allow the shock to blow through that harsh spot and boost the bike's overall stability. The complete system is $439.95. Other arms are sold separately ($184.95) to lower the chassis angle.

909/738-8050; www.procircuit.com