Hi,
The 400/4 can be taken out to 500cc with new liners, but 466cc is the biggest size that the maker's liners will take before there are heat and weakness problems, a lot of clubman racers used the 500cc size, often made by y0shima in america. As for cruzin image, I would certainly consider them if my Yoshi 460cc pistons give trouble, as they will allow me to clean the bores out.---------Ken