You'd NEVER find a post like that on a Kawasaki board!--grrr--- i'm an idiot ... ares is pi r ^2 ... so -REVISED-
73.4 mm -> 7.34 cm.
use Pi(r^2) for area.
r = bore/2 -> 7.34/2 -> 3.67.
3.14159 x 3.67 x 3.67 -> 42.3137
area x stroke = volume; stroke = 59 mm -> 5.9 cm.
42.3137 x 5.9 -> 249.6508
249.65 * 4 (four cylinders) -> 998.602