Having 1300 miles on my 1994 KDX 200 I thought is was time to check compression. According to my manual the minimum compression should be 119 psi. After removing the seat, gas tank, warming up the engine(with remainig gas in carb), and securing the new compression checker I found the highest psi to be 90. Are there other things that could cause the compression to be low (ie, inproper back pressure in silencer due to packing material, head gasket leak, etc.)? I was going remove the head, inspect the cyclinder/piston for unusual wear (repair if necessary) and replace the rings. Are KDX rings fairly generic when buying or is there a certain brand/type I should buy. Where is the best/cheapest place to buy rings? Thanks so much for your input,
mlhend1
mlhend1