Added 4 oz of Seafoam to my gasoline tank. Ran the bike through most of one tank with the Seafoam inside. It seemed to make a fair bit of difference with the way my bike accelerates and uses the throttle. It feels much better and more responsive now.
Oil change after the seafoam
Drained and replaced oil and filter. Oil is standard 10W40 Napa brand. Filter is standard Napa filter. Odometer read 26311.7 miles.
Getting rid of the 50 weight
Drained out 50 weight oil and replaced with 10W40 Napa brand oil and 4 oz of Seafoam. Let bike idle for 20 minutes and exercised gears and clutch before taking it to the football stadium parking lot. Did seven miles worth of parking lot riding to free up the clutch and allow myself to shift between the different gears again. Did five miles on the road to get the bike up to 55mph.