Welcome to the forum, I still have the first bike I built and the original 48cc engine, but they are not together. The original engine blew a couple of crankshaft seals so I broke it down and replaced the crankshaft bearings. I put a spare engine on my preferred bike and never went back to the original. I built a bike a couple of years ago and used the rebuilt engine, it's still the fastest 48cc I've owned so far. I actually enjoy riding the 48cc over the 66cc, I find it more fun. I can Cruise at 26-28 mph and it's a good ride.