I know from the HD sight that cam overlap depends greatly on the exhaust system used.
A good exhaust can help pull a fresh charge of air/fuel into the combustion chamber during overlap.
Overlap is when both your intake and exhaust valves are open at the exact same time.
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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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