interesting observation (servo/exhaust valve) - Page 2 - Ducati Monster Forums: Ducati Monster Motorcycle Forum
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post #11 of 39 (permalink) Old 03-27-2013, 07:28 PM
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Quote:
Originally Posted by chris h. View Post
Disconnecting just the cable will not throw the CEL. I've had mine disconnected for approximately 1500 miles. No light. Disconnecting the electrical harness however, results in immediate CEL.
Just to clarify, . . . are you disconnecting it at the motor, or at the mid-pipe ? Or does it not matter ?

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post #12 of 39 (permalink) Old 03-27-2013, 07:38 PM
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At the pipe. I believe I just removed the little black cover then took the swedge out.
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post #13 of 39 (permalink) Old 03-28-2013, 01:46 AM
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Glad I reflashed my ECU, took that crap off my bike and threw it in the ever growing pile of factory parts

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post #14 of 39 (permalink) Old 03-28-2013, 07:21 AM
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Originally Posted by ghettogarage View Post
Wow what a difference. Not only is that hesitation gone but the bike sounds so much better cruzing around (part throttle).
I noticed the same thing after I removed my valve; the bike seemed to sound much better at low RPM with the stock exhaust. Then I was informed by other members here (or on the DMF) that the exhaust valve is only closed when the bike is first started and at idle in neutral, and after that it remains open, so I figured I must have been imagining the improved sound.

**EDIT: I can't say I noticed any change in hesitation (or lack thereof), but I wasn't really looking for one

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Last edited by Bishamon; 03-28-2013 at 07:24 AM.
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post #15 of 39 (permalink) Old 03-30-2013, 02:11 AM
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Hello Guys

Just a quick couple of questions.

Can someone explain to me the purpose of the In Line Exhaust Valve?
And what does CEL stand for? What is it? Something displayed on your dash?

I have this high pitched sound coming from my bike at 5000RPM, like a vibration or harmonics of the bike. At 5000RPM the valve would be 100% open right? Im thinking of detaching the cable to the valve as part of trouble shooting. Are there any long term issues with having this cable detached? Bike run leaner?

I think that might have been more than a couple of questions.
Sorry guys, new to ducati and all these extra moving parts.

Thanks in advance guys
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post #16 of 39 (permalink) Old 03-30-2013, 02:25 AM
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Originally Posted by Altra001 View Post
Hello Guys

Just a quick couple of questions.

Can someone explain to me the purpose of the In Line Exhaust Valve?
And what does CEL stand for? What is it? Something displayed on your dash?

I have this high pitched sound coming from my bike at 5000RPM, like a vibration or harmonics of the bike. At 5000RPM the valve would be 100% open right? Im thinking of detaching the cable to the valve as part of trouble shooting. Are there any long term issues with having this cable detached? Bike run leaner?

I think that might have been more than a couple of questions.
Sorry guys, new to ducati and all these extra moving parts.

Thanks in advance guys
Well the exhaust valve is for sound and emissions I believe, don't really need it. I recommend either getting your ECU reflashed or get a ducEE http://www.vizi-tec.com/duc-ee/

By doing this you can remove the cable and servo motor all together plus bike runs better. Oh and CEL is just an acronym for Check Engine Light

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post #17 of 39 (permalink) Old 03-30-2013, 03:11 AM
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Quote:
Originally Posted by Flaboi796 View Post
Well the exhaust valve is for sound and emissions I believe, don't really need it. I recommend either getting your ECU reflashed or get a ducEE http://www.vizi-tec.com/duc-ee/

By doing this you can remove the cable and servo motor all together plus bike runs better. Oh and CEL is just an acronym for Check Engine Light
Excellent thanks mate. Greatly appreciated

I have been doing more reading up on the exhaust valve and alike, as the dealer believes the noise coming from my bike at 5000RPM is valve related. Trying to understand this valve more I have come to learn that all Monsters come LEAN out of the factory, that's why we hear popping on deceleration with stock pipes. I have since replaced mine with Arkrapovic slip-ons and have been informed that I don't require an ECU remap. Not sure this is true as I now have more popping on deceleration (love it tho).

Im thinking of disconnecting the Exhaust Valve Cable for testing purposes (Generate CEL). This will apply slight back pressure to assist with LEAN air/fuel mixtures. Well that's my though process, as like stated before at 5000RPM my bike makes a high pitched noise. I wonder if the bike is running to LEAN.

Lets say leaving the Exhaust Valve closed (disconnected), would this cause any issues? Overheating? Poor performance? etc.....
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post #18 of 39 (permalink) Old 03-30-2013, 03:33 AM
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These bikes come very lean from the factory to meet emissions requirements. Although you don't "need" to reflash your ECU with slipons it will make it run MUCH better. http://motowheels.com/i-7185267-mw-t...ecu-remap.html

Disconnecting the exhaust valve will give you the EXVL error code and then its a pain in the butt to get it to clear... at least it was for me. sensitive setup

The exhaust valve stays in the open position when the cable is disconnected. So no problems, better airflow... actually if you can get your hands on a 696 midpipe that would be ideal (no exhaust valve) but those are hard to find used/cheap

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post #19 of 39 (permalink) Old 03-30-2013, 03:58 AM
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Quote:
Originally Posted by Flaboi796 View Post
These bikes come very lean from the factory to meet emissions requirements. Although you don't "need" to reflash your ECU with slipons it will make it run MUCH better. http://motowheels.com/i-7185267-mw-t...ecu-remap.html

Disconnecting the exhaust valve will give you the EXVL error code and then its a pain in the butt to get it to clear... at least it was for me. sensitive setup

The exhaust valve stays in the open position when the cable is disconnected. So no problems, better airflow... actually if you can get your hands on a 696 midpipe that would be ideal (no exhaust valve) but those are hard to find used/cheap
Thanks mate.

This is all getting confusing now :P

Other forums talk about the valve being closed at start to assist with cold starts and noise levels. Waiting for a response I decided to roll the bike out and observe the valve. On start it would check the valve, open - close or close - open. So I wanted to see what it would do if I disconnected the cable from the valve, the cable just moved up and down as expected and the CEL went off as per normal. So I started the bike and all worked as expected.
No EXVL errors or CEL errors. I am riding a Monster 796 2012, so I don't know if anything has changed.

I might take it for a quick run to see how she performs.

Question tho, if the valve is open to start with, why would it close it to restricted air flow above 4000RPM?

Cheers
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post #20 of 39 (permalink) Old 03-30-2013, 04:19 AM
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Originally Posted by Altra001 View Post
Thanks mate.

This is all getting confusing now :P

Other forums talk about the valve being closed at start to assist with cold starts and noise levels. Waiting for a response I decided to roll the bike out and observe the valve. On start it would check the valve, open - close or close - open. So I wanted to see what it would do if I disconnected the cable from the valve, the cable just moved up and down as expected and the CEL went off as per normal. So I started the bike and all worked as expected.
No EXVL errors or CEL errors. I am riding a Monster 796 2012, so I don't know if anything has changed.

I might take it for a quick run to see how she performs.

Question tho, if the valve is open to start with, why would it close it to restricted air flow above 4000RPM?

Cheers
The exhaust valve cycles (open-close-open) when turned on. it's checking to make sure the servo motor is working properly but the valve is only really used between 4000 - 7000 rpm roughly...it closes to make the bike pass noise restriction requirements.

Removing the cable by itself shouldn't give you the CEL, its when you disconnect the servo motor wire harness. Your bike doesn't know if the cable is connected or not, it's just testing the motor at start up

'13 Ducati Monster 796 ABS (CURRENT)
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