748s cuts out at 7,500 rpm

Discussion in 'Technical Help' started by skyhigh123, Apr 5, 2012.

  1. My 2002 748s with 12,500 total mileage and complete service record goes very well as long as I don't exceed 7,500/8,000 rpm. As soon as I get it up to those revs, the engine seems to cut, everything slows down, and as soon as I reopen the throttle everything is fine until I hit those revs again. I have replicated the symptom once when trying it out in neutral but usually it will get up to 11,000 rpm with out any problem.

    I am new to Ducatis and sports bikes and I don't know what a rev limiter feels like when it cuts in but in my ignorance that's what it feels like is happening.

    Any comments, suggestions for possible checks I can make, possible causes and possible cures?

    thanks,
    Tony
     
  2. The first question would be ,when was the fuel filter
    last changed?

    brian.
     
  3. Thanks for the reply.

    It was serviced just over 2000 miles and a year ago. (The "10,000 km" service which specifies fuel filter change so I presume it was changed then).

    Is there a way to check the fuel filter to see if it is obstructing the fuel flow without removing it?
     
  4. I'd double-check that it was actually replaced: mechanics hate changing them and often find a reason not to bother.
     
  5. I bet you my inheritance (50p) that fuel filter wasn't changed!
    The filter is in the tank, also check the space under the pick - up. That also may be clogged up.
     
  6. Thanks again for the replies.
    Things do seem to be improving though. I found a tin of injector cleaner in my garage and poured half of it into the full tank, I also took off the fairings and checked and pushed together all visible wiring connectors. I then took it out for a 30 mile run on the beautiful empty French roads around here. After a mile or so I wound it up a bit and got the same symptom at around 8000 rpm. However, this was the only time it did it and afterwards I deliberately revved the motor quite hard and it got up to 11,000 rpm no problem. I pushed fairly hard in low gears and got over 9 or 10 thousand rpm plenty of times, no repetition of the problem.
    Fingers crossed it was just the bike demanding a bit of a blast after very little use over the winter.
    Tony
     
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