Depending on which one you want to upgrade. The Sunl might be the difficult one to do any engine upgrades on since many of their GY6 engines were of the series B and not the common series A used in 95% of the buggies. Not sure what series the 160 is but I believe it is the odd ball GY6. The candy however will take any of the engine up grades available for the GY6 except the later models with internal reverse will not accept the stroked crank but heads, big bore, and cams will work fine in the Kandi.
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