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Howard Inough
Howard Inough
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Samsmc1 Offline OP
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Did Triumph provide service sheets for their pre units like BSA did?
I'm not finding any and I need to find out why I have two magneto's here with auto advance that should be fixed.
These don't just have blocked off advance cable holes in them.
Cam Rings were not the advancing / rotating type - they are fixed; indicating that these mags came this way.
This is contrary to the Lucas Master Parts catalog for the years 1936 thru 1957.
If I had just one mag like this, I would assume someone probably changed some parts around - having two makes me wonder whats going on.
I've been informed in another tweet on this forum that Triumph did this, but the Triumph parts book doesn't show it being optional.
Thanks
Sam

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Sam,
I looked at a 1948 instruction manual and it says the magneto used a automatic advance system.
Scott

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...hello; is not clearly what part do you need to fix.
The auto advance unit is kind of a star with the weights. I fixed mine couple of times some 20 years ago. I made that star and the hollow bolt.
You only need one part fixed and the other with movement so the weights can advance.
I had a BTH not a Lucas but is the same. Then I lost it in the public transport! and bought a Hunt magneto.
In the older motorcycles BTH was fitted.

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Maybe expand your search to period magazine test articles as well. Some of them had very detailed descriptions of equipment supplied on test bikes. American mags weren't all that until perhaps the early 60s but the English magazines were very good during the 50's.
Cheers,
Bill


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1974 Commando
1985 Honda Nighthawk 650
1957 Thunderbird/T110 "Black Tiger"
Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
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Bill
I've read and reread what you have sent to me in the last few weeks about the mags.
I'm not questioning what you stated - these two mags tagged as 42344's with obvious automatic advances convinced me that Lucas sent them out this way.
Problem is back to the documentation question again - I need proof and the '57 Triumph parts book and the Lucas Master Catalog say different.
I'm finding it strange that I'm not seeing any Triumph service sheets prior to the unit construction 650's in '63.
I need a good cam ring for a CCW mag with manual advance.
Any ideas who may have a good used one>
Thanks
Sam

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I think part of the appeal of pre units is the amount of sleuth work necessary to get valid information. It's something I have enjoyed doing over the years. When I began this trip, there was no such thing as the internet and not even a library to go to for this info. Most of the info I got came about through networking with fellow enthusiasts. For example, when I built a '59 Bonneville, I knew several others building them simultaneously. It was me, Cliff Rushworth, Buzz Walneck, Gale Searing, Tom Horn, and someone I can't recall at the moment. We shared info and parts. It was great fun I have to admit.
What I find most interesting is the no two bikes came out identical; all had significant differences between them and we all thought we had nailed it.
I never showed that bike although I had several invitations to do so. The fellow I sold it to showed it at Del Mar and won the Jimmy Phillips award for it for best Triumph of Del Mar that year. It also won best British Bike and my T110 came in second.
But things have changed. I think the judges today are better informed, or at least they have access to information not available to past judges.
So, I would suggest you do your due diligence on the issue and if after some time you never get any satisfactory answers or evidence that perhaps the judges at shows won't either and you can mark that one up as a win.
I think it's painfully obvious that Triumph themselves often provided faulty info on their own products as it seems as though they just couldn't keep up with it all.
So, with regards to your magneto's original configuration I would go with what you have. I don't have any reason to suspect that T110's didn't come with both manual and auto advance and that a significant amount of them came with the Wader mag as well.
Also, I would think that there must be a NOS cam ring around somewhere. If you come up short, I would contact one of the magneto specialists. They may have hoarded the majority of NOS parts for these mags. A used one will likely be worn and cause a timing variation between left and right sides. This can be addressed with some stone work.
Cheers,
Bill


Last edited by HawaiianTiger; 01/21/20 7:35 pm.

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1974 Commando
1985 Honda Nighthawk 650
1957 Thunderbird/T110 "Black Tiger"
Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
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Samsmc1- Dave Gaylin in the TR6 and T120 restoration book states that a lot of the eastern USA delivered bikes had auto advance when they left factory. I have also had at least 5 TR6s and T110s with correct dated auto mags still on them.


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