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Thread: Charging woes on my Supersport.

  1. #1
    Join Date
    18.07.2018
    Location
    North Pennines
    Ducati models
    750 SS
    Posts
    9

    Default Charging woes on my Supersport.

    Finally traced a charging problem to the stator on my '93 750SS. A couple of the windings were rubbing against the ignition flywheel and had worn through, so I need a replacement.

    I thought the 750SS and 900SS stators were identical, so I ordered an Electrosport one from M and P for a 900SS for 97. It fits into the casing and appears identical apart from the wiring connector (easily changed). However, the two grooves that accommodate the two fixing screws are not machined as deeply into the stator body as my old 750SS stator, so the fixing screws won't fit, and it will have to be returned.

    Can't find a secondhand one and the only new ones I can find are far more expensive. Any ideas where I could get one at a reasonable price?

  2. #2
    Join Date
    19.12.2005
    Location
    Forfar, Angus
    Ducati models
    Supersport 939, 907ie
    Other bikes
    Pantah 500SL, Scrambler Classic
    Posts
    8,531
    They are the same. Sounds like a manufacturing error with your replacement. Can't you use longer screws?
    Alternative from Electrexworld but a good bit dearer at 125.
    Or you could try Westcountry Windings to get your old one rewound.

    Old enough to know better, young enough not to care

  3. #3
    Join Date
    18.07.2018
    Location
    North Pennines
    Ducati models
    750 SS
    Posts
    9
    Thanks for confirming that they are the same, Derek. Do you know if they are the same Ducati part number also?

    On the Electrosport stator, the semi-circular grooves machined into the outside to accommodate the mounting screws are not large enough radius. (see pic for comparison). Perhaps it is a manufacturing fault - these are made in China, but then, so is everything.

    The Electrex World Stator actually costs 150 with the vat, while Westcountry Windings don't have a great reputation in some quarters. Bit fed up having to shell out that sort of money when I have only just bought the bike.

    On the plus side, I ventured out on the 750SS the other day for the first time and went for a forty mile blast on local roads and absolutely loved it.

    First time on a bike since 1989! Didn't dare go any further with a dodgy charging system, but looking forward to another ride soon.
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  4. #4
    Join Date
    19.12.2005
    Location
    Forfar, Angus
    Ducati models
    Supersport 939, 907ie
    Other bikes
    Pantah 500SL, Scrambler Classic
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    Ah! I see what you mean about the grooves. Not a hope in hell in fitting that without machining to a bigger radius.
    Sorry I can't confirm that the 750 and 900 have the same part number but as they are both the same spec I'd be very surprised if they are not.
    There are 3 part numbers for the 900;
    Very early ones had a 300W alternator p/n 26440031A
    That was superseded with a 350W alternator p/n 26440041A
    For 1995 that was changed again, still 350W but p/n 26440122A
    The same alternators were fitted to the Monster models.

    Old enough to know better, young enough not to care

  5. #5
    Join Date
    19.12.2005
    Location
    Forfar, Angus
    Ducati models
    Supersport 939, 907ie
    Other bikes
    Pantah 500SL, Scrambler Classic
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    Stein DInse show the same alternator for all the Supersports, Monsters, and the 851/888 and apparently the 748/916 alternator also fits. They only sell the complete alternator though and it is expensive.

    Old enough to know better, young enough not to care

  6. #6
    Join Date
    26.02.2008
    Location
    West Lothian
    Ducati models
    888 SP5,916 Strada,DB2SR
    Posts
    510
    Why was the flywheel rubbing? - is there an issue with the flywheel, or crank?

    I can sympathise though, I've got a charging issue on my 888 at the moment that I still need to fully diagnose and fix. From some of the brief diagnosis results that I found at the weekend, I suspect it might be the stator also, but haven't confirmed that.

  7. #7
    Join Date
    19.12.2005
    Location
    Forfar, Angus
    Ducati models
    Supersport 939, 907ie
    Other bikes
    Pantah 500SL, Scrambler Classic
    Posts
    8,531
    Quote Originally Posted by hindsight View Post
    Why was the flywheel rubbing? - is there an issue with the flywheel, or crank?
    Good point Mike.

    Old enough to know better, young enough not to care

  8. #8
    Join Date
    18.07.2018
    Location
    North Pennines
    Ducati models
    750 SS
    Posts
    9
    Yes, a good point indeed.

    My conclusion is that the stator was badly manufactured with the coils simply wound too large to fit the space, so a couple of the coils were touching against the flywheel.

    I have checked the flywheel itself and there is no play or runout, so that isn't the cause.

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