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E-VES cable causing low RPM in Axys chassis (at any mileage)
- Thread starter Murph
- Start date
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Ref pic.
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Getting that time of year-to check things out...
Holding valves open
I've had a bit of experience with the exhaust valves on the axys. I also thought that in the moment a guy could wire or zip tie the valves open. Apparently this is a dangerous idea as the stock mapping is very sensitive to air flow and rpm. With the valves manually wide open the ecu still fuels according to what it thinks the valves are doing and at most throttle positions below 6000 rpm the mixture would be dangerously lean. Or so I've been told.
I've had a bit of experience with the exhaust valves on the axys. I also thought that in the moment a guy could wire or zip tie the valves open. Apparently this is a dangerous idea as the stock mapping is very sensitive to air flow and rpm. With the valves manually wide open the ecu still fuels according to what it thinks the valves are doing and at most throttle positions below 6000 rpm the mixture would be dangerously lean. Or so I've been told.
Bringing this back to the top, my exhaust valve cable busted on me this last trip. 2016 Axys 800, has about 1900 miles on it. RPM dropped to about 7-7500rpm. Hoping my local dealer has a cable in stock. Does it have to be relearned if its a new cable? There is no adjustment in the cable so I am not sure what the relearn will do. Maybe it just verifies the servo hits the 3 positions.
According to service manual, re-learn is required with cable replacement.
In practice, I have found that a code will be thrown about 30% of the time with cable replacement-- I've replaced about 15 cables between mine and customers.
I keep a spare cable in the shop.
Ya none of my dealers have the cable in stock so I had to order it. I'll try just replacing it and if it throws a code then I will get the relearn done. Mine pulled out of the crimped end where the t plate is on the valves like most of the other failures.
Indeed it sure does- and always have spare hangin in th shop also Murph- Generalyy I have seen also you can get away with it for a few rides then..you throw a code.
I must have a unique sled. I have not needed a relearn for any E-VES cable change. The whole E-VES system, except the actuator, got changed when I installed a BMP 860, which require the valves to be cut to fit the larger bore . I had the original valves and cable stashed for when I had to put the 800 back in, which I did last season when installing a BD Sidekick Switch. I did replace the original cable with a new one, no relearn done and no codes thrown. This maybe due to my cable not being stretched beyond service requirements or breaking a cable. FWIW, I have swapped out every item on the list in the service manual that suppose to require a E-VES relearn except for the E-VES actuator.
FYI, I replaced the cable with a new one, took the valves apart and cleaned them while I had it apart. Re-assembled the parts and it ran like a champ, no check engine light. I did not take it to the dealer to do a relearn so hopefully it will stay that way.
I'll answer my own question. The cable was broken. I can only guess that the actuator was cycling because the rpm was surging, putting it above and below the rpm actuation point.
5000 km (3000 mi)
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