Hi Pongsy2003,
Did you check the valve clearance? If it is too tight, the compression would be low.
Another possibility wold be the valves are leaking and they could be due to damage caused when the cylinder head was taken off. If that is the case, you would have to remove the head and replace the valve.
Cost depends on what needs to be done/replaced.
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Monday, July 19th, 2010 AT 11:26 AM