The lever is mounted under the horn button, and I push it outward (left) for a cold start and inward (right) for normal running.
How much slack is in the enrichener cable, should be about an 1/8th inch, sliding the adjuster in and out of the plastic bracket.
If all other systems are up to par, in a 70f degree and UNDER cold Start one would ensure the fuel is turned on, pull cold start lever Full Left. Engage the starter button, for at least 5 full seconds or start-up which ever comes FIRST. DO NOT Open the throttle! Do Not tap-tap-tap the starter button. CRANK IT!
If the engine doesn't start in 5 seconds, release the starter button. Count to 10, slowly. Crank it, again. At 4th second just "twitch" the throttle open, A Hair. Not a lot!
Too many people 'play' with the throttle during cold starts! There is NOT an accelerator pump in the carb like a '67 Mustang or Chevy! Playing with the throttle TOO early defeats the enrichener.
But, if one must always "twitch" the throttle open on the second or 3rd attempt at cold start up, it may be an indication of Low compression and past time to adjust valve clearances. Measure the compression BEFORE and After valve tappet inspect and adjustment.