Here are some dyno readouts for a few MiniMotos.

The blue line is a MK1 MM with a sleeper kit, a PBU filter and a cheap exhaust from eBay.
The pink line is the same bike with a rocket key fitted.
The green line is another MK1 MM with a headstrong kit, a PBU Power Pipe and filter fitted.
The red line is a standard Blata Elite.  They used to pass these off as having 4.2hp!