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Old 08-08-2018, 08:48 PM
JOHN COOKSON JOHN COOKSON is offline
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Problem: Rough idle
Theory: There is a points problem
Test of theory: Gap the points correctly then test the dwell. The dwell should be close to spec. The gap may need to be adjusted a couple of thousands to get the dwell correct. If the dwell is not to spec when the points are gaped to spec there is a problem. Possible problems: worn rubbing block on the points or worn distributor cam. Then at the carburetor adjust idle speed and idle mixture. If a satisfactory idle can not be attained there is another problem somewhere (see list in pervious post). This is how I got my idle down to 575-600 RPM.
Comment: Stephen, you are on the right track here. Sometimes one can get a engine to idle by speeding up the idle RPMs and\or adjusting the idle mixture. This will only mask the underlying problem which usually will only get worse not better.

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