Your best thing to do is a compression test this will
tell you the condition of the valves and or rings, it
takes two times checking, first dry,  then wet, after
squirting some oil into  the spark plug hole. Note the
dry reading, say on #1, you got 80PSI  reading, then
after putting some oil into the cylinder and checking
again it reads 115PSI, this means that you have a
problem with the rings or piston, had it stayed at
80PSI this would have meant that the valves are not
sealing, burnt maybe, good luck with it. Phil

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