You can also add another ground wire or strap from the engine to negative post of the battery for good measure.
Might I suggest you clean your ground bolt threads and chase the threads inside the engine case to clean any debris out. And do not use any thread locker (Loctite) on it as that may be preventing you from having a good contact.
Just a quick thought. Your bolt isn't loose or stripped out is it?
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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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