However, with his tyres fast losing their edge on the slick, hard-packed Pukekohe dirt, Cooper succumbed to pressure from Gibbs and was forced to accept the runner-up spot in race three.
The end result for the weekend is that Cooper is still on top, three points clear of Gibbs, as the competitors head to Taupo for the fourth and final round on March 10.
"I felt good in the last race and put myself in a good position, but I guess I should have put some fresh rubber on the bike. I'm gutted actually. The tyre was good for the first two races, but I should have put a new rear tyre on before that last race," Cooper said.
"Hey, I'm having little problems like this and I'm still leading the series, so I'm happy about that.
"I'm just looking forward to having no problems and getting a clean sweep. I'm looking forward to Taupō.
Meanwhile, West Auckland's Hamish Harwood leads the MX2 (250cc) class from Mangakino's Maximus Purvis and Australian Wilson Todd. Dual class rider Harwood also leads the 125cc class standings after round three at Pukekohe.
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