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For your go kart/power wheels/mower hybrid thing you have going on. Like Kaptin Krunch said, you might be better off going with a centrifugal clutch. If you really want ti to do wheelies, a centrifugal clutch will allow this, but it's more based on the engine and style of clutch. If you run a small cent clutch (like from a go-kart) you probably will burn the belt before you wheelie it if you have a weak engine (my girlfriend's son's go kart burns the belt when it gets stuck, but it'll also do a wheelie from a stand still with any weight on the back).
Think of it like this; go karts, snowmobiles, golf carts, 4-wheelers and other vehicles that have the
"push the gas and just go" drive system use primary and secondary centrifugal clutches. It's also much easier to govern these types of drive systems. Now I've done wheelies in go karts, almost flipped my 440 TNT when I first got it (that thing has some REAL power that I wasn't expecting!), did some awesome wheel stands in my old 3-wheeled 1972 E-Z-Go golf cart, and have ridden on two wheels on my friend's Polaris 4-wheeler in the past. All using centrifugal clutches, but decently powered engines.
You put a primary/secondary centrifugal clutch off a golf cart, and at least an 8HP engine, and I'm sure it'll do some awesome wheelies (you
are going to put a roll cage and wheelie bar on there, right?
)
