The combined 400cc and 125cc race, held over from last night, closed out this morning's race schedule at the Southern 100.
Alistair Howarth led from start to finish to take the 400cc win.
Dave Madsen-Mygdal battled his way up the field to take second and Peter Simpson was third.
In the Station Garage sponsored 125cc race Castletown's Chris Palmer emerged victorious; Ian Lougher then Nigel Moore the runners-up in the lightweight class.
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Castletown & Onchan face off ahead of another busy three-day schedule (Fixtures: 23-25 Apr)
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14-time winner says new teammate Rousseau 'ticks all the boxes'
Snooker: Cue Zone Blinders retain league title
Three-way tie for individual league crown after season finale
Football: Peel win Women's FA Cup to secure season double
Corkish double helps westerners beat resilient Onchan
London Marathon: "some great performances from Isle of Man runners"
Results from Sunday's event
Cycling: Cavendish to return to racing this weekend
38-year-old has had a spell out due to recent illness
