Foggy Petronas Racing riders Troy Corser and Chris Walker both expressed dissatisfaction with their grid positions for Sunday's races at the ninth round of the Superbike World Championship at Assen, the Netherlands.

Troy will start from the third row after qualifying in ninth while Chris was 14th fastest in a Superpole session dominated by pacesetter Frankie Chili, who produced the quickest lap of the weekend of 2mins 03.103secs to claim pole position.

Troy went into the one-lap shoot-out having just recorded his own best time of 2mins 04.570secs in the afternoon free practice session. However, a problem with his preferred bike at the end of that session forced him to switch to the spare bike for his Superpole lap of 2mins 04.831secs.

"I should have at least been on the second row," claimed Corser. "There is not too much difference between bikes but the clutch was slipping differently and the geometry was shorter in the front on the other bike to make it steer better. I knew I could do a 2mins 04secs on the number two bike but I thought I could have gone under 2mins 04secs on the other. But that bike had started to make a funny sound after I had done my fastest lap and our chief engineer Steve Thompson decided we could not risk it for Superpole.

"I am just going to have to push 100 per cent on every corner of every lap tomorrow. Everyone is in the same boat with the tyres spinning and sliding but maybe we are struggling more because we have to try and carry that much more corner speed as we are still a little down on power."

Chris, who has been receiving treatment for a bad cold, opted to use a race tyre for Superpole but was unable to match his best time of 2mins 05.395secs.

"I have struggled to be as quick on the second half of the lap - the fast part of the circuit - on qualifiers as I have on race tyres," said Walker. "So for Superpole we decided to use the race tyre that I used for my fastest lap in the morning. Unfortunately, maybe because the track temperature was so much hotter in the afternoon, it didn't seem to work. So we now have a mountain to climb, especially as there is a long drag to the first corner off the grid.

"But we have made progress today as we are now consistently going 0.8 of a second faster on race tyres than yesterday. We have got the front to work a little better, which gave us more grip going into the corners as the rear wheel wasn't lifting off the ground."