The TractorVet attempted to explain this but his self-fangled wording kind of took away from the true explanation. What he was explaining is ..ported vacuum.. Most road vehicles from the 40s up through the 70s used this. This configuration places the signal port or opening for the vacuum advance supply just above the throttle plate at idle. So for one the vacuum advance (VA) at idle is inactive so there is no fluttery idle from to much advance. Secondly, as you just open the throttle a bit the edge of the throttle plate moves over the port activating the VA, advance of the spark at this point helps reduce throttle ..tip in.. bog working in conjunction with the accelerator pump. Third, while cruising the VA continues to be activated varying with load to help eliminate detonation and increase fuel economy. Lastly on deceleration the throttle is closed deactivating the VA reducing exhaust back fires.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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