I adjusted the compression relief tonight.
It definitely wasn't doing anything before.
After adjusting, if anything I made it a little too tight, there's about an inch of free play before it starts opening the valves. Before I could pull it all the way out... Like 4" and nothing would happen.
It took a little bit of figuring out since when I loosened the locknuts the first time the arms came off the flats of the cam.
I ended up taking the whole valve cover off again and making sure that everything was functioning properly, luckily I made the new fuel line about 1/2" longer yesterday so I could squeak it out without having to bleed the line again.
Then removed the linkage between the 2 arms and adjusting them separately.
I forgot to take a picture of the timing marks on the fly wheel yesterday, I was worried they would have been marked in Japanese characters being a grey market tractor but they were marked normal.
I followed the instructions for a B5100, B6100, B7100 that Lil foot posted when someone else asked the same question.
From my B5100/6100/7100 service manual:
(for what it is worth)