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.
Cycling: Bostock bound for 2026 Tour of Britain
Manxman in Great Britain squad for next month's races
Football: 2026/27 Manx season to begin this weekend
Opening fixtures of new campaign taking place tomorrow (29 Aug)
Tributes paid to Island resident and Olympic Silver medallist, Maurice Herriott
"A remarkable athlete, and a big part of our community."
Netball: Men's team selected for England competition
Eleven strong squad heading to LoughboroughÂ