Yamaha Superbike Challenge
Where: 2.3-mile, 21-turn course, California Speedway, Fontana.
When: Today, practice and qualifying, 8 a.m.; Yamaha West Region Dealers 100k, 2 p.m. Sunday, practice, 9 a.m.; Yamaha 100k, 3:15 p.m.
Supporting races: Today--Superstocks, 60k. Sunday--Supersport, noon, followed by 250 Grand Prix, Formula Xtreme, all 60k.
TV: 2 p.m. today, Speed Channel, re-air at 7 p.m.; 3 p.m. Sunday, Speed Channel, re-air at 5 p.m.
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