best motor for a 2 seater go kart

[Gokartnoob69]

Recently i bought a 2 seater go kart which i cant find much information about it already has a 150cc motor but its to small for 2 people and its just to slow. Im new to this stuff so what would be a good option for me?

 

[panchothedog]

Believe it or not, A predator 212cc with a torque converter will power it pretty good. Adults or kids? Gross weight will make a difference. A predator 420cc will obviously be a lot stronger. How much do you want to spend?