229 is the max that the CG can go. Remember that the CG was born as a 125cc.
What people do to get more juice out of the 229cc, they put a crf230 piston, they workout the carter to make it a bit bigger, custom cams, custom connecting rods, port and decked head, better mufflers, better carb.
When fully customized they can reach quite decent speed (for this type of engine), also they can reach about 62 mph in about 8, 9 seconds, which may not be too fast if you are used to bigger CC motorcycle, but again it's just a 229cc
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