What will cause a low compression reading on a ford zetec engine?

I have checked the valve timing and it is ok.

Answers:
It could be bad rings, carbon buildup on the valves, a blown head gasket, a loose spark plug, a burnt valve, or cracked piston. A leakdown test will help you find the source of the compression loss. After pressurizing each cylinder listen carefully for leaking air in the intake and exhaust manifolds, into the valve covers, or oil pan and check the radiator for bubbles indicating a blown head gasket.
sounds like ring's are stuffed
new piston rings are needed the seals around the piston that keeps the pressure in

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