You're getting some sound advice on your question from these guys.
Let me just add that the valve springs seem to be a weak link (in my case at least) when you start revving the engine that high. Valve float is an issue.
In one instance, I bent a valve (fortunately didn't damage head)
On the other, it was a completely destroyed head and piston.
So if you decide to spend some serious $$ and get a head set up, I suggest stepping up and getting QUALITY valve springs too. Talk to Tom at Syc Powersports for a good set of springs.
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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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