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17-05-2020, 01:07 PM | #1 |
Registered User
Join Date: Feb 2014
Location: Powys
Bike: M900
Posts: 334
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Starter motor change - '93 M900
Not sure if this should go in 'engine, clutch and gears' as its a mechanical question, or 'electrics' as its a motor. If I'm in the wrong spot, sorry!
I've just got the Keihin carbs in, fitted, engine running and, so far, no fuel leaks. I'm happy! Then the bike stops dead, no electrics at all. Main 30a fuse blown, fuse replaced, electrics now working - apart from the starter. Investigation shows the motor failed, and is totally open circuit. How big a job is removal and replacement please? Is it likely to be something in the motor that I can sort easily (worn brushes for example) or should I just get a new motor ordered? Thanks all! Ps it sounded well with the carbs, and seemed eager to rev! I've not ridden it yet however... |
17-05-2020, 01:26 PM | #2 |
Transmaniacon MOC
Join Date: Sep 2013
Location: Sutton In Ashfield
Bike: Multiple Monsters
Posts: 6,085
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It's not a big job but laborious since it involves removing the left hand cover as there is one additional internal bolt holding the starter motor as well as the 2 external ones. They put holes in the starter gear wheel so you can get it undone easily once the cover is off.
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17-05-2020, 01:31 PM | #3 |
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Join Date: Sep 2013
Location: Sutton In Ashfield
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You'll need an alternator puller and to be aware of the bolts that are near the clutch slave/rear sprocket and make sure you remove them first before pulling the cover off.
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Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage |
17-05-2020, 01:33 PM | #4 |
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Join Date: Jul 2003
Location: East London
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alternator COVER puller, the alternator shouldn’t need touching
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17-05-2020, 01:37 PM | #5 |
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Join Date: Sep 2013
Location: Sutton In Ashfield
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yea sorry, thanks Rob, cover puller.
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Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage |
17-05-2020, 01:42 PM | #6 |
Transmaniacon MOC
Join Date: Sep 2013
Location: Sutton In Ashfield
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Also be aware if replacing the starter with a different one, that most are the same motor unit but the later ones had a different gear fitted. (Post '00 or 01' I think iirc, maybe earlier?). I don't know if it's possible to swap the gears over however.
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Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage |
17-05-2020, 01:43 PM | #7 |
Too much time on my hands member
Join Date: Jan 2013
Location: Shipbourne
Bike: M900
Posts: 1,422
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You will need the cover extractor tool about £10 off e bay that screws into the two 6 mm screws on the outside of the inspection plate on the alternator cover.
DO NOT FORGET the screw holding the alternator cover near the clutch push rod area if you do and use the extractor tool you will crack the alternator casing. Do not ask me how I know. Ducati does not supply gaskets for the alternator cover any more preferring to rely on their expensive gasket goo. Use this sparingly as any surplus squeezed out on the inside of the alternator casing ends up in the sump and/or possibly oilways. When tightening the power cable to the new starter motor make sure the post itself does not turn if it does you stand a good chance of destroying the internal wires to the brushes. With the extractor tool and no recalcitrant fasteners about an hours job start to finish |
17-05-2020, 01:50 PM | #8 |
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You can I think still get gaskets from Exact fit/CCW if you want one.
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Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage |
17-05-2020, 01:53 PM | #9 |
Registered User
Join Date: Feb 2014
Location: Powys
Bike: M900
Posts: 334
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Thanks to all who’s replied so far!
I‘ve been looking at the Haynes manual and it seems to imply I need to remove gears from under the alternator cover to access bolts? I’ve had the cover off before when the gasket started leaking last year and have a homemade puller, it’s not ideal but does work. I take it it’s a oil drain first too? Thanks again! |
17-05-2020, 01:57 PM | #10 |
Transmaniacon MOC
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You shouldn't need to remove any gears afaik there are holes in the gear wheel that will allow you to get an allen key in to undo the starter motor bolt.
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Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage |
17-05-2020, 02:18 PM | #11 |
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17-05-2020, 02:45 PM | #12 |
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the gears swap out, no problem, if you need to. just held on with a circlip.
the later ones my have an extra lug for a fourth bolt at the other end but should be interchangeable anyway. Last edited by slob; 17-05-2020 at 02:52 PM.. Reason: added pics |
17-05-2020, 02:57 PM | #13 |
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So now you know. it's Just another step. I did think it would be possible but I hadn't heard of it being done before. Thanks Rob
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Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage |
18-05-2020, 08:49 AM | #14 |
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Join Date: Sep 2013
Location: Glasgow
Bike: S4 challenge
Posts: 447
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I've done the job recently. Ended up buying a new starter motor (circa £110) as the brush repair kit was around £40.00, being lazy/mechanically inept I went for the easy option.
If you are buying a new starter make sure you keep the cog from the old one and swap it over. I didn't and had to do the job again. |
18-05-2020, 09:11 AM | #15 |
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and don't forget the 'sharp' side of the circlip sits outwards
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