starter motor failure

discussions specific to the 907IE
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g.m.c.janssen
Posts: 40
Joined: Mon Jun 01, 2009 6:33 am
model: 907 I.E.
year: 1993
Location: Leiden, The Netherlands

starter motor failure

Post by g.m.c.janssen »

Hi there,

My 907 starts perfectly when cold. But after a ride and short stop, the engine still warm/hot, the starter motor rotates very slow and hardly turns the engine. Finally after a few attempts the engine starts. Next morning no problems, starting perfectly again. Battery is almost new.

any ideas?
Laverda 750SF, 1972
Laverda 1000 3CE, 1974
Moto Guzzi LeMans 3, 1983
Ducati 907 i.e. 1993
Mc tool
paso grand pooh-bah
Posts: 1875
Joined: Wed Dec 05, 2007 12:35 am
model: 906 Paso
year: 1990
Location: Newzealand

Re: starter motor failure

Post by Mc tool »

Check the condition of all the battery , starter, and earth cables , especially the crimped on terminals , and if that don't sort it next is the starter solenoid /relay and then the starter itself. There is a kit available to replace all the cables ( search tech stuff here ) and this apparently is the ducks nuts. :)
I wish I was young again............Id be heaps smarter than last time
g.m.c.janssen
Posts: 40
Joined: Mon Jun 01, 2009 6:33 am
model: 907 I.E.
year: 1993
Location: Leiden, The Netherlands

Re: starter motor failure

Post by g.m.c.janssen »

Mc tool wrote:Check the condition of all the battery , starter, and earth cables , especially the crimped on terminals , and if that don't sort it next is the starter solenoid /relay and then the starter itself. There is a kit available to replace all the cables ( search tech stuff here ) and this apparently is the ducks nuts. :)
Mc tool, thanks for the advice. I will sort out these suggestions, but I still do not understand why there is a difficulty only when the engine is hot? I searched for replacement of all the cables, but could not find it here :( I only found replacement of the main cables, is that what you meant?

http://www.motolectric.com/makes/ducati.html
Laverda 750SF, 1972
Laverda 1000 3CE, 1974
Moto Guzzi LeMans 3, 1983
Ducati 907 i.e. 1993
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paso750
paso grand pooh-bah
Posts: 5558
Joined: Sun Jul 18, 2004 12:00 am
model: 750 Paso
year: 1987
Location: southern Germany

Re: starter motor failure

Post by paso750 »

eletrical resistance of a conductor does increase with heat. Which effect that has will depend on the condition of the wiring. I`d remove the wires from the battery, starter relay, starter and clean all contacts first. Then do the same with the ground wires from the battery to the frame/engine and try again. Do check if you see any corrosion on the wires (copper rust).
The Motolectric kits are the ones but you can also get some made (i.e. by your local car stereo shop).
User avatar
du907
Posts: 346
Joined: Fri Jul 08, 2005 12:00 am
model: 907 I.E.
year: 1992
Location: Winston-Salem, N.C. USA

Re: starter motor failure

Post by du907 »

The electrical cable upgrades that most are talking about is:
http://motolectric.com/makes/ducati.html
I hear this modification really makes a difference.
I would check all the grounds and connections of the cables as mentioned. There are some ground places under the tank towards the front.
Good luck.
du907
g.m.c.janssen
Posts: 40
Joined: Mon Jun 01, 2009 6:33 am
model: 907 I.E.
year: 1993
Location: Leiden, The Netherlands

Re: starter motor failure, problem solved

Post by g.m.c.janssen »

Problem solved. I removed all cables and cleaned all connections. Especially the connection on the relay coming from the battery was heavily corroded. The starter motor now rotates happily also with a hot engine. :thumbup:
Thanx all for the help
Laverda 750SF, 1972
Laverda 1000 3CE, 1974
Moto Guzzi LeMans 3, 1983
Ducati 907 i.e. 1993
g.m.c.janssen
Posts: 40
Joined: Mon Jun 01, 2009 6:33 am
model: 907 I.E.
year: 1993
Location: Leiden, The Netherlands

Re: starter motor failure

Post by g.m.c.janssen »

On road in Belgian Ardennes
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on road in Belgian Ardennes
on road in Belgian Ardennes
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Laverda 750SF, 1972
Laverda 1000 3CE, 1974
Moto Guzzi LeMans 3, 1983
Ducati 907 i.e. 1993
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