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Old Jul 14th 2017, 07:01 AM   #1
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Second opinion on Dyno results and loss of power

So took my bike in about 2 weeks ago for hesitation around 5k rpm & loss of power @ full throttle at any rpm. It all started after a full up . I ran a whole tank and another 1/2 through to get the suspected bad gas out. Same issue.. I can give full throttle on the freeway and it bogs down compared to before. Still Reba all the way up,but above 50% throttle it's slow to rev.

I suspect the internal filter inside the fuel pump houseing to be plugged,and or a plugged or faulty injectors. The dealer wants more $ to diagnose yet says " air fuel is perfect and can't replicate issue".

I have a 2016 1299s w full akro and upmap w 3000k miles
It has been FLAWLESS and a thing of beauty until 2 weeks ago.
They also checked the carbon canister and no raw fuel.

The map (air fuel line) was perfect after the system and upmap,now it's super lean,then rick,them leaner than before.
Also it used to backfire on all upshifts w quick shifter until this started,now it does not at all..

I see the huge flat spot from about 5-8k rpm and seems to to be down on power from 1st dyno.. also latest dyno less peal power and torque curve erratic?
Help/advice??

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Old Jul 14th 2017, 04:55 PM   #2
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Safety wire the exhaust flapper valve open. It might be closing on the throttle.
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Old Jul 14th 2017, 05:18 PM   #3
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Originally Posted by Twistedracer View Post
Safety wire the exhaust flapper valve open. It might be closing on the throttle.
He has the full Akra. No flapper.
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Old Jul 14th 2017, 05:20 PM   #4
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Were the pulls done on the same dyno?
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Old Jul 14th 2017, 09:55 PM   #5
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it's easy to pull out the fuel pump and examine the filter, you mind as well change it and the mesh cover while you're at it - I've been told the quality of those parts are terrible
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Old Jul 15th 2017, 03:04 AM   #6
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Yes same dyno,but a year apart and it seems they changed software so it's formatted differently and hard to compare.

From what I've heard read I can remove the fuel pump assembly,but can't remove the "inside" fuel filter. Since I have no codes the dealer wanted to charge me to "clean my fuel filter since I was concerned" but after I had to argue with them for 1/2 hour,they finally looked into it and told me "it's not serviceable,but we can inspect it and estimate for replacement"..
It's $1200 and I'd have no way to prove it's clogged for warranty to cover it. So I may just take it out and see if I can remove the inside filter all together and install the MWR sock filter.

It's killin me because my bike ran perfect,then it didn't. The dealer wants me to pay to change the spark plugs and run some fuel cleaner. Both carry no warranty so I'll have to do those myself as well..

Then I'll have to change/clean the fuel injectors myself too if still no luck because I can't prove/test those are faulty for warranty to cover @ $366 each..

Not sure if I'm even going in the right direction??

Last edited by JBrowny; Jul 15th 2017 at 03:12 AM.
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Old Jul 15th 2017, 04:02 AM   #7
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fuelling system lost the correction map?
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Old Jul 15th 2017, 04:10 AM   #8
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A real tune (not the generic up-map) would be half the cost of messing with the spark plugs, fuel filter, etc. I'd start there and put it back on the dyno. You mentioned the AFR being way off but they look well within range to me.
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Old Jul 15th 2017, 06:46 AM   #9
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I def plan to go RB or TB,but after warranty. I really feel this is somehow mechanical since it ran flawlessly for 2500 miles and has no faults or codes. I just don't want to pay the dealer to try to "test" the fuel pump and injectors. Is that even possible??

Since I'm suspecting fuel contamination as the cause I'm at a loss to have warranty pay. I have called Ducati and they are getting in touch with my dealer to make sure they contact the Local Area Mgr to ask for further testing ideas.

Main symptoms are
1) hesitation around 5k on acceleration
2) WOT at any RPm struggles to rev vs instant b4
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Old Jul 15th 2017, 09:26 AM   #10
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if the AFR values actually have changed, get new O2 sensors. Without O2 correction, the values are even uglier, which makes me think it's a more extensive use of closed loop regulation than what I've seen before...

As for warranty, what if you log your AFR lines before and after the tune? Worked for me over here...
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