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by Mal Marsden - 06/16/22 7:00 pm
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Allan G, BrizzoBrit, Gordon Gray, Mark Z
Total Likes: 6
Original Post (Thread Starter)
#871313 02/06/2022 6:28 PM
by Gary E
Gary E
Why the casting nub? This one has wear on the high side.

[Linked Image from]
Liked Replies
#871541 Feb 8th a 10:33 PM
by NickL
They put the 'nub' on the plate to get some bunch of idiots in the next century
to spend inordinate lengths of time discussing it and the whys and wherefores
of it's totally useless purpose.
2 members like this
#871381 Feb 7th a 11:25 AM
by Mike Baker
Mike Baker
I've heard it said that the nub is clocked to the rear and used to assist prying the cover off. Prybar between the sprocket and nub?
1 member likes this
#871389 Feb 7th a 02:20 PM
by Gary E
Gary E
Originally Posted by Allan G
Originally Posted by Gary E
Originally Posted by Gordo in Comox
1968 A65 Parts book plate 5 Item #1 68-3194 Felt Washer. Goes outboard of the nut that holds the Sprocket on.

Shown in 1966 book but not in 1965 book. Only 3 books I have to check.


Thanks for the info. Yes. The felt washer wasn't utilized until the 1966 model year. The cover plate with the nub I posted is off of a '65 engine. No felt washer for that year.

No guarantee its the original cover.

Well yes, always. When I disassembled the engine there was no felt washer. Same with the other '65 engine here.
1 member likes this
#871501 Feb 8th a 02:57 PM
by Lannis
Maybe we should try to collectively think about who might actually KNOW what it was for.... 60s BSA worker, repro parts designer, etc rather than just us guessing whether it might be a perch for a very small oily canary or some sort of biker sex toy.....?

I don't have any ideas, though...

1 member likes this
#871785 Feb 11th a 07:09 AM
by Mark Z
Mark Z
The nub being there as an aid to prying the cover loose seems to be the most logical explanation.
1 member likes this
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