If you just replaced the rings then your pistons and cylinder bores could easily be worn so far out of size and roundness that you will NOT have compression.
When your tearing down a engine that is not running correctly you need to inspect and measure wear items, pistons and cylinders bores< before you install parts.
For roundness you really need a bore gauge but you can measure the piston clearance with a thin steel feeler gauge.
So check your timing and then do a cylinder leak test. I am thinking your piston to cylinder bore clearance is too large.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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