i bought a silver tzr 2 months ago. excellent bike to ride and stands out really well. top speed so far has been 72mph completely standard apart from a bigger front sproket. the acceleration is quite slow but as soon as you hit 5th gear it starts to pull ahead of other 50´s. at the moment the bike´s top end has dropped. ive had to replace a piston already! so dont exspect much realiability. after 2 months the exsust has rusted and the metal surrounding it has exspanded and looks rubbish so a new arrows exsust is on its way.