Results 1 to 9 of 9

Thread: Help with Ducati diagnosis please.....

  1. #1
    Join Date
    3rd March 2008 - 11:55
    Bike
    86.249 93.398 00.944
    Location
    The evil flatlands
    Posts
    2,281

    Help with Ducati diagnosis please.....

    The dirty old ST2 is being a pig, and I'm out of ideas.

    Won't start or idle without the choke (well, idle adjust) almost completely on, usually it will idle happily with it completely off unless it's really cold.

    The thing revs ok, but when being ridden when the throttle is opened it coughs for a bit, then picks up and runs normally.

    Have had a couple of problems in the past with electrical connections, so have cleaned up the usual suspects without any improvement.

    Any suggestions gratefully received.
    Riding cheap crappy old bikes badly since 1987

    Tagorama maps: Transalpers map first 100 tags..................Map of tags 101-200......................Latest map, tag # 201-->

  2. #2
    Join Date
    24th September 2004 - 06:46
    Bike
    '76 CB550 Super Sport
    Location
    On the road to nowhere...
    Posts
    7,414
    Bad fuel maybe?

  3. #3
    Join Date
    20th January 2010 - 14:41
    Bike
    husaberg
    Location
    The Wild Wild West
    Posts
    11,823
    Pretty sure the faualt lies with Italian manufacturing
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  4. #4
    Join Date
    3rd March 2008 - 11:55
    Bike
    86.249 93.398 00.944
    Location
    The evil flatlands
    Posts
    2,281
    Quote Originally Posted by Bonez View Post
    Bad fuel maybe?
    Could be, although it hasn't been sitting for long, suppose I could drain it and chuck some fresh stuff in to cross something off the list.
    Riding cheap crappy old bikes badly since 1987

    Tagorama maps: Transalpers map first 100 tags..................Map of tags 101-200......................Latest map, tag # 201-->

  5. #5
    Join Date
    28th January 2015 - 16:17
    Bike
    2000 Ducati ST2
    Location
    Lower Hutt
    Posts
    1,274
    Hi Neels

    I'd suggest checking the O-rings sealing the inlet manifolds to the cylinder heads. Ducati didn't use a gasket here for once. If they've gone then you'll have vacuum leak and lean mixture, especially at part throttle / starting. I'm just about to change mine out after having realised that they're almost certainly 20 y.o. originals and will have squashed flat over time.

    Unfortunately on the ST2 it's a pig of a job. To get clean access, the tank's got to come off, then the airbox, then the injectors. Do you have a set of vacuum gauges?

  6. #6
    Join Date
    13th June 2010 - 17:47
    Bike
    Exercycle
    Location
    Out in the cold
    Posts
    5,624
    I'd do a vacuum synch before anything else. When there's a TPS on one throttle body - or carb for that matter - and it goes out of synch with the other, the map for that side goes out of phase. What you're experiencing seems to be the common symptoms of this.
    To do it right of course means checking valve clearances too...

  7. #7
    Join Date
    24th November 2005 - 12:40
    Bike
    anything I can get my grubby wee paws on
    Location
    Outside
    Posts
    1,497
    Quote Originally Posted by neels View Post
    Could be, although it hasn't been sitting for long, suppose I could drain it and chuck some fresh stuff in to cross something off the list.
    That's definatly the easiest place to start.

    As well as stale fuel, you might have water in tank from condensation on the inside.

    Make sure you drain it completely, as there is often a little left over the tank even on reserve.
    =mjc=
    .

  8. #8
    Join Date
    25th March 2004 - 17:22
    Bike
    RZ496/Street 765RS/GasGas/ etc etc
    Location
    Wellington. . ok the hutt
    Posts
    20,500
    Blog Entries
    2
    Injected bike seem keen on giving up with a bit of water. Drain or pump out as much as possible and add some meths. Shake Then add fresh gas.
    Don't you look at my accountant.
    He's the only one I've got.

  9. #9
    Join Date
    28th January 2015 - 16:17
    Bike
    2000 Ducati ST2
    Location
    Lower Hutt
    Posts
    1,274
    Hi Neels,

    Have just found what look like cracks inside both inlet manifolds on my ST2, under the rubber boots. The boots themselves look like they've gone hard and started opening up from the aluminium. I've put photos in the Summer Running thread.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •