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Steering head stem needed

 
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bimotanige



Joined: 12 Jul 2010
Posts: 582
Location: yorkshire
PostPosted: Thu May 14, 2020 11:57 am    Post subject: Steering head stem needed Reply with quote
Looking for a steering head stem. Its an interference fit with the bottom yoke hole. Its for an SB4 set of yokes and is nominally 24mm od although I would guess they re a fairly standard item across a lot of the earlier Bim ranges.
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KB1x2, SB3 SB4 BB1 DB2 Vdue Evo YB11 RB1 Ducati MHR Suzi GS650
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brian



Joined: 22 Aug 2011
Posts: 3790
Location: Australia
PostPosted: Fri May 15, 2020 2:41 am    Post subject: Re: Steering head stem needed Reply with quote
bimotanige wrote:
Looking for a steering head stem. Its an interference fit with the bottom yoke hole. Its for an SB4 set of yokes and is nominally 24mm od although I would guess they re a fairly standard item across a lot of the earlier Bim ranges.


Nige,

My DB2 steering stem is 26mm where the bearings mount, ie 26mm ID on the bearings. I can’t say for sure about other Bimotas.
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'99 DB4 #104, '96 SB6 #1165, '94 DB2 J #652, '99 DB4 #088, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, '94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, '61 BSA A10 650, '89 ZXR750, '91 Ducati 851
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bimotanige



Joined: 12 Jul 2010
Posts: 582
Location: yorkshire
PostPosted: Mon May 18, 2020 9:50 am    Post subject: Reply with quote
Hi Brian
Agreed the bearing will be a 26x52 taper roller. Remeasured both top and bottom yokes - still not grown from 24mm. I guess it must have a step in it - not very good engineering practice to create a stress point though especially at that point.
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