Actually, I wouldn't know what to do to the existing engine. It's pretty "tweaked" already.
I'm afraid I would need to do an engine swap to see any major gains.
Only things left to do on this one would be a slightly larger piston (83mm) and a longer stroke crank (2.2mm already installed) Possibly a 4 valve head?
Not much gain for the $$$ invested.
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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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