But Kennaugh timed his third start of the race perfectly, pulled out a lead of almost half a second on that lap, and held on to win. Steve Brogan won a battle over the line to take third place on the HM Plant Honda from James Westmoreland (Centurion Honda) and BJ Toal (Virgin Media Yamaha).
"That was a testament to the team and the improvements they've made to the engine since
Oulton Park," Kennaugh said.
The outcome leaves Richards leading the championship with 65 points, but Kennaugh on 58 and Brogan on 52 are making it a three-way battle between manufacturers.
Sunday pm - Byrne Beats off the Young Guns Again
Shane Byrne and the loping power of his Airwaves Ducati 1098R again broke the challenge of British superbike racing's young guns in the first of today's two 20-lap races on the 2.3-mile grand prix circuit.
The rock-hard Cal Crutchlow ignored his dislocated right ankle to grab the lead on his HM Plant Honda from Tom Sykes, who had been hot in practice on his Rizla Suzuki. Byrne was in pole position, but made another of his trademark lukewarm starts this season to finish the first lap in sixth place.
At Oulton Park last week Byrne charged from 13th place to first in one of the races. Could he perform a similar feat here?
Within four laps he was sitting behind Crutchlow and Sykes, comfortably watching their moves. On lap 13 Byrne got Sykes, and soon after he eased inside Crutchlow on the Surtees right-hander to take the lead. The move sent Crutchlow wide, and Sykes moved into second.
Byrne won his fourth race of the year by 1.907 seconds from Sykes, with Crutchlow 3.1 seconds behind the leader.
"Once I got into third place it was going to be alright," Byrne said. "Tom made a bit of a mistake and I got past. Then I nearly ran off the track, but they gave me a bike that was good for the whole race."
Crutchlow said: "Leading for 16 laps was hard when you've got a dislocated ankle. Now I'm going straight to the ice bucket to get the swelling down."
