BritBike Forum logo
BritBike Sponsor BritBike Sponsor BritBike Sponsor
BritBike Sponsor

BritBike Sponsor

BritBike Sponsor
BritBike Sponsor BritBike Sponsor BritBike Sponsor
  JWood Auction  
Home | Sponsors, Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons, "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
Photo posting tutorial

Member Spotlight
Mark Z
Mark Z
Owego, NY, USA
Posts: 4,196
Joined: August 2001
Show All Member Profiles 
Shout Box
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Random Gallery photo
Who's Online Now
202 registered members (57nortonmodel77), 1,559 guests, and 560 spiders.
Key: Admin, Global Mod, Mod
Newest Members
Regi, Doug Baril, revans, Gilly, XTINCT
9961 Registered Users
Top Posters(30 Days)
btour 185
koan58 99
Stuart 86
NickL 70
Popular Topics(Views)
440,052 mail-order LSR
Forum Statistics
Forums33
Topics65,304
Posts632,412
Members9,961
Most Online3,995
Feb 13th, 2017
Like BritBike.com on Facebook

Previous Thread
Next Thread
Print Thread
Rate This Thread
#701126 - 07/08/17 5:32 pm BSA A65 main bearing question (DS)  
Joined: Aug 2012
Posts: 553
Dana_twin Online confused
BritBike Forum member
Dana_twin  Online Confused
BritBike Forum member

Joined: Aug 2012
Posts: 553
Oregon
My 1966 motor has the ball bearing on the crank drive side (67-1240) but I see the later engines (1967-68?) used the roller bearing 68-0625 so I can go ahead and just use 68-0625 instead? Anything else to note if making this change?

Support Your #1 BritBike Forum!
Membership Type! Free
Member
Premium
Member
Premium Life
Member
Vendor
Member
Site
Sponsor
Recognition No Premium Member Premium Life member (5 years) Vendor Member Site Sponsor Membership
Post commercial threads No No No Yes Yes
Custom title No Yes Yes Yes Yes
Upload avatar & photos No Yes Yes Yes Yes
Link avatar & photos Yes Yes Yes Yes Yes
Private Message Storage: 10 100 100 100 100
Length of signatures 255 600 600 600 600
Removes this very advert island between post 1&2 No Yes Yes Yes Yes
Price Free $12.90/year $105.00 No End
$55.00/5 years
$210.00/year
($17.50/month)
Email
Click on button >>
  Premium Member Premium Life member Vendor Member Site Sponsor Membership
#701153 - 07/08/17 10:51 pm Re: BSA A65 main bearing question (DS) [Re: Dana_twin]  
Joined: Jan 2004
Posts: 3,517
DMadigan Offline
BritBike Forum member
DMadigan  Offline
BritBike Forum member

Joined: Jan 2004
Posts: 3,517
ca, us
You need to provide for the end float. The later engines had shims between the roller and crank with a bronze thrust bush on the timing side. I presume your cases do not have the feature for holding the thrust bearing?
A work around is to use an outside race captured roller with the single lip on the inside race then add a roller guide ring between the inner race and the engine sprocket. An NUP or NH bearing type

#701154 - 07/08/17 11:02 pm Re: BSA A65 main bearing question (DS) [Re: Dana_twin]  
Joined: Jan 2014
Posts: 3,324
NickL Online content
BritBike Forum member
NickL  Online Content
BritBike Forum member

Joined: Jan 2014
Posts: 3,324
Aus
The crank is different dimensionaly so fitting a roller race will involve making up spacers/shims to centre the crank in the cases and have a thrust surface on the timing side.
Problem with the NUP style bearings is they are only available as metric sizes so mean either machining the cases or the bearing.
For a street bike just fit another ball race, they are good for at least 30k miles. Save yourself all the work.



#701456 - 07/11/17 2:59 pm Re: BSA A65 main bearing question (DS) [Re: NickL]  
Joined: May 2013
Posts: 4,533
Allan Gill Offline
Allan Gill  Offline



Joined: May 2013
Posts: 4,533
Rotherham - S. Yorkshire
Originally Posted by NickL
The crank is different dimensionaly so fitting a roller race will involve making up spacers/shims to centre the crank in the cases and have a thrust surface on the timing side.
Problem with the NUP style bearings is they are only available as metric sizes so mean either machining the cases or the bearing.
For a street bike just fit another ball race, they are good for at least 30k miles. Save yourself all the work.


Completely agree, I reverted from the roller to the ball quite happily on my 68', and will do this again too.


beerchug

Moderated by  Allan Gill, Jon W. Whitley 


Home | Sponsors | Newsletter | Regalia | Calendar | Bike Project | BritBike Museum | Spiders Cartoons | "OLD" BritBike Forum | DVD- Manuals & Parts books | BritBike Stickers & Decals
Upgrade to: Premium Membership | Premium Life Membership | Vendor Membership | Site Sponsor Membership
UBB.threads™ PHP Forum Software 7.6.0
Page Time: 1.415s Queries: 15 (0.055s) Memory: 0.8099 MB (Peak: 0.9593 MB) Zlib disabled. Server Time: 2017-11-24 21:57:54 UTC