Paso Starter question

discussions specific to the 750 Paso

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wcmiller2002
Posts: 22
Joined: Sat May 10, 2014 4:46 pm
model: 750 Paso
year: 1987
Location: USA

Paso Starter question

Post by wcmiller2002 »

Hello all,

Have a grounded out starter due to plastic insulator on positive end. Tore down and cleaned up commutator as well as brushes and replaced insulation. Brushes and commutator had minimal oxidation but quickly cleaned up.

Now will not turn when hooked up to battery.

Original part was 067050800. Replacement starters have part numbers 270400111A,27040111A,128000-6050 and appear to be an identical fit.

Rotation direction of newer starters has been alluded to, however no facts.

Please let me know any ideas or suggestions, as well as if the above later part numbers will work.

Thanks,

Chris
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Derek
paso grand pooh-bah
Posts: 768
Joined: Thu Nov 03, 2011 10:13 am
model: 907 I.E.
year: 1994
Location: Scotland

Re: Paso Starter question

Post by Derek »

I have no ideas why your original starter no longer works. Assembly?
The part no for the 907ie is 27040011A and is the same for the 900SS through to the injection models and also the ST2. The crankcases are basically the same throughout. This was superceeded by part no. 27040051A starting with the 749/999 series but is interchangeable with the earlier part no. This part no is continued through to the 848/1098 but the reduction gearing of the starter drive pinions was lowered. My MTS1200 has a different part no 27040101A and the starter motor pinion is no longer shown as a separate part, but the crankcases are the same as the 1098 so the earlier starter must fit too.
I conclude that all the starters are interchangeable but you may need to swap the pinion if using a later one.
1994 907ie
2017 Supersport 939
2015 Scrambler Classic
1982 Pantah 500SL (now sold)


Scotland
angelix
Posts: 338
Joined: Thu Nov 29, 2007 2:38 am
model: 907 I.E.
year: 1990
Location: UK

Re: Paso Starter question

Post by angelix »

are you sure the relais is working properly?

you can bypass the relais by "jumping" the starter directly from the battery, this way you can narrow the problem.

The other thing is that you disassembled the motor, can you fit the brush plate "the other way around or at 90 degrees? what i mean is that sometimes the position of the brush plate can effect the electric motor operations.... not sure if it can be applicable to a Paso starter, but I am quite sure that can occur on DC motors.... it is just a thought!!
wcmiller2002
Posts: 22
Joined: Sat May 10, 2014 4:46 pm
model: 750 Paso
year: 1987
Location: USA

Re: Paso Starter question

Post by wcmiller2002 »

Found the problem. The outside plastic insulator on the positive terminal had crumbled and shorted to ground. Wonder if I can get a warranty from Ducati after 28 years? ;-)

Put on rubber and phenolic washers and sealed up with RTV. Starter works now and off to other issues.

Thank you for your response!
Mc tool
paso grand pooh-bah
Posts: 1875
Joined: Wed Dec 05, 2007 12:35 am
model: 906 Paso
year: 1990
Location: Newzealand

Re: Paso Starter question

Post by Mc tool »

up grading/sizing the standard cables associated with the starter and earth can improve the starter performance significantly , there are even kits available ( FAQ's )
Hamish
I wish I was young again............Id be heaps smarter than last time
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Giscard
Posts: 120
Joined: Thu Apr 28, 2011 2:56 pm
model: 906 Paso
year: 1990
Location: Cardiff UK and Dordogne France

Re: Paso Starter question

Post by Giscard »

Mc tool wrote:up grading/sizing the standard cables associated with the starter and earth can improve the starter performance significantly , there are even kits available ( FAQ's )
Hamish
I hope it improves my Paso's starting Hamish as I have just ordered one. The video looks convincing :)
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