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Bikes: 748S, HM1100S, V4SP, Was: DD-A #111
Posts: 13,086
Join Date: Feb 2002
Location: Back in Essex
Mood: Passion Killer
Certainly doesn't sound right - I know of one other guy (in the Essex DSC, funnily enough!) that had a replacement ECU supplied second hand which was supposed to be from a 748.
He had exactly the same symptoms as you, and it turned out that the ECU had a 916 chip in it rather than the 748 one.