Quote:
Originally Posted by elefantrider
Engine likes idle mixture screws 2.5 turns out. Was previously at 2.0. Screwing out a half a turn improved the stumble a little.
3.0 turns was a little too fat.
Idles still at 1250 RPM hot, minimum.
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Take a flash-light and look into the venturies for fuel dripping from the main nozzles at that idle speed.
If it drips your engine is running partly on the main circuit at idle and the idle circuit is partly out of play.
Then the cure is to enrich the idle circuit so that the engine will run only on the idle circuit at idle speed.
Also, i would prefer a timed source for the vacuum advance since the intake vacuum suffers from the camshaft used and wont fully activate the vacuum advance at normal idle speeds.
Using constant vacuum for the ignition vacuum advance with this cam and the timing will drop like a stone under certain rpmīs, usually where we want the idle speed, and take the rpmīs further down due the lack of ignition advance..