Years ago at Shannonville, a fella tried to roll a ZX7 through tech with a silver spray painted circle of cardboard for the rear rotor. Goofy Canuck even had the holes punched in it for authenticity. The tech director Mike Orchard had it at the riders meeting the next day and pretty much flipped his shit on the entire paddock. Mind you, this was an expert that tried this stunt, not a shervin wannabe.
