Wondering if anyone knows what the correct replacement choke assy is for my 1978 DS80 Mikuni carb? When I got the bike the choke was gone and someone had installed a zerk fitting in its place. There are a few on "the Bay" that look very similar for around 13 bucks new, but they are for TM and RM and other models with Mikuni? Are these all interchangeable? I would like to get away from sticking a rag in the air cleaner to start it. Also, wondering what the small diameter brass tube (under the choke) is supposed to connect to? Mine had a 1" piece of plastic hose stuck on it. Thanks.