Cohen Jagielski (65cc), Dex van den Broek (85cc) and Jarne Bervorts (125cc) set the pace in the morning warm up at Heerde.
McCullough was third fastest as he continues to look strong.
65cc warm up:
85cc warm up:
125cc warm up:
Warm up results: Junior World Championship – Heerde
Image: Danny Relouw
