Classic British SparesKlempf British PartsBaxter CycleBritBike Sponsor SteadfastCyclesSRM EngineeringLucas Classic MotorcycleHepolite PistonsIndustrial tec supply

Upgrade your membership to: Premium Membership | Gold Membership | Life Membership | Vendor Membership | Site Sponsor Membership
Welcome to BritBike Forum!
Britbike forum logo
Member Spotlight
Grandad
Grandad
The Crypt - South East England
Posts: 1,117
Joined: February 2008
ShoutChat
Comment Guidelines: Do post respectful and insightful comments. Don't flame, hate, spam.
Search eBay for motorcycle parts in following countries
Australia, Canada, France, Holland, Italy, United Kingdom, USA
Previous Thread
Next Thread
Print Thread
Joined: Aug 2001
Posts: 5,474
Likes: 47
Mark Z Offline OP
Britbike forum member
OP Offline
Britbike forum member
Joined: Aug 2001
Posts: 5,474
Likes: 47
In my thread on "A65 Forensics", I discovered a difference in rocker assemblies between this engine, my bitsa engine, the factory Spares manual, and comments from... it was either Gavin or Kommando.

The difference involves whether the last flat washer (with a smaller id) goes inboard or outboard of the rightmost stanchion.

As I hope you can see in the photo, with the shoulder of the rocker shaft butted right up against the rightmost stanchion, the oil grooves and holes in the rocker shaft align exactly with the oil holes in the left and center stanchions (which are centered in the stanchions left-to-right). With that small diameter washer on the shaft, inside the rightmost stanchion, the oil grooves and holes in the rocker shaft DO NOT line up exactly with the oil holes in the stanchions.

This tells me that, if there is to be a thrust washer inside the rocker stanchion (which there should be, to keep the thackery washer from gouging the aluminum), it must be of large enough i.d. to slide over the shoulder on the shaft.

This means that: 1. My bitsa is assembled correctly, and 2. I'm missing two thrust washers for this engine. A fourth thrust washer for each shaft is also missing from the picture in the factory Spares manual, and that I cannot explain.

[Linked Image from i.postimg.cc]


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Support Your #1 BritBike Forum!

Check out British motorcycles for sale: British Motorcycles on e-Bay UK, British motorcycles on e-Bay North America
Joined: Jan 2014
Posts: 1,206
Likes: 81
N
Britbike forum member
Offline
Britbike forum member
N
Joined: Jan 2014
Posts: 1,206
Likes: 81
The washer goes inboard, it's to stop you overdoing the nut and pulling the shaft through the alley.
That washer has the thackery up against it. The thin thrusts go on the centre, both sides and on the
inboard side on the left, where they also have a thackary .

So in your picture left to right,,,,, thin thrust, thackery, rocker, thin thrust,thin thrust, rocker, thackery, small dia washer, outer washer , Nut.
The oil holes can stand some misalignment as only a poofteenth is really required.

1 member likes this: gavin eisler
Joined: Aug 2001
Posts: 5,474
Likes: 47
Mark Z Offline OP
Britbike forum member
OP Offline
Britbike forum member
Joined: Aug 2001
Posts: 5,474
Likes: 47
Ok, it offends my sense of symmetry and shakes my faith in what I've always considered to be a very clever design for routing oil to the rockers, but I see what you mean Nick; that isn't much of a shoulder on the shaft to provide a stop against the aluminum stanchion.

So I will assemble it as you say, and as the Spares manual implies. Pumping oil through the head and watching it ooze out from the exhaust rockers (as I always do anyway) will give me adequate peace of mind.

I may also add another thin flat washer outside the stanchion, as I don't like the idea of having a split washer against the aluminum.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.

Moderated by  Allan G, Jon W. Whitley 

Link Copied to Clipboard
Job CycleBritish Cycle SupplyMorries PlaceKlempf British PartsPodtronicVintage MagazineBSA Unit SinglesBritBike SponsorBritish Tools & FastenersBritBike SponsorBritBike Sponsor






© 1996-2021 britbike.com
Powered by UBB.threads™ PHP Forum Software 7.7.5