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58.8mm is the largest size bore that can be installed on the GY6 engine without boring the case or a 58.5 but what is the point without a Stroker Crank. Just slapping in a 58.? is only going to give you about 5-6 more ccs around 156cc over 149.6 OEM. That will not even be noticeable to tell you the truth.
Lefty
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You’ll never be old and wise if you weren’t young and crazy
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