09-12-2021, 10:24 AM
Hi Gordo, this valve regulates the air which bypasses the four butterfly vaves from the throttle.
It is the modern replacement of the idle adjustment screw on normal carburettors and normally works very well as you know.
What you describe is the classic situation in which it fails, my guess is that the permanent magnets inside the stepper motor lose their magnetism because of the heat and thereby the ability to operate as before.
There is also a flaw in the duty cycle ( i think ) of the software inside the ecu that does not appear in other models, the 2014 models seem to be affected the most with this situation as you probably have worked out.
Look out for some info towards the end of the thread, there is a more convenient way to replace the iacv.
Nobody has found a difference between the old and replacement iacv, not drag or anything else hence my theory of the weakened permanent magnets due to heat.
This valve operates regularly when the bike is moving, not just when it is idling.
As a positive point no iacv replacement has had any more problems
It is the modern replacement of the idle adjustment screw on normal carburettors and normally works very well as you know.
What you describe is the classic situation in which it fails, my guess is that the permanent magnets inside the stepper motor lose their magnetism because of the heat and thereby the ability to operate as before.
There is also a flaw in the duty cycle ( i think ) of the software inside the ecu that does not appear in other models, the 2014 models seem to be affected the most with this situation as you probably have worked out.
Look out for some info towards the end of the thread, there is a more convenient way to replace the iacv.
Nobody has found a difference between the old and replacement iacv, not drag or anything else hence my theory of the weakened permanent magnets due to heat.
This valve operates regularly when the bike is moving, not just when it is idling.
As a positive point no iacv replacement has had any more problems