Mat Mladin and Tommy Hayden have both been thrown out of the first AMA Superbike qualifying session at Road Atlanta because, says the AMA, their cranks were illegal.

However, their Rockstar Suzuki team-mate Ben Spies, is still on pole and his engine was found to be legal.

A statement from AMA Pro Racing said: "All of the qualifying lap times for #6 Mat Mladin and #22 Tommy Hayden were disallowed from the Friday Group A Superbike qualifying session at Road Atlanta for use of non-homologated crankshafts.

"Both riders will have the opportunity to participate and post lap times during the Saturday morning qualifying session."
Friday qualifying results:
1    1    1:23.649    109.744    Ben Spies    Suzuki GSX-R1000        1:23.649   
2    40    1:25.201    107.745    Jason DiSalvo    Yamaha YZF-R1        1:25.201   
3    20    1:25.226    107.714    Aaron W. Yates    Suzuki GSX-R1000        1:25.226   
4    32    1:25.333    107.579    Eric Bostrom    Yamaha YZF-R1        1:25.333   
5    95    1:25.392    107.505    Roger Hayden    Kawasaki ZX-10R        1:25.392   
6    2    1:25.458    107.421    Jamie A. Hacking    Kawasaki ZX-10R        1:25.458   
7    17    1:25.652    107.178    Miguel DuHamel    Honda CBR1000RR        1:25.652   
8    100    1:26.045    106.688    Neil Hodgson    Honda CBR1000RR        1:26.045   
9    99    1:26.570    106.041    Geoff May    Suzuki GSX-R1000        1:26.570   
10    50    1:26.729    105.847    Matt D. Lynn    Honda CBR1000RR        1:26.729   
11    907    1:27.218    105.254    Ben Thompson    Suzuki GSX-R1000        1:27.218   
12    464    1:27.644    104.742    Joshua Day    Yamaha YZF-R1        1:27.644