Scott, I know there are a few Sportster kits out, but I"m not sure what size engine they are. Finding any kind of Harley kit now is like pulling hen's teeth since Harley put the shut down on most of the models due to the copyrights and the fact that they want way too much in royalties fromthe model companies now. I've been doing 1/6 scale Tamiya kits that I find on Ebay, but that has gotten so expensive I want to learn how to do resin casting so I can make my own engines from one of my Tamiya kits I have left. I'd like to get a more modern engine in a larger scale, but the Tamiya kits are all from the AMF days, except for the one Fat Boy kit they had. I'd love to get that kit, but so far the only ones I've seen on Ebay went for over $100 before shipping. The Fat Boy is the one I had my wreck on so I'd really love to find one some day at a price I could afford. At least then I would have a modern day, belt drive Harley that I could do some newer style choppers, plus have a model of the Harley that put me in the chair. Imai or Imex makes a smaller scale Fat Boy that I'd love to get too, but it's almost as hard to find. I haven't seen very many smaller Harley's than the 1200 out there. I know there was an old model of a flat tracker out, but I can't remember who made it. Keep an eye out on Ebay and you never know what you will find. With the Harley models getting so hard to come by, resin casting is the only way to go. It's that or switch to the crotch rockets, which I am building a few of now anyway. You may have to end up scratch building you engine, which for a Harley, wouldn't be that hard to do, just tedius unless you know how to make your own photoetched parts. If I could learn that process I may just go to a smaller scale and make my own. I saw a website about someone making their own engines by stacking PE parts for the jugs and then casting the crankcases and trannies. The engines sure looked good on their models.