I just got my sprocket and retainer in...the one at the following link... http://www.ebay.com/itm/291068614228?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT ...and I now need to order a centrifugal clutch and chain for it. Best I can gather is the sprocket identifier is the number 415....is that correct, or are all these type sprockets 415? If so, is that all I need to look for when ordering the centrifugal clutch and chain or is there more too it? FWIW, it's going on a trike with a 3 horse 4 stroke so any advice on the amount of teeth I need on the clutch would be helpful as well. Thanks for any help.