350 Widecase bearing help

[IanG]

Good Afternoon form not so sunny Scotland! I am posting on behalf of my father who is currently restoring 3 Ducati Singles (1 Race & 2 Road versions) Very nice site you have here, now down to business

Requiring information or/and source of a right hand side Main bearing for a 350 Widecase. It must be a special bearing because I am spending a fortune on getting wrong ones.

The outside diameter is 72 mm
The inside diameter is 30 mm

Depth of the crankcase bearing housing is 20 mm but the thickness is not known. The bottom bevel fouls the inner carrier of the bearing, leading me to believe that there is a fitted a spacer set in the crankcase or the outer ring of the bearing has an offset.

The haynes manual shows something different about the bearing but the Ducati part list No 75120/3075 has come up with a completly different bearing, although the inside is the correct diameter.

Wonder if any of you kind chaps can help me a bit please.

Thanks
Ian

[Robin172]

Try Nigel Lacey on 01305 822549, he will be able to give you the info you need.

[IanG]

Thanks, Is he a dealer? where abouts is he located, UK?, USA?

Thanks

[Eldert]

Hi Ian
here is the scoop , when the first widecases where build they had a
6206 bearing . this bearing is 62 X 30 and 16 mm wide
later on in the production they changed to a bigger bearing a 6306
this bearing is 19 mm wide and will hit the bottom bevel gear
the factory solved this problem by reducing the outside diameter
of the bevelgear so you need another bevelgear
or grind down the one you have
you need the one on the right side in this picture
http://www.beneluxheads.com/album_showp ... ic_id=8099

Regards Eldert

[Robin172]

Nigel runs Lacey Engineering, where he specialises in racing Ducatis. His premises are located in Portland, Dorset.

[IanG]

Hi Ian
here is the scoop , when the first widecases where build they had a
6206 bearing . this bearing is 62 X 30 and 16 mm wide
later on in the production they changed to a bigger bearing a 6306
this bearing is 19 mm wide and will hit the bottom bevel gear
the factory solved this problem by reducing the outside diameter
of the bevelgear so you need another bevelgear
or grind down the one you have
you need the one on the right side in this picture
http://www.beneluxheads.com/album_showp ... ic_id=8099

Regards Eldert

SUPERB!!! thats just solved 3 months of head scratching

Thank you very much

[IanG]

Nigel runs Lacey Engineering, where he specialises in racing Ducatis. His premises are located in Portland, Dorset.

Thank you!

[Steved]

Or if you are still looking, I purchased both from a company called The Vintage Bearing Company - www.vintagebearings.co.uk.

1 off standard 6306 (30x72x19)
1 off 6306 (30x72x19) with snap ring 78.6mm od

I think that these are the ones that you are on about which fit my '74 250

Good luck,
Steve