I used to have what you describe.
Changed the spark plug gap from 0.92mm to 0.75mm.
Never does it now.
Bonus besides the smooth take off's & 1 --> 2 gear change is use of higher gearing and recent tyre tread depth measures on the front wheels has shown a marked improvement in wear rate (because of no wheel spinning, particularly the left wheel which always seems to spin). Throttle no longer does maybe I will, maybe I won't. It just goes.
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