Honda TT Legends rider John McGuinness increased the tempo even further in the superbike class during Tuesday practice on the Mountain course, lapping at a blistering 129.411mph.

The 40-year-old from Morecambe, a double winner in the Superbike and Senior races a year ago, bettered his 128mph lap from Monday to retain his position at the top of the time-sheets on the CBR1000RR Fireblade.

However, the 17-times TT winner - who holds the outright lap record at 131.578mph - was hotly pursued by Australian rider Cameron Donald on Wilson Craig's Honda, whose fastest lap was 129.023mph.

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Tyco Suzuki's Guy Martin improved significantly from Monday evening as he put the hammer down on the GSX-R1000 with an average speed of 127.542mph.

British Superbike rider Michael Rutter was fourth on the Bathams Kawasaki at 126.830mph followed by Michael Dunlop on the Hunts Motorcycles/McAdoo Honda at 126.602mph and Bruce Anstey (Padgetts Honda), who rounded out the leading six in the Superbike class at 125.974mph.

His Padgetts Honda team-mate Gary Johnson was next at 125.841mph followed by Ryan Farquhar (KMR Kawasaki) at 125.197mph.

William Dunlop on his Superstock machine was ninth fastest overall on Wilson Craig's Honda (125.189mph).

Ian Mackman was out for the first time on the new Norton V4 machine and posted a more than respectable lap of 112.36mph.

Ulster road racing stars William and Michael Dunlop and Farquhar really made their presence felt on Tuesday.

Craig Honda rider William topped the Supersport times but onlyjust from brother Michael, while Farquhar set the pace in theLightweight Supertwin class.

William - a winner in the class for the first time at the North West 200- edged out Michael, a former Supersport winner at the TT in 2009, with a best lap at 124.770mph compared to his younger brother's average speed of 124.656mph.

Anstey was third quickest at 123.488mph, with fellow Padgetts Honda rider McGuinness (122.383mph) next and the leading six completed by Donald (121.203mph) and Dan Stewart (120.037mph).

Kiwi Anstey led the times in the Superstock class with a 126.075mph lap, which put him ahead of William Dunlop (125.189mph), Manx rider Dan Kneen (124.830mph) and Johnson (122.907mph).

Adrian Archibald was sixth on the AMA Kawasaki (121.969mph) ahead of Tyco Suzuki's Conor Cummins (121.643mph), who sat out Monday's practice with an injured hand.

Ballyclare's Jamie Hamilton was again the fastest newcomer on the KMR Kawasaki at 117.447mph.

Ian Hutchinson, back at the TT after missing 2011 through injury, was 11th fastest overall on the Swan Yamaha at 123.890mph.

Farquhar leads the way on his Kawasaki ER6 in the Lightweight class at 115.398mph from James Hillier (113.190mph), Rutter (113.149mph) and Donald (112.860mph).