Hunting and High idle permanent fix! - TRIAL

Graeme Mitchell

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Last few rides this week the hunting consistently comes in after about 8mls ( first stop at lights) All I then do is turn off the ignition count to 10 then start up again with the tick over returning to 1200. This strongly suggests to me the hunting is not caused by leaks but ECU/sensors not managing things properly. BTW if I ever so slightly add a bit of throttle I can keep revs constant at say 1800 whilst in neutral.
 
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Last few rides this week the hunting consistently comes in after about 8mls ( first stop at lights) All I then do is turn off the ignition count to 10 then start up again with the tick over returning to 1200. This strongly suggests to me the hunting is not caused by leaks but ECU/sensors not managing things properly. BTW if I ever so slightly add a bit of throttle I can keep revs constant at say 1800 whilst in neutral.
If you have covered leaks,cleaning out the intake port, filters clean then the issue might be power going the idle air control valve. We found that at idle the charging system along with the SCS ECU was not providing enough to full/smoothly operate the IACV. The easy test is to have a full charged and full CCA battery on a cold bike. (We found the a lithium held better voltage at startup as well.) Leave headlamp off, turn key, switch to run, let fuel pump cycle and then start. Idle should raise then should mellow as the valve does its thing. Look at voltage during start up. How much does it drop?

Check wires at ecu, Dielectric grease is your friend, and check the pins for the IACV to make sure they are full seated as we have found loose/ poor connections.

If you think the valve is suspect you can pull the valve and cycle to see the solenoid raise and lower the valve.

The IACV valve is the last thing to worry about and electrically checking it is super easy to confirm operation.

Unlocking the ECU is helpful in locating these issues as well.
 

Graeme Mitchell

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Feb 3, 2020
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If you have covered leaks,cleaning out the intake port, filters clean then the issue might be power going the idle air control valve. We found that at idle the charging system along with the SCS ECU was not providing enough to full/smoothly operate the IACV. The easy test is to have a full charged and full CCA battery on a cold bike. (We found the a lithium held better voltage at startup as well.) Leave headlamp off, turn key, switch to run, let fuel pump cycle and then start. Idle should raise then should mellow as the valve does its thing. Look at voltage during start up. How much does it drop?

Check wires at ecu, Dielectric grease is your friend, and check the pins for the IACV to make sure they are full seated as we have found loose/ poor connections.

If you think the valve is suspect you can pull the valve and cycle to see the solenoid raise and lower the valve.

The IACV valve is the last thing to worry about and electrically checking it is super easy to confirm operation.

Unlocking the ECU is helpful in locating these issues as well.
Hi
Gone through suggestions but nothing obvious. When I first start with a fully charged battery and cold engine the revs are holding constant about 1500revs. Not sure what to look for in voltage drop as the reading says 12.7 volts before turning ignition then increases to plus 13 volts when running
 
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Have you cleaned out the IAM and Cap ? Might be some debris or other gunk in there restricting its closing . So when you start the bike , do the revs climb up to 1800-2000 or so then settle back to 1500 rpm ? When you go for a ride are you still getting the hunting revs , or is this now gone and you get a constant high idle 1500 rpm ? This has to be solveable because there are too many OMEX Euro 3 that work . Have you considered trying this :

https://www.accessnorton.com/proxy.php?image=https%3A%2F%2Fi.vgy.me%2FmKN6AG.jpg&hash=574b928ca078b1b1be4854e12353c3c5
 
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Graeme Mitchell

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Have you cleaned out the IAM and Cap ? Might be some debris or other gunk in there restricting its closing . So when you start the bike , do the revs climb up to 1800-2000 or so then settle back to 1500 rpm ? When you go for a ride are you still getting the hunting revs , or is this now gone and you get a constant high idle 1500 rpm ? This has to be solveable because there are too many OMEX Euro 3 that work . Have you considered trying this :

https://www.accessnorton.com/proxy.php?image=https%3A%2F%2Fi.vgy.me%2FmKN6AG.jpg&hash=574b928ca078b1b1be4854e12353c3c5
No, but will give them a clean.

Revs are only 1500 constant when starting from cold. Starting from warm they generally hold at 1200-1300 for a while until the hunting starts between say 1400 and 1800 which is most noticeable when stopped and in neutral. It sounds like I am deliberately giving it a bit of throttle so get some looks every now and then - not that bothers me!
 
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