Larry,
If you have the early carb then I would assume you also have the long cylindrical air cleaner, as shown in the manual. When I got mine the felt filter element was so contaminated with accumulated muck that it was literally solid. I tried washing with petrol but that made no impression and, in the end, I obtained new felt and remade the guts. I could not get the correct thickness of a suitable filter grade felt so I used a double thickness of a thinner material.
I am not suggesting that a clean filter will solve the problems that led you to start this particular topic but I can assure you it will make for much more efficient carburation when you are running.
B…………..