Well, my set up is listed below in my sig. I'm right around 40 MPH top speed, but it gets there pretty quick.
In my opinion, if you want torque, build a stroker.
If you want speed, build your HP and MAX RPM.
Either way, just to be safe, get the good valve springs from TOM at Syc powersports. Well worth the $$$.
I bent valves twice with other "performance" valve springs installed.
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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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