It had been more than a decade since Coppins raced Supercross at the Tokoroa track and Purvis' bike wasn't set up for the heavier, 40-year-old, Coppins.
But with a quick switch of suspension parts, replacing Purvis' shock with a stock one from the parts box, and a couple of pairs of borrowed goggles Coppins was good to go.
Coppins then proceeded to clean sweep all three SX2 (250cc) class races, twice finishing ahead of Tauranga's Micah McGoldrick - the man who had finished first-equal in the class last season - and beating Hawke's Bay cross-country ace Reece Lister to the chequered flag in the final race.
The phrase 'clean sweep' was only appropriate in terms of the results, however, because the racing was anything but clean, with persistent showers drenching the track and turning it into a muddy mess.
But Coppins' many years of international experience came to the fore and he now heads to the second and final round of the national series near Winton this coming Saturday with a 15-point lead over Lister in the championship chase.
Honda's McGoldrick crashed out of the day's final SX2 race at Tokoroa, although he's still third-equal in the standings, sharing the final podium spot with Nelson Yamaha rider Clayton Roeske.
"My riding these days is more in a test-rider capacity, so I didn't find this easy," Coppins said.
"I struggled with rhythm, flow and the intensity of racing. I had promised the Supercross organisers that we'd enter a rider in each class and I didn't want to let them down. I will ride the bike at Winton this coming weekend too because I want to support Jim Cooper, the track owner there.
"It's a real bonus to be able to turn up there with the championship lead too."
Meanwhile, in the SX1 (450cc) class, Lamont battled the difficult conditions and national MX1 champion Cody Cooper throughout the rain-lashed afternoon, eventually settling for overall runner-up spot.
Mount Maunganui's Cooper (Honda) leads the SX1 class by nine points from Lamont, with Tauranga's Roydon White (Kawasaki) third overall, eight points further back.