question/request for riders of 2018-23 panigale v4 and or streetfighters

I don’t know of anyone with a street fighter who has this issue. It’s gotta be from the early engines and all those stupid recalls

bp_SFV4 said:

This isn't Reddit. Relax.

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Good one, I was actually mixing it up with FerraiChat LOL that site can be BRUTAL for derailing threads.

No one here takes it that seriously.

RdashP said:

@1hander, like @Vbreeze I too use my early 2018 V4S (production Q4 2017), with zero starting issues for now 30.000KM/18.500miles.
I too ride her anywhere in Europe from city traffic, mountain roads to occasional race tracks.

Actually, she started her life for the V4 Euro-launch campaign as one of the first V4’s rolling out of the Bologna factory as a Dutch press bike. I bought her with 4000km/ 2500miles on the clock.

Besides her also having received all recalls and updates under warrantee, being an early production bike, she also has quite some metal ‘prototype’ parts bolted on which were replaced by Ducati in later production bikes for standard less robust plastic parts, as can be found in the parts catalogue for a 2018 V4S.
Typically Italian, even while under Audi QC for more then a decade, this differs from part2part as my Duc dealer confirmed from servicing her. lol

In general, most products constantly receive revised/ different parts even within one model generation (e.g. due to recalls, change of/ more then 1 part-supplier for same partNo., required cost-cut, part-revision). So for a non-insider it will be quite hard to determine when a specific part was replaced by a succeeding part. With more than 1 production line a/o factory-inventory, part2part specs can even differ between bikes of same model and within same assembly-week!

So even if I’m able to hear these bubbling/ gurgling sounds, I don’t know and can’t tell without removing the tank assembly and visually comparing the specific part(s) you are having trouble with, if mine has the same official partNo’s. or a differently manufactured, pre-production/ prototype, part installed instead.

Hopefully this helps your analysis, not to add more confusion as to which parts were revised when by DMH?

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not all, thank you so much for the reply, i figured things were changed without actually changing part numbers.. to hear that your not having anyproblems is actually encouraging, and i feel like my bike can get there too.

RdashP said:

One last note, contrary to @Vbreeze, I always refuel with fuel with the highest available octane and lowest % of ethanol (E5), to have best possible performance, mileage and engine protection.
Effectively, in Holland this means refueling with 98RON (E5) and in Germany with ‘racing’ fuels with RON100+ (E5).

Turbo engines and highly tuned naturally aspirated combustion engines, like the V4, will perform better, safer and (i.e. turbo’s) arguably last longer with these performance fuels.

@1hander may be the gurgling/ bubbling sounds become less when using higher octane performance fuels?
Good luck finding a permanent fix.

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you bring up something that completely got by me, although i use only highest octane i can get here which is 91 RON 93 equivalent here in the states, i forgot about the ethanol that is in all fuel here in the states. finding no ethanol fuel is becoming very hard....the nearest station to me that i can get 109 octane unleaded is 65miles so too far and in the opposite direction of where i ride.

so i will find some non ethanol and try the test again, its very likely that the ethanol is making the fuel more volatile , ethanol free here is 87 aki, which is 91RON equivalent and meets the minimum, although they get you, its more expensive than 91aki/93RON, but a couple extra per tank is not a consideration for a bikes tank i think. but even if the boiling of the fuel in the lines goes away by changing fuel, it does not change the fact that the fittings in the base of the pump assembly are leaking, and if they leak air pressure back from vapors in the line(which facilitates the vapor locking/bubbling sound) , then the fittings are also leaking fuel pressure. so even if changing fuels fixes the vapor locking, the fittings are still leaking fuel pressure without the mods i made(that i dont know if they will work or not but im testing)

vapor pressure max here in the states is listed as 7.8 psi or something close to that. a fuel pump in this case is making between 40-65 psi im not sure. but if 7.8 psi leaks back like it does imagine how much fuel pressure is being lost at pump pressures. heres the leak i speak of ... ..... PLEASE EXCUSE MY LANGUAGE. i already have a thread going for this and my possible repair.


this is my solution, also im picking up a 2020 or newer pump assembly, i still have to test this in the heat where vapor pressure in lines at heatsoak is higher but first test was a success.. no vaporlock or bubbling could be heard in the tank. and i added heatshielding above the rear valve cover, which is directly under the pump base, (putting a massive amount of heat into the pump base making it expand and leak even more during operation.