Hi everybody. I have a Ducati s4r 996 i have exhaust system open airbox with k&n filter and some tweaking on the Co trim, the bike runs a little bit rich but this is just until the power commander to arrive. To the problem now, two days ago right after work i hit the highway, it was like 23.00 and it was chilly, i had the bike on the stand for 5 min at least before i start. I aggressively accelerate, hitting the rev limit on the 4th gear i switch on the 5th ant then the power cut off at around 5000 rpm. Ever since the bike doesn't rev over 5000 rpm aprox. If i go gentle maybe rev like a thousand more then drops again. The same thing happens when it is on the neutral. If i stay on the gas it goes to the 5000 and drops back again a drops. I check the fuel filter the fuel pump i changed the fuel and clean up the gas tank nothing changes though. I am thinking that is maybe the spark plug is that a case? Please HELP

SOURCE: 98 gsxr cuts out around eight g when accelerating but fine in N

Sounds like you're running out of fuel. It doesn't take much power (ie, fuel) to rev it in neutral, which might explain why it does that fine but falls over under load. Checked your fuel pressure/pump/filter?

SOURCE: cutting out at higher rpm

If the engine is the DOHC 16 valve engine inline 4, and has multiple carbs, then I have 2 suggestions for you, First thing I would take the carbs off, as a whole rail, and have them ultra-sonically cleaned at a shop, and the diaphragms checked in the tops. After that, you need to have the carbs synced while on the bike. I have a GSF600S and it was basically opposite your problem, it had a sputter in the low rpm range, and the carb syncing fixed it, and they honestly weren't that far off. The way those carbs feed fuel, if one is giving too much fuel then it will cause ur plugs to foul, or flood that cylinder, causing the issue. For the carb syncing I suggest building this tool, which I did for my bike.
http://www.powerchutes.com/manometer.asp
It's a liquid column differential manometer, which very accurately and sensitively measures the vaccum on the different cylinders of the engine. The only other thing I can think of is your ECM, which controls the engine, and incorporates your rev limiter. These are pretty pricey, so I would do the steps above first.

SOURCE: 07 gsxr 600 cuts out at 10,000 rpm drops suddenly

chech side stand swich

SOURCE: Misfiring 2007 Honda VFR 800

try new plugs also maybe a different plug also check air filter is clean

SOURCE: Misfiring 2007 Honda VFR 800

I would say that your bike may be running a little lean. I usually replace the jets on all my bikes as soon as I get them as the emissions requirements mandate that the manufacturers pass stringent emissions tests prior to the dealer selling them. Some bikes wont even idle or run, especially off road bikes from places like California. and in these cases you must re jet it is a must! I even throw away or drill larger holes into my air cleaner cover.

Good Luck!
Geodesygold