I have read that Pre 1983 HP was determined at the flywheel and after 1983 at the prop shaft.
If this is true then can I expect my small boats speed to increase significantly if I replace my 2003 2.5 hp
Mercury with a 1981 4hp Jonhson?
Quite a bit of carbon build up, I was able to poke each ring with a small screw driver and they have some spring to them. Gonna clean, resurface , and replace gaskets and retest. Gasket seems really old.
I rebuilt my 1960 JW-16 3hp Johnson carburetor and everything appears to be clean and components all correctly set.
I have to pull the choke out to start it and even then it only runs for a few seconds and then the carb floods with fuel.
Fuel runs out the choke side bore behind the air silencer...