No RPM change with carb cleaner spray on the carb-engine duct so that much is good news. Did the air filter test with no real change in performance. Ran it first with the filter on and did the 30mph in 6th with a 10 second full throttle test. The bike only got to about 44mph on the first test with the filter. Repeated the test again with the filter removed and got to maybe 45 on the same stretch of road. Just for grins I did the test again with the filter replaced and got to 46 this time. Oh, all of this with a new plug as well.
The bike seems to be getting slightly better with each run. I'm kinda big for this thing at 6' and 295lbs but I thought it would do more than this. I'm guessing a valve check is next?