Howdy &
Most electric motors don't use or need a clutch
...because they don't (need to) "idle"
What is a 1HP farm use electric motor?
...& maybe add some pics of your kart
FYI: Here is an "electric drive line" video that I made up a few years ago
It has a 48V 1,000W (~1.2HP) brushed motor
...a 48V 1,000W speed controller
...a couple of switches
...& 48V 35AH battery pack