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Tires are old, tires are new, clutch slipped, clutch is too grabby, clutch springs are shot, couldn't keep front wheel on the ground, not enough traction, water on the track, missed (fill in blank) gear, engine bogged, too much gas in tank, bad gas in the tank, too much humidity in the air, camera flashes distracted me, fell asleep at the lights, locusts, snow, earth quake arrghhh!!!
That's all I can think of for now. I'll get some more tonight