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Fredrik;
Since the fuelbowl of most carbs are vented to the atmosphere (pressurized FI systems are sealed), they will always dry out during anything over a month or so of not running the car. Sometimes, the gum and residue it leaves behind can bind up the bowl valve so it may be tough to refill the bowl on start-up.
To answer your question about a "base setting" of ignition timing which will help in starting....obviously if there is no fuel, no amount of playing with the timing will help, but the trick of backing the timing way off (just for starting) has been used by people with ultra high compression engines, or during ultra cold, to help them start for years...in both cases, it fires the cylinders at or even a bit after TDC, and thereby helps the starter by preventing ignitions while the pistons are still on the way up on the compression stroke (during dead slow cranking, so the starter would still be working against the power stroke, since the flamefront and resulting cylinder pressure resulting from ignition BTC is quite fast!). Remember, the engine is really timed in the anticipation of at least idling (much faster than cranking RPM), where by the time the flamefront and pressure develops, the piston has already gone over the top....
After a car is started this way, timing MUST be set correctly, before running engine under load.
Cheers
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