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For your signature it is still a 150cc with the mods you have listed. It will only change one you change the cylinder size. Or the stroke. The stock size is 157mm ish I believe. You can go up to a 159mm and it make it a 158cc roughly or they have bigger cylinders but most require machining to go bigger. Ccs is a compacity (sp)? Of air that will fit in the cylinder. If some one has a better explanation please feel free to correct/ help me. The stroke is how far the piston can travel up and down in the cylinder. So the farther the stroke the more air that can be compressed in the cylinder adding more ccs. And with the stroke your only talking adding 2- 4 mm but it increases the cc out put of the motor much more than the diameter of the cylinder. But to do this splitting the case is required. By doing these things greatly depreciates the life of these little motors though. I hope that makes since.
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