Spark Plug Gap on Older Motoplat's & Femsa

[weimedog]

What is the recommended Spark Plug gap's for these old ignition systems from the 70's and 80's?

How much can spark plug gap effect performance and starting?
How about life of the ignition system?

 

[Husky Texan]

.020-.024 for all of my Motoplats (Maico/Husky)