Solo engines are actually really powerful. It was surprisingly zippy and had a lot of potential to go faster with a bit of porting and a bigger carb. Stock is a tiny 10mm bing and the smallest of reeds. It was still able to keep up with mild kitted puchs and was stomping other modified stockers on moped Monday rides. It doesn’t take much abuse to trash the forks, shocks and wheels. The driven pulley is also a bit weak, mine wallowed out the bearing journals in the plastic, but other than that they are solid bikes