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Old Jul 15th 2017, 09:55 AM   #11
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It also could be something as simple as needing new spark plugs.
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Old Jul 15th 2017, 09:59 AM   #12
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It's pretty hard to diagnose because the symptoms could be a wide range of problems. My money would be on it being a software over hardware issue though.
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Old Jul 15th 2017, 11:37 AM   #13
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I would assume if the O2 sensors were bad there would be a code? No? I've had tons of issues on my old 2 stroke RD 350 and changing the plugs was where I always started. The hard part is that it ran perfect,then after a fill up it starts hesitating on corner exit and at WOT it revs slower than my old 749s!! Sure it's peak HP is only 6/7 off the original dyno chart,but it seems to struggle to get there,even in 2nd gear on the freeway. That's why I've been leaning towards a plugged fuel filter or secondary injectors. Under 1/2 throttle it's still a beast,that's why the dealer has a hard time noticing my complaint when riding it I guess. It has just been super smooth and even in 6th gear I can dump it WOT and see ya!!

It's truly like night and day since that last ride. My dealers exact words " your problem isn't electronic... we need another hour to remove the tank and clean your fuel filter,since you seem convinced it's clogged or we can put injector cleaner in for you too & change spark plugs,your AFR is SPOT ON"....

To me on the 1st dyno run it looks "spot on" and it ran killer!
Now it looks super lean,then rich(thus sputter) ,then its creeping toward lean at the 4-8k rpm range,then back to "spot on"...

Also where did my awesome backfire go during upshifts!? It was like clockwork.. pow pow! Now nothing & no power.. seems starved for fuel to me..??

Last edited by JBrowny; Jul 15th 2017 at 11:41 AM.
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Old Jul 15th 2017, 05:14 PM   #14
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Fuel filter in the tank pump, can pull it apart and clean.

Psa: clean your fuel filters

Last edited by Halo2; Jul 15th 2017 at 05:19 PM.
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Old Jul 15th 2017, 11:06 PM   #15
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That's just the screen filter. It seems there is another filter built into the plastic housing of the assembly. I've seen pics but think it has to be cut out,I'm not sure.
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Old Jul 16th 2017, 01:45 AM   #16
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Originally Posted by JBrowny View Post
I would assume if the O2 sensors were bad there would be a code?
O2 sensors would not necessarily throw a code, only if it failed completely.
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Old Jul 16th 2017, 03:13 AM   #17
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Originally Posted by JBrowny View Post
That's just the screen filter. It seems there is another filter built into the plastic housing of the assembly. I've seen pics but think it has to be cut out,I'm not sure.
Ive never pulled one apart either if there is two I would doubt you would have clean screen filter but bad fuel filter, the screen is doing 99% of filtering.
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Old Jul 16th 2017, 07:11 AM   #18
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Originally Posted by Halo2 View Post
Ive never pulled one apart either if there is two I would doubt you would have clean screen filter but bad fuel filter, the screen is doing 99% of filtering.
Can anybody with experience removing internal filter comment on this? I assumed the screen was larger size,like a pre-filter? If people are having issues losing power from the fuel pump,I assumed it was fine particulates on the paper internal filter. I'm concidering buying a used pump assembly for cheap on eBay and removing,paper filter and screen,and installing the MWR mesh filter many are using. That way I know for sure it's clean and not restricting power.

I'm also goin to ask Ducati to authorize my dealer to reset my ECU to stock settings & if they can erase the learned settings too,re
-dyno,then reinstall upmap and dyno again. My dealer said "there are no updates when they searched global,and no codes" so I'm stumped.
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Old Jul 16th 2017, 09:51 AM   #19
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Oh boy. First I did an exhaustive write up on the fuel pump. Pulling the pump, modifying the pump, breaking a spare pump to show the internals. Search function people. The pump has an initial micron screen. It is removable. There is a non removable canister paper filter in the pump body. If the micron screen is not compromised then your paper filter is most likely good. I do not run the paper filters in my pumps. I have a tool I made that pulls it out. I just run the sock and a removable in line screen. If you think you have a bad/clogged pump, a simple fuel pressure test will confirm that. If you think you have compromised injectors, you can make a simple battery powered device that will hold the injector open, you can then check the spray pattern or just take them to a competent repair shop and they have a Bosch test box to look at them. You have TPS, MAP, etc all interrelated in there as well. The fact that your shop was not well versed on the pump mechanics says, find a shop that is not staffed with new MMI recruits. This shit is not difficult folks. As far as the tuning, I'm a complete idiot there and I leave that to someone here who isn't. Got a plane to catch.
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Old Jul 16th 2017, 10:02 AM   #20
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Here ya go.
Attached Thumbnails
Second opinion on Dyno results and loss of power-img_1227.jpg   Second opinion on Dyno results and loss of power-img_1262.jpg   Second opinion on Dyno results and loss of power-img_1263.jpg   Second opinion on Dyno results and loss of power-img_1403.jpg   Second opinion on Dyno results and loss of power-img_1286.jpg  

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