Speed Restriction
In the Japanese market, 400 cc motorcycles were once restricted by top speed, but these restrictions can be removed through various means, including the fitting of an ignition "black box". The VFR400R NC30 is restricted by means of an optical sensor inside the speedometer, and a black sector attached to the indicator needle shaft. When needle swings round to 180 km/h (110 mph) the sector starts to block the sensor, ignition is cut to the front two cylinders thereby reducing power such that the motorcycle can not accelerate further.
Read more about this topic: Honda VFR400
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