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Old July 29th, 2016, 10:48 PM   #1
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14T Front Sprocket Issues...?

Hey all,

So, my bike had been parked for the past 2 months. During that time, I installed a 14T front sprocket in anticipation of riding again.

However, now I have run into a problem that has got me puzzled. My bike is intermittently redlining at 8000RPM. I have never even once had this issue until now. I just hit 12,000 miles today. It happens right as I hit 8000RPM, usually while hard on the gas. It cuts out very abruptly, and the red light flashes. DTC is off by the way.

I've been able to reproduce it 30-40 times. Usually it's just for a second, but most recently I was able to get it to do it constantly. As I rolled on the throttle down a hill, it got to 8000RPM, and the red light stayed on, and I kept rolling on the throttle, but it stayed the same speed.


Diagnostics:
Research has pointed me to the neutral switch, clutch switch, and kickstand switch as possible issues.
-I checked the clutch switch operation and it appears to be working fine. With kickstand up and in gear, I can't start it unless the clutch is pulled in. I pulled the switch off and it looks fine, and worked correctly (via multimeter) every time I pressed it.
-I took off the neutral switch grommet and it looked fine. Nice and tight, no corrosion. When this issue happens, the neutral light is NOT illuminated.
-The kickstand switch seems to be operating correctly as well, tested via multimeter.



Has anyone else had this problem with a new front sprocket...? It makes no sense to me, because it can happen in any gear. Does the bike know what gear it's in? Did Ducati do something stupid with the rev limit tied to the gearing? I'm stumped. Pending your responses I might put my 15T back and see what happens.
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Old July 30th, 2016, 08:08 AM   #2
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There was a thread that touched on this recently - the title had something to do with rev limit. Keep us posted- I think that those of us interested in some dirt will be doing this so info will be helpful.
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Old July 30th, 2016, 08:30 AM   #3
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Wow, that's a puzzle. However, my motto is:

"Whenever something goes wrong, look at the last thing you touched."

My guess is that the sprocket change messed up the ABS.
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Old July 30th, 2016, 11:29 AM   #4
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I have had a 14t on for 1500 mi and have never had this issue; the exception being when I swapped out my clutch lever and let the switch dangle.

My guess is that it is still either the neutral switch or clutch switch (probably the clutch switch). Could try taking them completely out of the equation by making a jumper across the connector pins and see what happens. The fact that it is intermittent suggests a loose or poor connection. Possibly more apparent due to increased vibration from the 14t. Who knows..but that is where I'd continue my investigation before I put the 15t back on.


Try just pulling the switch out of the clutch perch and ziptie-ing the microswitch closed so it doesn't cycle each time you shift. Go for a ride and report back.



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Old July 30th, 2016, 12:40 PM   #5
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Ok, little update here.

I went out to a straight stretch of road where I could get through the first 4 gears to redline, and I just went back and forth.

It only happens in 2nd gear. 1st, 3rd, and 4th have no issues and can easily get to redline. I was able to repeatedly make this happen by rolling on the throttle in 2nd. As soon as it hits 8000, the red light comes on and it just stays there. If I'm accelerating quickly WFO, it will pass this 8000-8500 zone, and then begin to accelerate again afterward, causing a very jerky ride...

So that's kinda weird. I'm going to swap out the sprocket and do the experiment again, unless someone has a better idea. I tried with DTC and ABS off. No difference.


I found someone else with the exact same problem and lo and behold, they have a 14T sprocket. http://www.ducati.ms/forums/92-hyper...only-help.html

So... some of the bikes have this, and some don't...?

Last edited by kuksul08; July 30th, 2016 at 12:43 PM.
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Old July 30th, 2016, 09:38 PM   #6
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Update:

Put the 15T sprocket back on. No more issue. I rode for over an hour and it didn't happen once.

WTF!!! I can't change the gearing on mah bike? How dumb is that.
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Old July 31st, 2016, 02:08 AM   #7
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Welcome to the future Patrick. Bikes are becoming increasingly more tamper-proof thanks to all those well-meaning folk in the European parliament. The New Euro 4 regs even require diag plugs so that the police can make sure the ECU hasn't been 'hacked' when they pull you over. Our brave new Euro 4 world starts on January 1.
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Old July 31st, 2016, 11:13 AM   #8
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Quote:
Originally Posted by toeslider View Post
Welcome to the future Patrick. Bikes are becoming increasingly more tamper-proof thanks to all those well-meaning folk in the European parliament. The New Euro 4 regs even require diag plugs so that the police can make sure the ECU hasn't been 'hacked' when they pull you over. Our brave new Euro 4 world starts on January 1.
haha, new bikes all have diag plugs, that's no euro4 feature.

and, no one except factory can see and deside if a map is changed from original or not. there exist many maps for each model, from factory, so, this will be not possible for anyone except factory itself. i live in europe, and that police will check maps is bs, believe me. just for now. whats happening in some years, who knows ?
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Old July 31st, 2016, 11:49 AM   #9
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Wow! This is pretty crazy. The dealer put the 14T sprocket on mine when I picked it up new, and I've never had that issue (except when I took off the clutch switch).

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Old August 3rd, 2016, 12:34 PM   #10
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Hey Ferdi, I know bikes come with diag plugs. The difference with Euro 4 is that they are now mandatory spefically so the police can do roadside inspections. Read the regs.
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