"ACU Events Ltd wishes to pass on their deepest sympathy to Adam's family and friends," organisers said in a statement https://www.iomtt.com/news/2018/06/04/statement-on-behalf-of-acu-events-ltd.
The TT races around the island off the north-west coast of England between Britain and Ireland have been run since 1907 and rank among the most dangerous in motorsport.
Lyon's death is the second this year, after local superbike rider Dan Kneen died on Wednesday after an accident during qualifying.
Another rider, Steve Mercer, was flown to hospital following a collision with a course car attending Kneen's accident.
(Reporting by Simon Jennings in Bengaluru, editing by Ed Osmond)
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