The old method of kicking the engine over before trying to start was to draw some mixture into the cylinder and inlet port so once the engine kicks and fires, fuel is right there to use.
Every engine/carb/intake/exhaust combo has its own ittle tricks to be a good kick starter. The S&S carb on my harley (accelerator pump) is totally different than the TM 32 on my '08 or the BS 29 that was on it previously.\
I have found after a LOT of experimentation (& I mean a LOT!) that my AVL does not want ANY priming kicks (at the most only one) or it will foul the plug & the engine will NOT start until a new plug is put in. I've proven this by going through minny, minny plugs. Luckily I found a cheap source with free shipping.
The SS on the other hand wants various prime kicks or throttle squirts (or none) depending on the engine temp, hot or cold, how long its been shut off (when you twist the throttle on an S&S you are actually squirting raw gasoline into the intake, not so with the Mikunis).
Each of the little beasts has its own idiotsynchrousies