Cold starting.

crackedback said
Runs exactly how it should when cold with a decent tune up.

The only alternative is to fatten up the idle mixture screws, then it's really fat at idle when warm.

Which is the better alternative, the current set up or a fat when hot situation. It's not the second one...
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This. Fatten up the idle mixture, not the main jets. I have had good success with this, provided you dont have too much mechanical advance, have sufficient initial timing and the throttle plates are closed enough at idle so that it is actually idling on the idle circuit.