Since one cylinder has 90 lbs of compression it should at least fire on that cylinder. Many one cylinder engines mow lawns weekly all over the place. Of course the one cylinder of those engines is not dragging along 3 others that are not firing. The one that has 40 lbs should hold its own. Now if the other two have leaking intake valves fouling up the fuel air mixture that adds a bit of difficulty. Pumping air in the cylinders when they are TDC will tell you whether they are leaking into the intake or exhaust. You have posted quite a bit on here about many various mechanical repair items, I can only deduce that you have made sure there is at least gas getting to the carb and spark to the plugs.
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