Here is my Partner-powered scooter.
It has 49cc engine and 2hp on the wheel.
Dual chain drive of course and NO brakes! Weight is 18kg.
I calculated the top speed to be 34km/h/8000 rpm but it rev`s over 10000rpm thanks to my
engine tuning. Wheels are from aeroplanes tail and they are pneumatic of course.
Chassis is home-made as you can see.
It`s great that i found your website and found out that i`m not the only DIY engineer on earth! ;)