The best thing to do is to increase engine power with a port and polished performance head with a performance camshaft, and if you have weak compression you could go with a big bore drop in kit which will enhance the head and cam work. Don't waste your time and money with performance cdi if DC volt or hot coil. After you increase engine power than you can fine tune with appropriate rollers and torque spring. The GY6 150cc engine was designed for a scooter, 100 pounds wet. Now you put this engine in a 3-4 hundred pound buggy which will work fine for small kids. Big kids need more engine power.
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