In addition to the symptoms the others note, a non-functioning vacuum advance can cause the engine to backfire out the exhaust when the throttle is suddenly closed from governed RPM.
Check by sticking on a timing light then noting the timing mark location with the engine idling. Now disconnect the vacuum advance hose and check it again. If the vacuum advance is working, the timing will mark will retard noticeably when the hose is disconnected.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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