Idle adjustment wont cure carbon above 2000 rpm
Remove the top of carb & take out the 2 main jets and write down the # and tell us. I think the primary any should be less than 145.
Re: Idle adjustment wont cure carbon above 2000 rpm
Good point about the idle adjustment: most of my driving is back roads, so the carbon is building up at speed. I will check the jets.
The timing had been a few degrees retarded, and then I set it a few degrees advanced to give better acceleration. Could that be the problem?
a few degrees wont cause that problem.