The shaft should rotate freely, but it should not slop around. There are a pair of bushings in there, and if they are worn the shaft will wobble, which makes the spark timing go stupid. There is also an advance mechanism in there, both vacuum and centrifugal. If the centrifugal weighs are messed up, that could also cause you some problems. You should be able to pull the plate where the pickup sits out and inspect the mechanism. Its been an extremely long time since I was into a Duraspark dizzy but I want to say there is a plate in there that limits the advance, a couple of weights and a couple of springs. You should be able to pull the weights out and see the distributor shaft rotate a bit. If the weighs are stuck out, probably the springs broke or it rusted up. Chebbys were good for rusty advance mechanisms or flats worn onto the weighs that caused them to jam.
Um, you said 8 degrees after top dead center. It should be around 10 before top dead center. If you're 20 degrees off whre it belongs its gonna not run for shit.
The idle is way high. 800 rpm is at the high end of where I'd want to see, 1100 in gear is much too much. Around 700 is where I'd expect it to be.
Set the timing with the vacuum unhooked. It sounds about right honestly towards the end of the video when you unhooked it.
That full manifold vacuum advance shit always confused me. I know Ferd did that for some reason, but I was always used to ported vacuum where you had basically squat at idle and it came on more as you got into the throttle. If you've got the option, maybe try swapping the connection to ported.
Um, you said 8 degrees after top dead center. It should be around 10 before top dead center. If you're 20 degrees off whre it belongs its gonna not run for shit.
The idle is way high. 800 rpm is at the high end of where I'd want to see, 1100 in gear is much too much. Around 700 is where I'd expect it to be.
Set the timing with the vacuum unhooked. It sounds about right honestly towards the end of the video when you unhooked it.
That full manifold vacuum advance shit always confused me. I know Ferd did that for some reason, but I was always used to ported vacuum where you had basically squat at idle and it came on more as you got into the throttle. If you've got the option, maybe try swapping the connection to ported.
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