MELBOURNE, Australia - Mark Webber's a sucker for punishment on two wheels but has just enjoyed a high-risk pillion ride on a Grand Prix motorcycle.The Australian, who recently sat out part of his own outdoor adventure challenge in Tasmania because of his F1 team, Red Bull's, fear of injury, rode on a Ducati 2-Up machine at Queensland Raceway with countryman Troy Bayliss, a former MotoGP rider and triple Superbike World champion driving.'YOU'RE A TOP PILLION'"Some things need doing," Webber wrote on Twitter as he published a photo of himself and Bayless mid-wheelie.Bayliss replied: "You (Webber) were a top pillion and ripped it up solo as well."During the 2008/2009 pre-season, Webber badly broke his right leg in a mountain-biking descent but said before Christmas: "I'm not going to wrap myself in cotton wool. F1 rules my life for most of the year but I am going to go away, train and have fun doing it."Nobody is going to stop me."He also racde in the 2010 F1 seriies with a shoulder broken in another mountain-bike incident.