European project

On holiday in Texas and wandering round an off road dealer spotted this XR650 Honda, the engine unit looks small and compact ... Hmmm could you squeeze it in a Minimono?
I fancy having a go and at these prices its hard to say no! Brand new complete machines £2600.
One of the guys in the shop races one and reckons 70 BHP is no problem, and they do 1000 mile races off road too.
I wonder how much weight I can get through hand lugage?