Yes 83 was final step to the 1200 run, close if not the same as 1200's, but 84's were geared a little different than 85-87 in trans. Sold both of the 81's I had over the years, & replaced with 12's, much better suited to my liking. That's been my interest in single carb, with 1500 swing arm back like we spoke of, as 12's could use some help on bottom end. They have plenty of top, way more than later models, & better fuel management would help on both. :yes: :good: