BritBike Forum logo
BritBike Sponsor BritBike Sponsor BritBike Sponsor
BritBike Sponsor

BritBike Sponsor

BritBike Sponsor
BritBike Sponsor BritBike Sponsor BritBike Sponsor
JRC Engineering dealers
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
Member Spotlight
Go2fer
Go2fer
Netherlands
Posts: 55
Joined: June 2011
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
39 registered members (Alan_nc), 197 guests, and 218 spiders.
Key: Admin, Global Mod, Mod
Newest Members
JoeBrown, Bart223, Duckster, IDG1, pemdoc65
10173 Registered Users
Top Posters(30 Days)
Lannis 93
reverb 82
Stuart 77
NickL 67
koan58 61
Popular Topics(Views)
551,048 mail-order LSR
Forum Statistics
Forums34
Topics66,569
Posts645,348
Members10,173
Most Online3,995
Feb 13th, 2017
Like BritBike.com on Facebook

Previous Thread
Next Thread
Print Thread
Rate Thread
BSA A65 main bearing question (DS) #701126
07/08/17 5:32 pm
07/08/17 5:32 pm
Joined: Aug 2012
Posts: 591
Oregon
D
Dana_twin Offline OP
BritBike Forum member
Dana_twin  Offline OP
BritBike Forum member
D
Joined: Aug 2012
Posts: 591
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 BSA Forum and our favorite sponsors

Check out BSA on e-bay: BSA Parts in UK, BSA Motorcycles in UK, BSA Parts in North America, BSA Motorcycles in North America

 
 
Re: BSA A65 main bearing question (DS) [Re: Dana_twin] #701153
07/08/17 10:51 pm
07/08/17 10:51 pm
Joined: Jan 2004
Posts: 3,646
ca, us
D
DMadigan Offline
BritBike Forum member
DMadigan  Offline
BritBike Forum member
D
Joined: Jan 2004
Posts: 3,646
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

Re: BSA A65 main bearing question (DS) [Re: NickL] #701456
07/11/17 2:59 pm
07/11/17 2:59 pm
Joined: May 2013
Posts: 4,765
Rotherham - S. Yorkshire
Allan Gill Offline

BritBike Forum member
Allan Gill  Offline

BritBike Forum member
Joined: May 2013
Posts: 4,765
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
Powered by UBB.threads™ PHP Forum Software 7.6.1.1
(Release build 20180111)
Page Time: 0.055s Queries: 15 (0.004s) Memory: 0.9952 MB (Peak: 1.1298 MB) Zlib disabled. Server Time: 2018-04-23 01:56:24 UTC