I picked up a 1980 GS550E for $100. Set about getting a title and making it legal and started ordering a few parts for the rebuild. I learned about combining the 550 engine with a 650 top end and, while reading on that, I found out about the GSX750F swap. There seems to be a few people who've done it but actual information is scarce. Screw it, guess I'll learn as I go! I found a more or less complete 2000 GSX750F (Teapot to you guys, The "K" word over here in the states) and snagged it. Here are the two donors. 1980 GS550E. Super oily engine, major wiring harness issues, etc. But I think it's a handsome bike. Or, could be. 2000 GSX750F Not running. Says the carbs and tank got dirty (and I see evidence of that) and he burned up the starter trying to get it to start. But the engine is clean, wiring harness doesn't seem hacked up, except for some of those hideous LED strips, and I have front and rear suspension I can play with.