I just got my 48cc 2008 engine kit 2 days ago. Finally got to ride it today. Kinda low on power, maybe the rings are backwards? I'm going to want a bigger rear sprocket to climb all these dang hills in Sedona. Flat and level it cruises at 25 or so easy. Get's wimpy on even small hills. I was a machinist for 25 years back east and I would not ever make parts as ugly as in this kit. I was kinda surprised it even made 1 block, the way it's made. Well, I guess I'll see how long it lasts! I was riding an Electric-Rider E-bike, but it was expensive, powerless, and the batteries were real heavy. Anyone want to buy an e-bike kit?