The youngster blitzed the 85cc/150cc 12 to under-16 years division in round two with three straight wins from Mat Fabry and Mitchell Outram.
Also doing the northern suburbs proud was Regan Duffy who placed first in the 65cc seven to under-12 ahead of Corben Weinert and Christian Silvestro and Jake Harvey who won all three 50cc auto seven to nine years races, followed by West Reid and Seann Arrowsmith.
Connor Tierney gave a standout performance in the 250cc 15 years class with Stuart Eardley-Wilmot a close second and Baylee Webb third, and followed it up with another win in the 100cc-125cc 13 to under-16 years, followed by Grothues and Tom West.
West went on to come second in the 250cc 13 to under-15 years.
The round also included the 50cc auto demo class with riders over 4 years showing off their motocross skills on a shorter track.