When u press the key in to start, it actually spritzes s little gas in the throat of the carbs not sure if all three or just middle one. It s not a choke butterfly in the normal sense of the word. I would verify that all of that system is working.
I had a 84 & 94 carbed merc 150, they were both a little finicky when cold. What i would do is pump ball till hard, turn key on and press in 3 times, advance throttle lever about 1/3 up and then spin starter. After they were warm, just bump the key.
I d be careful with the starting fluid, usually not a friend of 2 strokes.
Maybe some of the really smart guys will come along and chime in
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