Rumblings of discontent surfaced in the Isle of Man TT paddock on Wednesday over the eligibility of Bruce Anstey's Valvoline Padgetts Honda RC213V-S.

Reports suggested questions had been raised by some team bosses and riders over whether or not the MotoGP replica could legitimately compete in Saturday's RST Superbike race.

However, TT boss Paul Phillips has confirmed that the machine meets current regulations and the rules state that 'all Superbike, Superstock and Supersport machines must be on the 2016 FIM list of homologated motorcycles'.

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Most relevantly, the regulations also determine that 'other machines may be admitted at the discretion of the Race Organisers'.

Anstey has been hugely impressive on the ?138,000 V4 racer, completing four laps in practice and setting his best speed in excess of 128mph.

The Flying Kiwi seemed to be on course for a high 129mph lap time on his flying lap on Tuesday evening, but seemed to slow off in the final sectors, leading to suggestions the 10-time TT winner is unprepared to show his hand just yet.

In addition to the exotic RC213V-S, other bespoke machines at the TT include the Suter 500cc two-stroke ridden by Ian Lougher, with Aussie David Johnson on the Norton SG5.