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Rebuilt an old Yerf dog go kart for the grandkids. It has a new 212 Predator motor, torque converter that has 12 teeth and 35 chain. It has 20 inch rear tires on it. With my daughter test driving it, 125 pounds, it slowly rolls and increases speed ok. but when you slow to turn around it comes to...

I have a 2001 yerf dog 40000 go cart. It has a 90cc, 2 stroke motor. What would it take for me to switch to a 6.5hp Predator engine. Can this be done using the existing sprocket? Has anyone done this swap? Project for my grandsons.TIA