I found the issue. It only went to 1/2 throttle due to the mechanism that prevents full throttle when in neutral.
A part of the linkage connecting the gear
selection to the throttle linkage came loose.
A search online provided the clue.
Then it was 45 minutes actually finding it on my engine
, figuring out how it was supposed to connect, and then trying to get it back together when I could barely sort of reach it with a screwdriver and needle nose pliers.
But itís running again! And when I first lifted the cowling I found a loose nut laying inside that holds the fuel filter
. So that was another plus.