Rode it with Allison and couple other little jaunts was getting a bit of hesitation on acceleration and it had started to kill at idle. checked plugs found one was an R changed that to a BP7ES both caps read 5K ohms.
Oddly the BPR plug is the slightly better looking one, but both looked fine.
Reset the idle mix to the factory 1 turn out from the 1 1/2 turns where I had it.
I also raised the needle clip from the stock 4th to the 5th and final slot. Nice that on the early carbs that can be done with the carbs on the motor. did a little adjusting equalizing of cables and stops.
Decided I needed to take a look inside the front brake. It was stopping but I was hoping for a bit better, stronger action.
Well everything was in good shape inside.
Some rust, brake dust, grease residue, cleaned everything up, used coarse sharping stones and mineral spirits to derust, smooth the inside of the drum. Reduced the ridge where the shoes don't scrub. Sanded the shoes, broke the glaze. Shoes had lots of pad, were making full contact. Cleaned and lubed the cable, worked it extensively for smooth no bind action. Did a bit of metal clean up and polishing on brake shoe pivot points, the pivot surfaces on the shoes were pretty crude from the factory. and slightly rounded the corner on the actuator cams to more closely resemble later cams as used on the rear of newer XS's, These cams had a sharp break from the flat to the cam profile I just didn't feel that is the way it should look or work. When installed and adjusted the cams are already tipped towards the profile part. But the sharp corner was leaving a dent on the flat plate of the shoe. Made a very light application of synthetic brake grease to pitots and cam faces, I did not remove the cams from the backer plate there was evidence of fresh grease and action free and smooth. Buffed the outside of the backing plate, long as it was off.
Assembled, adjusted per the factory manual. That's bit of an art balancing the two shoes to contact the drum equally. Manual sez listen to both shoes and balance the start of the rubbing sound! Rode it.
Will need to put on a 100 or 200 miles and do some serious stops but I think I'm going to be happy, noticeable improvement.