I think it is a GY6 engine.
https://bdxperformance.com/products/twister-hammerhead-go-kart-engine-gy6-150cc-external-reverse-engine-guaranteed-fit?srsltid=AfmBOooKtRfUKLhnj7Z62W99Q9xwluMFL4mZCmNb_S9p-vRbuOWpU82f
At least with the old Mopar car engines, the ballast resistor would cause this...