I had the same exact problem on my 98 ST. Chased everything, just as you are doing now. It ended up to be one of the temperature sensors on motor. There are two of them. One, for some strange reason, feeds your gage. the other feeds your ECU. I swapped the leads, and sure enough. I watched the gage float all over the place, just like the motor was doing. When it goes to ground, it tells the ECU the motor is stone cold, and it gets really rich and runs horribly. then it changes like a young girls mood and everything is good again. No rhyme or reason for it floating, it just roamed around rather randomly. I think flaky would be the best description.
Swap the sensors and see if that works for you. Get some one to help you put their finger in the sensor hole so you don't loose too much coolant.
They are cheap on e-bay. Common on all the water cooled motors, as long as the connector looks the same.
Good luck.
Phil
--- In st2_owners@yahoogroups.com, Jack Davidson <tdma@...> wrote:
>
> Could have a clogged vent. When it does the sputter, pull over to the
> side, open the filler and see if there's a vacuum "whoosh." Shouldn't
> be. There's a little ball check valve in the filler assembly that
> should open, to let air in and replace burned fuel. Especially when
> you've just filled up, this can cause high-engine-speed problems.
>
> Jack in NY
>
> On 2/13/2011 6:22 PM, Darrel Thurman wrote:
> >
> > I remember reading a while back where a tube in the tank was pinched
> > and causing issues.
> >
> > Darrel
> >
> > On 2/13/2011 4:33 PM, HOPPER ELDRIDGE wrote:
> >
> >> I would swap out coils, control boxes, but it now seems that it is a
> >> common problem to both cylinders. I have very little knowlege of fuel
> >> injection and none experience wise. I'm almost leaning to the fact
> >> that the injectors themselves might be awry. I'm not sure how these
> >> work, might be stroke length or time of injection that supplies the
> >> proper amount of fuel, so something may be amiss there. Read up in
> >> the manual about the injectors to see if something jumps out at you.
> >> Hopefully some of the more astute artifers of the list can shed a
> >> brighter light on the subject.
> >> You use the term "grab a handful" in your description. Does that mean
> >> that it only bogs down when you snap open the throttle but runs OK at
> >> a steady or slowly opened throttle? If so, that would probably mean a
> >> lean condition, meaning the injectors are not responding with the
> >> correct amount of fuel. Be like a lean bog on a non-constant velocity
> >> type of carb. The butterflies open letting in a huge amount of air
> >> but does not feed in the appropriate amount of fuel...so could be the
> >> injectors. Do you use a name brand of gasoline? I've had problems in
> >> the past using off brand/no-name brands of gas. They do not have the
> >> additives that will keep the injectors clean. Maybe the Lucas (LuCUSS
> >> electricks for those of us with ye olde BritBikes! <LOL>) gas
> >> additive is an injector cleaner too and with a few more tanks of gas,
> >> will clean your system up. Otherwise put some dedicated injector
> >> cleaner in the fuel and run a few tanks through and see what happens.
> >> Hope someone else will respond later today when they get in from riding!
> >> Hopper
> >>
> >> ----------------------------------------------------------
> >> *From:* k m <ducmays@...>
> >> *To:* st2_owners@yahoogroups.com
> >> *Sent:* Sun, February 13, 2011 3:57:15 PM
> >> *Subject:* Re: [DucatiST] ST2 sputter
> >>
> >> Thanks Hopper for the impute.. Yea Ive ran two tanks of gas through
> >> it along with a quart of Lucas branded cleaner- half in each tank.
> >> both pipes felt the same after riding( forgot to mention that
> >> earlier) At idle i have would no idea as it doesn't act up at idle.
> >> It idles just fine starts perfect, but seems when I want to hit grab
> >> a handful she bogs down. St2 is a fuel injected model. When you say
> >> swap components, what is this refering to?? sensors,temp controls?
> >> ----------------------------------------------------------
> >> *From:* HOPPER ELDRIDGE <hoppereldridge@...>
> >> *To:* st2_owners@yahoogroups.com
> >> *Sent:* Sun, February 13, 2011 4:37:37 PM
> >> *Subject:* Re: [DucatiST] ST2 sputter
> >>
> >> Your problem could be a separate problem this time from before, just
> >> coincidental.
> >> So just a thought, easy and cheap to do....with all the cold, maybe
> >> the service station hadn't received new fuel and was pumping fuel at
> >> the bottom of this tank. You may have gotten some water in the fuel
> >> that's giving you problems. Put some rubbing alcohol in your tank,
> >> maybe 6 or so ounces and then see if the problem goes away. The water
> >> is not miscible with the gasoline but is with the alcohol which in
> >> turn is miscible with the gasoline so that you are burning the water
> >> with the gasoline and alcohol mix. You can also buy some propriety
> >> alcohol at your local auto parts store that does the same
> >> thing...just more expensively. Read the instructions as to how much
> >> to add to a given amount of fuel.
> >> If not the above..some trouble shooting..can you tell if the problem
> >> seems to be on one cyclinder or is it both. If one exhaust is running
> >> cooler than the other, you know which cylinder is bad. When you fire
> >> her up from cold and she's acting up, feel the exhaust pipes as you
> >> idle and see if one is cooler. If that is the case, start swapping
> >> out one component at a time to see if the problem transfers to the
> >> other cylinder. That should be you culprit. If it appears to affect
> >> both cylinders, then it is a common problem to both cylinders so look
> >> in that direction.
> >> If it is the fuel pump cutting out, you will not hear the pump
> >> ahummin'. There are several shelf pumps at the auto parts stores that
> >> can be used as a substitute for the $$$Ducati$$$ item. Not sure about
> >> the ST4s, but it is true for the 900 Supersports. Maybe some one on
> >> the list can help here. I'm in the middle of Nowhere, south Texas on
> >> a drilling rig so don't have my shop manual and notes with me as to
> >> what fits...I think it was for an early Mustang, though, but make
> >> sure the pressures are correct for carby or FI, depending on what you
> >> have.
> >> Here I'm showing my ignorance...was the '98 carbed or a fuel
> >> injection system..feel it was FI, though. If it is carbed, put about
> >> 6 ounces of Marvel Mystery Oil in the gas tank. It will lube the
> >> vacuum piston/slide so that the slide follows demand better. It could
> >> be hanging up when you give her throttle, thus the bogging.
> >> If it's FI, maybe the fuel pump is backing off on pressure at times
> >> and not feeding the injectors at the pressure they need. I'm more a
> >> carb guy since my new to me '03 ST4s is my first FI bike. Before, the
> >> '96 900SS/CR was carbed and my G'Wings and then Anal carbed
> >> BritBikes. On the G'wings and the 900SS/CR, the Marvel Mystery Oil
> >> trick worked/works well.
> >> G'luck and let us know what you find out so we'll be better informed
> >> if we get the same "shituation"
> >> Hopper
> >>
> >> ----------------------------------------------------------
> >> *From:* ducmays <ducmays@...>
> >> *To:* st2_owners@yahoogroups.com
> >> *Sent:* Sun, February 13, 2011 2:53:45 PM
> >> *Subject:* [DucatiST] ST2 sputter
> >>
> >> Hi to all. Been following this site for years now and now have a
> >> question. I have a 98 st2 that has developed a sputtering issue. Just
> >> got back in from a ride today thinking the issue was fixed. Here is
> >> whats happening. At random intervals the Silver Duc will develop a
> >> sputter-clog-no power on the throttle. Like a big bog then finally
> >> comes back around. Heres what I have done. Thinking it might be a
> >> clogged fuel filter I took out the entire fuel supply assembly
> >> replaced with new hoses, fuel filter and gasket. Also have checked
> >> the coil pack and have brand new spark plugs and plug wires. Thought
> >> problem was fixed but on ride today (60 degrees here in NC, sorry
> >> boys) the problem arose again at the 120 mile mark.This was
> >> noticeable after filling up with gas around 5 miles after. Could this
> >> be the fuel pump???? Any incoming comments would be appreciated. Has
> >> anyone else experienced this issue??
> >>
> >> 98 St2
> >> Ducmays
> >>
> >>
> >> ----------------------------------------------------------
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