What does a VOES switch do?
The Vacuum Operated Electric Switch (V.O.E.S.) It senses high and low manifold vacuum and signals the ignition to change its advance slope. Under high load, the switch signals the ignition module to electronically retard ignition timing to reduce the possibility of detonation.
What does the voes switch do on a Harley Davidson?
This Harley VOES switch has a very important function on a Harley-Davidson. It senses vacuum behind the butterfly of the carburetor and advances or retards the ignition timing accordingly. The Harley VOES switch remains closed until vacuum is introduced. When closed, the timing is retarded.
Are there any problems with the voes switches?
The switches are mostly trouble free. The rubber hoses decay with age and the wires are susceptible to chaffing. On your scooter it mounts with the same bolt that mounts the left side of the upper engine locator strut.
How big is the v.o.e.s.switch?
All controlled by the magical V.O.E.S. switch! Available with the switch activation pre-set to operate at 4, 5 or 6” of Mercury for your calibration requirements. If your pre-Twin Cam® engine doesn’t have one, it should.
Why do I need Voes on my Evo scooter?
The EVO scooters had them because by law they had to run on 87 octane fuel. Some will tell you that an EVO run on high test has no need of a VOES. That’s not completely true. In your case it’s easy to diagnosis. Just unplug it and see if the issues go away. If it does, then test the switch with a vacuum source and a VOM.
This Harley VOES switch has a very important function on a Harley-Davidson. It senses vacuum behind the butterfly of the carburetor and advances or retards the ignition timing accordingly. The Harley VOES switch remains closed until vacuum is introduced. When closed, the timing is retarded.
The switches are mostly trouble free. The rubber hoses decay with age and the wires are susceptible to chaffing. On your scooter it mounts with the same bolt that mounts the left side of the upper engine locator strut.
All controlled by the magical V.O.E.S. switch! Available with the switch activation pre-set to operate at 4, 5 or 6” of Mercury for your calibration requirements. If your pre-Twin Cam® engine doesn’t have one, it should.
The EVO scooters had them because by law they had to run on 87 octane fuel. Some will tell you that an EVO run on high test has no need of a VOES. That’s not completely true. In your case it’s easy to diagnosis. Just unplug it and see if the issues go away. If it does, then test the switch with a vacuum source and a VOM.