Sorry for the necro lol but it was appropriate 
Thanks to this thread and another on iBoats, I installed the carb from the Force 50 to my Force 40 today. Everything worked great! Picked up 4mph and +200rpm, running what seems to be 5800rpm, a little higher than it should be. I'm running a 15 pitch prop and will try a 16 or 17 pitch next.
Attaching pics of the 50hp vs 50hp carb. Hope this helps someone else someday.
Thanks to this thread and another on iBoats, I installed the carb from the Force 50 to my Force 40 today. Everything worked great! Picked up 4mph and +200rpm, running what seems to be 5800rpm, a little higher than it should be. I'm running a 15 pitch prop and will try a 16 or 17 pitch next.
Attaching pics of the 50hp vs 50hp carb. Hope this helps someone else someday.