After warming up for a few minutes at a nice steady idle, the idle speed surges up and down. It seems as if it wants to drop down to a warm idle speed, but then jumps up, and continues the cycle. Fault code P0505.
Is it the IACV?
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Surging is usually at the throttles and idle air control motor. Cleaning them usually takes care of this problem. I haven't worked on bikes since the 80's. Surging back then was always dirty carbs. I am assuming that the new bikes are fuel injected and have an IAC motor.
it is possible that it will be the cause of the problem. Clean the terminal and the connected wires by placing them in a container of hot solution of carbonated soda ( baking powder). This will neutralize the sulphuric acid corrosion. Was with clean water when reaction has stopped. Cover terminals with vaseliene ( CRC terminal spray wax is best) make sure all connections are tight.
Also have the fault codes read to check for ather sensor problems.
sounds like the idle air control sensor is bad or it could be the idle speed control sensor(module) both can be found on the throttlebody. but to be sure you can take the car to auto-zone and they will run a free diagnostic even if you dont have a check engine light there still may be a code stored.