CB1100 Idle speed instability problem

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Exactly, when the desired rpm is achieved ( warmed up ) shut the key off, the iacv will remain in that position until the key is turned on ( because you disconnected the power from the e.c.u. ) and the iacv etc. initiates the bike with a new position.

So to be clear; 1100 rpm, shut the KEY off and disconnect the iacv, done.