Actually those Tecumseh "sport" engines found on the Yerf 3203 are not the greatest. They actually have a pretty short service life. If memory serves me correct, they were only rated for something like 100 hours.
I actually installed a NEW $100 (bone stock) Harbor Freight "predator" engine and gained a couple MPH over my Tec engine that I port matched the intake and exhaust manifolds.
There are many aftermarket parts available for those since they are Honda clone motors.
Might want to look into that.
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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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