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My 1966 Triumph T100 project came in boxes. I have no idea how the chain guard mounts. It has a slotted mounting tab toward the back that seems to align with a hole in the swing arm but the front has a small hole on the left side at the very front of the chain guard. It corresponds with nothing that I can find. There is no obvious mounting point. The parts book seems to show a bracket but once again there is no mounting point I can find.

Any information would be greatly appreciated.


James In Sherman TX

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Is "the small hole on the left side" near or at the top?

If so, it might be a hole for a rivet that held the front mounting bracket (now missing) in place.

The front bracket would be inside the chain guard and would come down, ending with a slot or hole for adjustment.

That hole would be for a small, right-angle bend bracket that actually mounts the chain guard to a threaded hole in the swing arm.

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Originally Posted by Big_Jim59
but the front has a small hole on the left side at the very front of the chain guard. It corresponds with nothing that I can find. There is no obvious mounting point.
Any information would be greatly appreciated.

This would be a great time to post pics of your chain guard so we can see the issue.


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project
1971 BSA A65 650 - Project
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The front of the chain guard is mounted with an "L" bracket (82-4134) which is mounted to a threaded hole in the swing arm. It is clearly shown in the parts book.

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The mounting hole is on the very front bottom left or outside area. It may be that this chain guard is for a later model. I see where a bracket could be attached to a bolt that is already through the top of the swing arm. I will probably have to make a bracket.

I will try and get pictures.


James In Sherman TX

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Mystery solved. I apologize for asking a question and then leaving and not returning. I got sick with a cold. Imagine having a cold in the middle of COVID. It caused me to miss work. It was a full on sneezing, coughing and runny nose cold. I am better now and I have had a chance to return to the shop.

As for the mounting of the chain guard, I was making a bracket. I was in the process of figuring out the mounting point when I turned the guard upside down and noticed the remains of the original bracket welded to the inside of the guard. It all make sense to me now. The original mounting tab is broken I will just have to fashion a new one.


James In Sherman TX

2000 Moto Guzzi Quota
1966 Triumph T100 Project Under Construction

Moderated by  Jon W. Whitley 

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