The final practice session at the 2012 Isle of Man TT races was brought to a premature end due to an oil spill on the Barregarrow section of the circuit.
A number of leading riders were left bitterly disappointed after missing the chance for one final outing on their superbike machines ahead of Saturday's opening race, which is scheduled for an 11am start over six laps.
Honda TT Legends star John McGuinness ended practice week at the top of the times on his Fireblade after lapping at 130.079mph on Wednesday.
The 17-times winner starts as the hot favourite in Saturday's Superbike TT race, but faces stiff opposition from fellow Honda men Bruce Anstey and Cameron Donald, who each breached the 129mph barrier.
Gary Johnson and Michael Dunlop will also be targeting podium success, while Tyco Suzuki's Guy Martin is desperate to achieve his maiden triumph on the Mountain course.
Martin managed a lap at 128mph and last year's Senior race runner-up is expected to be right in contention on race day.
His Tyco Suzuki team-mate, Conor Cummins, faces an uphill battle after suffering a hand injury in a crash at the North West 200 last month.
Cummins said: “It's hard to explain how the hand feels. It's not typically painful but just constantly throbs and I don't want to be taking any painkillers or injections – it's too dangerous around here to be doing that as you have to know how tight you're holding on.
“We'll just work around it and do the best we can. It's just a matter of gritting my teeth and getting on with the job.”
McGuinness's Honda TT Legends team-mate, Simon Andrews, plus James Hillier on the Bournemouth Pr1mo Kawasaki have impressed with their pace during practice week and are dark horses for a top six finish in the first race of this year's festival.
William Dunlop remained fastest in the Supersport class, completing a lap at 124.895mph, again finishing ahead of brother Michael on his Yamaha R6, whose average speed was 124.175mph.
James Hillier was the top rider in the Lightweight Supertwin class at 114.872mph ahead of race favourite Ryan Farquhar at 114.174mph and his KMR Kawasaki team-mate Michael Rutter (112.796mph).
Gary Bryan and Jamie Winn set the pace in the Sidecar session at 112.331mph from Dave Molyneux and Patrick Farrance (109.799mph), who remain fastest overall ahead of Saturday's first race.