Bike Anti-Porn - When Things Go Wrong

@Cheesecake_intl had an ancient one of those on the first or second Tweed run. Remember him firing it up and ragging a quick lap of a square. Motor was tiny and mounted above the rear wheel.
I'd love a go on one fitted to a half decent 90s mtb with slicks..

They are interesting bikes - the legal status changes as soon as you fire the engine, once running (even if not producing drive) you have to have the appropriate VED paid, an MOT, registration plate and an approved helmet, plus insurance etc.

Turn the engine off and all of these requirements vanish.