Vin starts w/ which 8 letters? We can guess the engine family by maker's history in domestic databases.
That 63.5mm kit is using std 156 barrel (Jialing / Honda Megapro in Indonesia | std 200 barrel is taller)/ flat-top piston (std Jialing is convex http://item.taobao.com/item.htm?id=17587839133) that found in std 200 .