Reply To: 1941 Mercury KB-1A carb choke?

[green-thumbs]

My reprint of owner’s manual for 1941 Merdury KB-1A  shows only ACON nut, The jam nut is NOT shown or listed, Probably a later field fix by clever native craftsmen, One caution, the manual had to be prepared before production began. It is possible that jam nut is as it left factory. A survey of known original motors might or might not resolve issue as production and field fixes might not apply to all motors.

For lack of data on observed original examples, I would go with the manual and say NOPE

 

Louis