Bruce Anstey made up the disappointment of Monday's disqualification from the Supersport Junior race one by taking this morning's race two.
In addition the New Zealander set a new lap record for the race on his second circuit, clocking 125.395mph
Ian Hutchinson was second, with Ryan Farquhar making up the top three.
The Irishman also picked up a trophy for having the quickest aggregate time for the two Supersport races.
Manx Radio TT's Charlie Lambert described the Flying Kiwi's victory:
Badminton: New Manx season in jeopardy with role unfilled
Association making urgent plea to appoint league secretary
Triathlon: Winners crowned at 2026 Isle of Man Championships
Races in Ramsey were finale to latest local triathlon season
Hockey: Bacchas A win inaugural Tim Leeming Charity Shield
New pre-season event comes just ahead of new mixed campaign
Special Olympics claim big medal haul in Sweden
More than 20 successes across four sports in Malmo