Riders were left frustrated after day four of the 2011 Isle of Man TT was abandoned with only the sidecars able to get any running in.

Thursday's session was initially delayed after a road traffic accident at Ginger Hall, meaning the sidecars didn't even get underway until 7pm.

Even that led to problems as the teams of Klaus Klaffenbock and Daniel Sayle and John Holden and Andy Winkle were released prematurely and had to be stopped at Ballacraine. Seven minutes later, order was restored and the teams were on their way again.

On the first runs, Klaffenbock and Sayle were fastest through the Sulby speed trap before ultimately setting the quickest lap time, going at 113.245mph. Holden and Winkle were close behind in second with a 112.106mph lap with Conrad Harrison and Mike Aylott the only other team to break the 110mph barrier, lapping at 110.546mph.

The Honda pair of Klaffenbock and Sayle had dominated the sidecar class all week and they duly went quicker on their second run. Their 113.572mph effort was good enough to top the Thursday timesheets but they will still short of the benchmark they set on Wednesday evening.

Holden and Winkle also bettered their time on their second run and set their quickest time of the week, with their 20:06.05s lap coming at an average speed of 112.623mph. Tim Reeves and Gregory Cluze could only manage ninth but their 111.379mph run on Wednesday was still good to place them third in the overall classification.

Harrison and Aylott improved to go third on the night, and fourth overall, while Tony Elmer and Darren Marshall clocked their best time of the week to go fifth overall on the Croc a Tile Yamaha. In doing so they became only the fifth team all week to average over 110mph.

Unfortunately, that was the last running to take place after oil was dropped between Kirk Michael and Alpine. This means the solo riders have just one more session before the opening Superbike race on Saturday.