Uh guys,
If I was going to use a carb, I would
not choose a Demon. I tried for several months to get an 850 Speed Demon vacuum secondary carb to work on my mild 521. Took it to experts. Called, wrote and visited BG in Dahlonega. No joy.
Finally switched to fuel injection.
Were I to do it over again I'd try anything but not a Demon...
Tom