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honest ? whats the diff in a big bore kit vs. standard kit?

takes a 91.5cc to 98.5cc (ms660) or a 78.5cc to 84cc (dolmar 7900)

3.14 x (diameter of piston/2) squared= area of piston surface, so the extra 2mm adds a bit of displacement


3.14 X (54/2) squared=2289 sq. mm

3.14 X (56/2) squared=2462 sq. mm

so the % gain is 2462/2289=107.5

multiply current cc of 91.5 times 1.075=98.4
 

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