I got my 250 started, checked everything and it appeared good. when out on my first ride and after about 9.6miles the timing chain was a tad loose, chewed through my valve cover and rattled the entire valve train loose. Cam bearings are shot. Lost a nut to the valve adjustment screw, and a cam cap cracked. So now i need a complete head or even just a complete motor which both seem impossible to locate. Are there any other klr, klx, etc engine that will fit in with lil modification?