Dude, really need pics. Not sure what "clip" you're talking about on the float valve (needle/seat)
82mm is the largest you can go, yes, before needing to re-sleeve the cyl
Rings are size specific to the piston. Usually they come with the piston kit, but you can also order them seperately if need be. 81.5mm piston must use 81.5mm rings, 82mm piston, must use 82mm rings, etc.... Trying to cut corners here would be a bad thing
More than likely your cart is a 4 stroker, very very few small 2 stroke engines. Lawn Boy lawn mower is the only one I can think of.....
2 strokers smoke because the oil is added to the gas either by premix (adding oil to the gas manually, or with an oil injection pump. That would be a seperate tank for 2 stroke oil to be added) 2 strokes normally have a large blistered exhaust pipe/expansion chamber. They also often sound like chain saws when running.
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My Yerban assault vehicle: 2.2mm stroker crank, 62mm Nikasil cyl, Taida large vavle head, American made valve springs, ported intake manifold, TM 28mm carb, stock CDI, Bando coil, TK exhaust, stock CVT except for the 14g sliders, 13/40 internal gears, 16T drive, 31T axle sprocket, 22" rear tires, and ONE BIG POTATO CANNON mounted on top..........
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