I have the same Buggy (Black). I did the mods in my sig below. I weight 200lbs and I can say I can easily do a dounut in gravel from a stand still. Check the spark plug gap. I can say the coil was a big difference. I have not re-jetted yet.
my honest opinion, is check the intake manifold after the carb, you will be surprised
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KD-150GKM-2 11g sliders, Iridium NGK, Orange coil, UNI oiled filter, smoother intake manifold, drilled muffler 
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