primary pinion and woodruff key on Ducati single

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rospo
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Joined: Tue Nov 08, 2011 4:19 am

primary pinion and woodruff key on Ducati single

Postby rospo » Mon Dec 10, 2012 7:45 am

Hi. Me again. Is the primary drive helical pinion on my 450 Ducati supposed to have a recessed interior? I can't see the point unless the previous owner was into some weight saving. If that is normal, what size of woodruff key goes into the shaft / pinion? Which work better: tab washers or spring-type washers? Hope someone can help here. Thanks in anticipation. Ross

graeme
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Re: primary pinion and woodruff key on Ducati single

Postby graeme » Mon Dec 10, 2012 9:32 am

Hi, pinion gear is sold as standard. The half moon key is 4mm

Ventodue
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Re: primary pinion and woodruff key on Ducati single

Postby Ventodue » Mon Dec 10, 2012 12:18 pm

graeme wrote:The half moon key is 4mm

And available from Nigel Lacey - along with the correct tab washer. And a new nut ... and shims, should you need 'em :)

Image

P.s I think there may be a shoulder machined on the inside of the pinion -? Tsk! Can't remember now ... :? Best ask Nigel!

Eldert
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Re: primary pinion and woodruff key on Ducati single

Postby Eldert » Mon Dec 10, 2012 1:12 pm

recessed interior ? do you mean the oil groove thats machined in there .

Eldert

joe46ho
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Re: primary pinion and woodruff key on Ducati single

Postby joe46ho » Mon Dec 10, 2012 7:44 pm

Hi,

I believe, as Eldert has already mentioned, you must be refering to the oil grove... It IS supposed to be there, and as far as I know is there on all Ducati single primary gears... As for the washers, I use the original tab washers myself, some claim the "spring" or bellville washers are the way to go, to each his own I guess... Here are some pics of a primary gear up close, the factory drawings can be deceiving at times...
Joe
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rospo
Posts: 8
Joined: Tue Nov 08, 2011 4:19 am

Re: primary pinion and woodruff key on Ducati single

Postby rospo » Tue Dec 11, 2012 6:44 am

Mine seems to be bigger than just an oil groove. I know the previous owner did quite a lot of work on the engine. Thanks for your help. I am going to try again with a tab-washer.


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