I pulled the top end of the carb off and the accelerator pump piston is pretty tight in the bore. So much so that it doesn't move when you step on the gas.... That seems like an issue.
The problem is that the piston is some sort of silicon or rubber so I cant sand it down to size.
As for the distributor advance, mine is the centrifugal type and my manual doesn't explain how to test it. I think the accelerator pump should be the first thing I address though.
