Recently acquired a junker maxi that came with an original bing 15 and a bing 15 clone with 217/82 and 222/57. They both seem inappropriate for a 14mm port with a 12mm intake. Do they have any value as FS items? Seems like bing 15s suck on nonkitted bikes, whereas 14s are ok. Thinking I should either go back to the original bing 12 that was in the bike, or a 14, or get a Dellorto.