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 Post subject: Cog gear
PostPosted: Wed Oct 14, 2020 12:59 am 
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Joined: Sun Oct 06, 2019 1:28 am
Posts: 1
Location: USA
model: 750 Paso
year: 1986
I have replaced the sprag gear .bike started and ran ,for a little while ,then same problem again , would not start ,turns out cog gear is issue , removed and cleaned sanded with 1200 and replaced, now it will start , my question is how do I replace shaft that the cog gear is on ? , does it come out ? Any advice is welcome and greatly appreciated


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 Post subject: Re: Cog gear
PostPosted: Wed Oct 14, 2020 10:17 am 
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paso grand pooh-bah
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Joined: Thu Nov 03, 2011 10:13 am
Posts: 747
Location: Scotland
model: 907 I.E.
year: 1994
I presume you mean the starter intermediate gear? As far as I know the shaft is an interference fit into the crankcase half although I can't find any reference to replacing it in any Ducati workshop manual. Short of dismantling the engine you should be able to use a length of tube and suitable washers with a screw into the shaft to pull it out. You'd be best to heat the crankcase it the area of the shaft with a heat gun before pulling it .

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 Post subject: Re: Cog gear
PostPosted: Wed Oct 14, 2020 10:58 am 
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Joined: Thu Nov 29, 2007 2:38 am
Posts: 322
Location: UK
model: 907 I.E.
year: 1990
on the spare parts catalogue the gear is held with a circlip and the gear pin is bolted to the crankcase trough a long allen bolt.

my guess is that the pin is fitted with a slight interferance, and the bolt does the holding.


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 Post subject: Re: Cog gear
PostPosted: Thu Oct 15, 2020 9:11 am 
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paso grand pooh-bah
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Joined: Thu Nov 03, 2011 10:13 am
Posts: 747
Location: Scotland
model: 907 I.E.
year: 1994
angelix wrote:
on the spare parts catalogue the gear is held with a circlip and the gear pin is bolted to the crankcase trough a long allen bolt.

my guess is that the pin is fitted with a slight interferance, and the bolt does the holding.

Ah. That makes sense and explains the length of the bolt.

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1982 Pantah 500SL (now sold)


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 Post subject: Re: Cog gear
PostPosted: Thu Oct 15, 2020 3:19 pm 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3230
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
Sprag has to be the most troublesome part of these engines. I keep a supply of new springs and end up replacing them every other year. I have replaced the idle gear and shaft when experimenting with readily available springs I ended up welding the idle to the shaft during this trail. Yes the shaft is removable.In the end I found a guy in England sells the proper spring. I have also tried other types of sprags with no luck so far. Recently a new updated spag has become available From a source in Italy and I have one to try as once again it is slipping

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 Post subject: Re: Cog gear
PostPosted: Fri Oct 16, 2020 6:23 am 
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paso grand pooh-bah
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Joined: Wed Dec 05, 2007 12:35 am
Posts: 1755
Location: Newzealand
model: 906 Paso
year: 1990
Hi Higgy , do you think the sprag failures maybe oil type related. When I was still riding my Paso ( been near 15 years now ) I did about 60k kms on it and never had a sprag problem , did make some awful noises if it backfired when starting tho . I used valvoline xld oil . Just thinkin :-)

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 Post subject: Re: Cog gear
PostPosted: Fri Oct 16, 2020 3:34 pm 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
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Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
I think it is heat that sacks the spring so yes oil would have its part to play. Dont know if the st type oil slinger would help

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Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie


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 Post subject: Re: Cog gear
PostPosted: Fri Oct 16, 2020 8:58 pm 
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paso grand pooh-bah
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Joined: Wed Dec 05, 2007 12:35 am
Posts: 1755
Location: Newzealand
model: 906 Paso
year: 1990
I had a sprag "reverse" itself in an auto trans on my car (ZF 4hp22 ),pain in the arse as car wouldnt move off in drive , had to put it in L to move off then shift to D and then all was normal till next time I stopped .

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