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Options 1: Strip the cart down repaint it, run the new predator motor or possibly something slower for my daughter. Finally figure out some type of better braking system other than the questionable drum brake band that keeps slipping off (suggestions). I understand the only real solutions is to install a live axle on this cart which leads me to OPTION #2.
Option 2: Buy a 2 seater roller with a live axle and transfer the predator motor to that which will provide my daughter with a better braking system.
I also wanted to know if the two piece wheels are normal / original wheels and tire size. 4.10/3.50 - 5.
Don't listen to these other guys, they're turning molehills into mountains and needlessly complicating this endeavor of yours. A band brake on a clutch bell/drum? While it's a novel, space saving design, anickode already deconstructed that nonsense for you.
The band brakes are good if you can get them to line up well. The good ones have "ears" that are bent inwards and serve to keep the band aligned on the drum. You also have to make sure your brake rod is not bent or pulling sideways. Make sure it is pulling straight fore and aft.
There's other ways you can ensure proper operation; fabricate some kind of guide lip, plate or tack-weld on a small rod to keep the brake band aligned.
The two piece wheels and tire size seems to be normal. Did you even look at the manual I provided? They're stock/OEM/Factory.
It's a good tire size as they are cheap and easy to change on account of the split rims, even though the requirement of inner tubes sort of adds complexity. ALSO--don't get all hung up on the
CHENG SHIN name on the sidewalls. CS has been around a long time; since the 1960s and they make a quality tire. They're Taiwanese, not Chinese.
This kart is perfect for your daughter. I thought you were going to totally remodel it for
yourself on account of the "hydronic" brakes, live axle and what-not.
However....a live axle kart won't turn well at the low speeds you want to keep it at. It just won't and your daughter will struggle with it. It has to be really moving to execute a turn...
Good luck and...break a leg.