The oil light is a pressure switch not a level sensor, it won't go out untill the engine spins up enough to generate some pressure. So as an extreme example, start the engine with no oil and the light stays on, no oil pressure.
Jap bikes either have a level sensor, FZRs up to 90 something so it would sometimes flash or stay on when you hit the throttle hard. Pressure sensors are probably better as having oil in the sump doesn't mean that its being pumped round the engine which can be slightly destructive!!
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"The final measure of any rider's skill is the inverse ratio of his preferred Traveling Speed to the number of bad scars on his body." Song of the sausage creature
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