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Hello All,
Her is the update the status of my 20 Hp Johnson:
1) Compression: 114/112 psi
2) Have spark on both cylinder. With the help of this forum, I will be able to get the spark of both cylinders. The update of the hardware: two new Mallory Marine Ignition Coil 9-23106, OMC OEM Outboard Tune Up Kit 172523, The driver coil (old) is still there even though I bought (OMC COIL #581130) but did not install yet. I did timing of the point based on the you tube that use ohm meter. So far I got good spark!
3) Clean the old carburetor and put it in, I could get it run for but it is hard to get it running but whenever it runs it runs good. Note: the Carb is not in good shape. I have 3 spare Carb from 1981 70 hp Johnson. By the look they are the same as 20 hp carb. I could take one of them and try out. There are a couple external hardware different and the butterfly plate which I could swap them out to match.
What do you think?