i just changed the rings. i marked the cams n put them back the where the markings were and nothing. the timing chain is stock, i believe the valves are stock i could b wrong the kid i bought it from said that it had a 440 big bore but when i took the cylinder outto get measured it was bored out to a 450 so i dont know what else could be done to it . the z400 has a t-4 slip on, cdi rev box, jet kit and it has the 450 big bore
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