06 Busa

there is a sensor on the front sprocket cover check that it is still plugged in and good. if im thinking right that is your speed sensor.
 
there is a sensor on the front sprocket cover check that it is still plugged in and good. if im thinking right that is your speed sensor.
Could also remove the sensor and check that it's not physically damaged/broken, single Allen bolt, it runs close to the front sprocket, so damage is possible.
 
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