High Quality Content by WIKIPEDIA articles! The Sabre V4 was a 500cc two-stroke motorcycle that competed in the 2001 500cc World Championship. It utilised a Yamaha YZR500 engine which was housed in a custom made frame.Sabre Sports had been offered a slot in the 250cc World Championship midway through the 1999 season, to replace the Docshop 250 team. Their performance led to the offer being extended to the 500cc class for 2000. During this year the team ran a Honda NSR500V and while they had respectable results, realised that a V4 was needed to run further up the order.