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There should be a roll pin on the pulley.You can use that as a guide.Line it,centre of the distributor,centre of flywheel and timing mark,three dots on
I did find the 1979 25hp
I personally don't recommend the finger-in-the-boot test but for those who do it they definately find out quick if they've got VOLTAGE.
My experience tells me that if there is a demand then aftermarket parts will be available.---------No demand on original quality parts then no one is
racer should know better but I did a search also and for the 1985 20 and 25hp had the same size jet but the only difference I could find was the manifold