If you are getting a hard, or no start problem with a Power Commander installed you may need to have the CKP (crank position sensor) on the bike checked for its output voltage. When they get to the lower limits of their specified range (weak) they can cause errors when the Power Commander is connected. It is a very common occurrence on the older Magnetti Marelli equipped bikes. Sometimes the sensor can pick up metal particles from the crankcase, removing the sensor and cleaning it off may correct the problem. If the sensor tests out at a voltage near or at the lower limits of the specified range, the sensor should probably be replaced as it is an indication that it will soon fail completely.
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