The little 250 Kwacker that I rode in '73 Production TT was a belter - bog standard (in fact I had to potter round the Island, off the course, of course! to run it in) so that I had to refuel. Despite the pitstop it took me to 5th, and was a perfect match of handling to power - only thing I have ever gone truly flat out in top on through top and bottom of Barregarrow! I would love to know where that went when I had to return it to Agrati (they let me keep it for the British GP prod race at Silverstone, but it and me was a bit outclassed there by the racer-with-silencer brigade.........).