Ok, got this narrowed down to three. You guys take a look and tell me what the differences are. thatsdax.com (guy is not real complete with answers. The DAX f80 stage one (disorganized site, gotta just look for it.) This one seems expensive and I found very similar looking motors elsewhere. Ebay http://www.ebay.com/itm/222456768705?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT And.. this one, (I actually like the black paint.) https://www.gasbike.net/collections...80cc-angle-fire-slant-head-bicycle-engine-kit Now I swear the actual motors all look the same to me. So what's the difference?