In reply to MarkB, another reason that vacuum advance was use on road vehicles was a bit different. Many cars supplied vacuum from a ..ported.. source on the carb base. In this case at an idle the opening to the port would be just above the throttle plate so it would not be subject to manifold vacuum. As you open the throttle to start the car in motion the throttle plate edge would move above the port supplying vac to the advance. This quick advance of the timing helped with off idle stumble or bog. The main jetting of a car carburetor is somewhat leaner than that of a tractor, this helps vehicle fuel economy. The ported vacuum and accelerator pump in the carb worked together to overcome the stumble that would otherwise take place coming off idle. And no this does not apply to tractors, but is very inline with the question asked. For the original poster I would suggest he go into Modern view and edit his first post to read ..his 300 does not use a vacuum advance.. Just a suggestion.
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