Lost compression - after head change

[John Mason]

Bob, Have you done a compression test to see if all four cylinders read roughly the same. Also a dry then wet test (Wet test is after a squirt of oil is put down each spark plug hole) If you get a much better reading after the wet test then you know it is the valves not seating correctly.  With high compression head it will find weak spots in poor gasket fitting or poor seating valves easier than with your previous low compression head.
If you have fuel and spark after cranking it over on the starter for a bit with ignition switched on if it doesn’t start take a couple of plugs out and see if they are wet with fuel. If wet and you have petrol put a small amount of new fresh petrol into the plug holes refit the plugs and try again. I think you should at least get a cough or splutter.


John Mason