So, I finally got the 33mm carburetor on the XL350 tuned in and did a 200+ mile ride yesterday on one spark plug....Woohooo. The bike did fine, but with the air screw out , I can only top out at 75 as opposed to 85 before. But I like not having to change spark plugs every 100 miles too. With only 5100 miles on the clock in 40 years, this way by far the longest ride ever for this bike.
So, with this, I plan to take a two or three day trip on the XL350. More to come on this trip.