Running rough at lower revs, seems rich from the plugs, float level queries

[stevierst]

My Thundercat did similar until lat night.
She was a Bugger to start, and ran like Shit on constant throttle (stuttered/vibrated until throttle opened). There was also a stronger than normal smell of fuel.

I stripped it all down and inspected the diaphragm rubbers, checked for air leaks etc, etc.

It turned out that the carbs for some reason were well out of balance (only did them last week).

I'm not saying that's what's wrong with yours, but start with the simple stuff first. It's got to be better than stripping the whole bloody thing down like I did.

Good luck 8)