You kart/buggy came with a 6.5 hp engine and almost the same CVT. It should run about 25-32 mph's. Adding a larger engine adds more money!!!! when you go bigger than a 3/4" crank shaft output the CVT gets seriously more expensive.Unless your kids are very large individuals then the 6.5 should do ok. The Silver Fox wasn't a rocket from the factory or designed to be.
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