VALENCIA (AFP) - The memory of Marco Simoncelli will hang heavy on the season-ending Valencia MotoGP on Sunday. The young Honda rider's death in a horror crash at the Malaysian GP has cast a pall of gloom on the sport as the curtain falls on the campaign. Under normal circumstances - and with the MotoGP title already claimed by Casey Stoner - another Italian, Loris Capirossi, could have hoped to have been the focus of attention as the veteran will retire after the race following 22 years of World Championship action. Former 250cc world champion Capirossi will make his 328th and final Grand Prix start and the Pramac Racing rider says he and his fellow racers are determined to pay a fitting tribute to Simoncelli. "It will be difficult to be in the paddock without Marco, as everyone will miss him.