My 60 was sputtering a few times on the trip.
I read up on it on Mud last week and Beno and I went through all the things that it could be yesterday.
Took it to Lou's. Drove great. 1/2 way home it started sputtering bad and only ran smooth with accelerator on the floor.
I'm gonna toss a new CityRacer carb on it. My current one has about 9 years on it so I guess it's time.
Still have a stock carb? Send it to JimC and wait a few months for it to come back in excellent condition. Once @beno is back in business order a new carb insulator and slap that on with the rebuild. I've had my 60 for ca. 14 yrs and recently did this and it is running better than it ever has.