I have a dial back timing light —Old sunpro. I didn’t trust it, so I made my own timing tape. Got the same results. Idle is set to 700 in drive, 850ish in neutral/park. I have summit springs on it, I didn’t use their weights. I’m currently using one heavy spring and one medium spring. I have tried various combos on the springs, but the results are the same. Advance comes in all of a sudden, around 1600 rpm. I have cleaned and lubricated the weights and still no matter what combo of springs, it throws the advance suddenly and stops at a total 10 at the crank. I have taken it up to 4K rpm, but only maybe a degree of change.
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