What's mu ney "cc" of my engine

[Buffalo400]

I made rebuild my engine last week and I want to Know what,s my "cc"... it,s a honda piston #(131021-kcy-670 piston 0.25 0.25)

I think it,s 407cc....
Thank's a lot gentlemen

[honda250xrider]

its bore * bore * stroke * .007854 then that will get you your cc's

[honda250xrider]

well i think the size of the stock piston is 85mm. so 85.25 * 85.25 * 70 * .007854 = 399.5cc's so the answer to your question is you have 399 cc's if im wrong someone please correct me