Chase passed six riders within just two or three corners and was on the charge for the leaders.
"When a rider ahead of me made a mistake and Tyler Steiner (14 to 16 years' 250cc four-stroke class winner) hesitated, I was able to push through to second, with about two laps to go, and I set about catching the race leader, Trent Collins."
Even though Chase was 10 seconds adrift of Cambridge's Collins, that gap soon disappeared and Chase closed to within a metre of Collins' rear wheel with just over a lap to complete.
"I took the lead and pushed hard, eventually winning the race by about six seconds."
Chase followed through to also win the senior 125cc class the following day, registering 2-1-1 results to head off Dairy Flat's Claude Griffith and Ngatea's Ben Broad.
Chase will enter the senior motocross nationals in in February, as one of the favourites.