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May 8th, 2022
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Well...

I've looked at this a bunch of times, and I'm stumped. I had to order a new taillamp assembly including a 68-6835 because the old one was all hacked up. I got a new L679 taillamp assembly, as well as 68-6834.

I can't figure out how to assemble this thing, and the manual is not helping. I can't figure out how to attach the rubber assembly to the holder. If I attach the 68-6835 to the L679, the holes in the taillamp mounting assembly are hidden by the assembly - the old assembly didn't have any holes in the rubber gasket. I'm missing something simple, but I can't figure it out.

Any help is appreciated.

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Any chance that the plate shown in the link below (82-6849) is supposed to go between the aluminium base and the rubber thing ?

https://www.thebonnevilleshop.com/w..._1967_70__94297.1458057550.1280.1280.jpg


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Yep - I've got that part - the rubber part blocks the holes to attach it to the aluminum mount on the fender.

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[Linked Image from bsaunitsingles.com]

Last edited by quinten; 04/23/22 4:58 pm.
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Is this an original aluminum part, or aftermarket? I've not seen those threaded bosses on an original one.
Normally, the area is flat and the holes are threaded.

Anyway, there should be two small hex-head bolts that mount the black steel plate and the rubber piece to the silver steel bulb holder.
They go in from the back side of the black steel plate through the two holes that do not have the "dimples".

Then, you flex the rubber away from the black plate to mount the black plate to the aluminum casting with three screws.
You do not need to make holes in the rubber to do this. The heads of the screws get recessed into the three dimpled areas.

Finally, the red lens gets mounted into the two holes in the silver bulb holder.

At least, that's the way the original ones are assembled.

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Originally Posted by Irish Swede
Then, you flex the rubber away from the black plate to mount the black plate to the aluminum casting with three screws.
You do not need to make holes in the rubber to do this. The heads of the screws get recessed into the three dimpled areas.
This is the part that I was missing. It was so freaking obvious, I can't believe I missed it...

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Originally Posted by Irish Swede
Is this an original aluminum part, or aftermarket? I've not seen those threaded bosses on an original one.
Normally, the area is flat and the holes are threaded.

I’ve got a couple of those pattern rear light units, one for the D14s, no cut away there so should fit fine. And an A65 one, they don’t fit whilst picking up the original mounting holes (the cutaway portion is in the wrong spot). They may have improved them since… I did buy mine years ago.


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Originally Posted by jakejoseph
Yep - I've got that part - the rubber part blocks the holes to attach it to the aluminum mount on the fender.

I just replaced that part on my A65 last week. Bought a new one from one of our vendors; the old one was cracked (just like the fender) after 53 years of vibrating. Took a few minutes to realize that you had to pull back the rubber to take it apart, but after that it went OK.

You have to do a bit of bending and warping to get the mount for the lens to line up once you take it apart, since they're light sheet metal.

Lannis


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The original black sheet metal parts generally line up with the aluminum just fine, as they were made to do.

Are the repros almost "paper-thin?"

Also: the curves of the bottom of the steel plates differ between BSA and Triumph ones, because BSA fenders have a more deeply curved cross-section
than do Triumph ones. Many of them being sold on EBAY are mis-labeled because of this.

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The repro I got fits great - works for my BSA, proper curve, didn't have to do any bending. Same gauge as the old one. it was pricey, but it did fit.


Moderated by  Allan G, Jon W. Whitley 

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