Welcome Baker.
11 gram sliders and the red spring will do well. The Dr. P variator will do very little in terms of improvement. The A12 will be a good investment as well.
Not hard to install. Yes you will need to rejet the carb after install.
But you will get best gains if you've done the other recommended stuff as in gutting the stock muffler or another exhaust, redneck intake, and also port matching the intake manifold and exhaust header will really reap the benefits of that cam. As well as a port and polished head.
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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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