Converter chain question

[NO1PITA]

As I said before, I'm kinda new when it comes to go karts.
I pretty well know the engines & such.
But I'm still not confident on some of the choices I need to make.
I have a BLACKHORSE-RACING 1" Go Kart Torque Converter.
Not quite sure which one is stronger. #40/41/420 Chain

What size chain would you recommend

 

[Denny]

They all are fine.

 

[madprofessor]

All 3 of those are 1/2" chains with 5/16" diameter rollers. The main (but very minor) difference is that #40 is 1/16" wider, and for the function of chains that makes no problem at all. The only problem I've ever foreseen would be with a #40 sprocket, if it's 1/16" wider then it might be tight for the other chains to get around. See chart in link below............
Chain for Go Kart, Mini Bike | GoKarts USA®