I have not charted how my advance is working, but I do know as i watch with out the vacuum advance hooked up that the centrifugal advance is working smoothly, Just not charted. And as for the vacuum advance I don't have a hand vacuum pump but if i suck on the hose and watch the advance I do know it is working as well. as for my burn it is on the lighter side of gray, and there is little to no deposits on the plug. if you follow the electrode on the plug around it is past the bend before there is much of a deposit, chocolate milk in color for about .050 and then a line about .010 of clean, then more of a deposit, that looks about like chocolate milk
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