Manxman John Crellin lost his life in Friday's Senior TT.
Mr Crellin, who was 55 and a privateer, died in an accident at the Mountain Box on the fifth lap.
It happened just hours after he secured a podium position in the TTXGP.
Organisers have released few details about the incident, but it's undertstood no other machine was involved.
Mr Crellin had competed in the TT for many years, achieving numerous finishes within the top 30.
His passion for motorcycles had seen him take part in the historic TTXGP race around the mountain course on Friday morning, where he won third place in the open class.
In the early 80s Mr Crellin had 'top ten' placings in the Manx Grand Prix
Mr Crellin was also a keen mountaineer and set himself the challenge of climbing the highest peak in each of the seven continents.
Only last month he tried for the third and final time to reach the summit of Everest, a goal which eluded him.
Mr Crellin was a civil engineer, employed by the Manx government's Department of Transport, and lived in Douglas.