Sounds like you bought it?
We need pics.
Choke is just threaded into the stock carb. Unscrew the cable where it meets the carb body, then pull the cable up and out.
There is adjustment for the rear tires.
Have you found the on line repair manual?
Leak down test basically is blocking off the intake and exhaust AIR TIGHT. Then install your vacuum pump on the pulse fitting of th engine (vacuum hose port for fuel pump)
Pull about 5-6 inches of vacuum (or 5-6 psi of pressure) and let it sit. Check out the gauge after 10 mins. You shoul lose just 1 or 2 inches or PSI in that time. If more is gone, you have an air leak (bad seal) somewhere.
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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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