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@yahoo.com>
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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