'71 electrical queries

My '71 Roadster has non-original electrics and is missing bits. I would like to bring it back to standard, with indicators and was wondering about the following:

Does the rectifier and flasher unit mount in the same places as the '72/'73 ie on the rear of the frame cross member, rectifier on the left, then the flasher?

Does the assimilator and spring fit via the right rear mounting bolt of the coil bracket?

The timing side mounting bracket of the battery tray doesn't have 2 holes for the accessory socket. According to the wiring diagram it should have had one. It was built Jan '71 and the part number is different to the '72 socket. Are they different as I've only managed to find a '72 type.

I did assume that it would have long stem indicators at the rear with 2 short at the front to allow for the extra width of the headlight. According to Old Britts it should have 4 long ones. Is this correct?

Thanks for all the help,
Graeme

Have you checked on L.A.B. 's sticky tech thread?

komet said:

The timing side mounting bracket of the battery tray doesn't have 2 holes for the accessory socket. According to the wiring diagram it should have had one. It was built Jan '71 and the part number is different to the '72 socket. Are they different as I've only managed to find a '72 type.

Click to expand...

The early models had a different socket that attached to the front air filter plate (you can see it in the '71 brochure photos): http://www.classicbike.biz/Norton/Broch ... mmando.pdf

komet said:

I did assume that it would have long stem indicators at the rear with 2 short at the front to allow for the extra width of the headlight. According to Old Britts it should have 4 long ones. Is this correct?

Click to expand...

Indicators would still have been optional on for '71, and unlikely to have been fitted originally (see brochure). The short/medium* length ones look better at the front.

*(There were at least five different types/lengths of Lucas indicator stem originally, the pattern items available today only appear to be available in two lengths, either medium [which is the one that is now regarded as 'short'] or 'long' stem, both of which have a 'medium' length attachment threaded section)

L.A.B. said:

...the pattern items available today only appear to be available in two lengths, either medium [which is the one that is now regarded as 'short'] or 'long' stem, both of which have a 'medium' length attachment threaded section)

Click to expand...

But the pattern stems are of the wrong diameter AFIK. There are a lot of offers for genunine flasher on ebay but also the genuine items are available in 10mm and 13mm as I was told by someone else but both stems should fit he headlamp shell (7/16" UNF) and the flasher body. A few days ago I was told that the genuine stems are 1/2" diameter with 7/16" UNF thread
Fritz

bad_friday said:

But the pattern stems are of the wrong diameter AFIK. There are a lot of offers for genunine flasher on ebay but also the genuine items are available in 10mm and 13mm as I was told by someone else but both stems should fit he headlamp shell (7/16" UNF) and the flasher body.

Click to expand...

I've never seen either a pattern Lucas, or a modern replacement genuine 'Lucas'-marked (genuine repro :roll: ) L874 unit with a stem that wasn't 7/16 UNF thread.
http://www.holden.co.uk/displayproduct. ... de=010.553

http://www.ebay.co.uk/itm/TRIUMPH-BSA-N ... 0795861%26

bad_friday said:

A few days ago I was told that the genuine stems are 1/2" diameter with 7/16" UNF thread

Click to expand...

Original Lucas stems were about 0.395" with a rolled 7/16" thread (so the threaded section is slightly larger diameter than the plain stem).

I don't recall seeing any stems as large as 1/2" diameter.

L.A.B. said:

Original Lucas stems were about 0.395" with a rolled 7/16" thread (so the threaded section is slightly larger diameter than the plain stem).

I don't recall seeing any stems as large as 1/2" diameter.

Click to expand...

When I tried to buy a single of this http://www.ebay.co.uk/itm/BRAND-NEW-GEN ... AQ:GB:1123, he sent this to me:

Hi there - I note that you have bought 1 long indicator 99-1190L. LUCAS made indicators are very slightly different to the ones made in the 1970's with a slightly wider stem. They are now 13mm instead of 10mm so I just wanted to advise you of this difference before I send it. I do have some earlier 10mm stems seperate if that

Click to expand...

And this is the answer I've got from RGM regarding this matter

Hello Fritz, thankyou for your enquiry, our genuine Lucas indicators have a 1/2" stem and 7/16" diameter thread, best regards, Roger P.S. give or take a little the information you have is correct but even the 10mm had a 7/16 thread

Click to expand...

Fritz

bad_friday said:

When I tried to buy a single of this http://www.ebay.co.uk/itm/BRAND-NEW-GEN ... AQ:GB:1123, he sent this to me:

Hi there - I note that you have bought 1 long indicator 99-1190L. LUCAS made indicators are very slightly different to the ones made in the 1970's with a slightly wider stem. They are now 13mm instead of 10mm so I just wanted to advise you of this difference before I send it. I do have some earlier 10mm stems seperate if that

Click to expand...

And this is the answer I've got from RGM regarding this matter

Hello Fritz, thankyou for your enquiry, our genuine Lucas indicators have a 1/2" stem and 7/16" diameter thread, best regards, Roger P.S. give or take a little the information you have is correct but even the 10mm had a 7/16 thread

Click to expand...

Click to expand...

10mm is (0.3937") and almost exactly the size I gave you = 0.395"

The 'genuine' late Lucas stems I have are approximately 11mm. Perhaps they are as large as 1/2" (12.6mm) or 13mm now, personally I've never yet seen any that size but whatever the stem size is, the thread at the mounting end should be 7/16" UNF and 3/8" UNF the other end.

L.A.B. said:

... personally I've never yet seen any that size...

Click to expand...

I actually have some of this size
Fritz

Thanks for all the info. The bike didn't have indicators originally but traffic's different to 40 years ago so have ordered 2 long and 2 short ones from RGM. Bike has single Amal fitted with cut-down air cleaner, so getting later type accessory socket and plug for $17 from Walridge.

Hello boys,
I'm digging up this old thread as an aid to a brief history question that I need an answer to.
There is a reference a few posts prior to 3/8 threads on one end and 7/16 on the other end.
My question is relative to the "Genuine Replacement" and Pattern knock offs.
Both of these items available new today seem to be offered only with the crimped stem attachment threaded only on the end that would attach to the motorbike.
The older items I have do have a hex nut and threaded attachment at both ends of the stem.
Was there ever a factory adoption of the crimped stem attachment as far as Norton is concerned?
http://i1134.photobucket.com/albums/m60 ... rimmed.jpg

http://i1134.photobucket.com/albums/m60 ... rimmed.jpg

edited to ATTEMPT to fix the pic links but gave up in frustration.
I'll have to go learn this process all over again apparently.

Copy & paste the photo's "IMG code" - L.A.B..




Any ways, thanks for any answers and all the best.

Thanks L.A.B.
tried, tried and tried again.
I am unable to copy the code. Right clicking does not offer the copy option.
I'm still trying. I did read the instructions, just no ticky, no washy, I'm afraid.
It's not permissions related since you made them show up. BTW, borrowed photo's, not mine, no ownership claim to them at all.
Maybe a NoScript complication.
thanks again, still trying.

success, had to highlight, select all, then paste here.
above is the threaded both ends job
this one below is the crimped version.


Does any one know when this change occurred and was it ever used at the Norton factory or specific to any particular other makes or models.

Thanks and all the best.

According to the parts books and period photos, the design change occurred around 1975.

The early Lucas indicator stems were the "nut" type shown in the first photo, however, I think with that design the lamp bodies could often become loose and swivel around on the stem.

I'm not sure what you mean by "crimped" as the later lamp body was retained by an internal nut, the outer end stem thread and lamp body both had corresponding flats to prevent the body rotating.

AntrimMan said:

I am unable to copy the code. Right clicking does not offer the copy option.

Click to expand...

Left clicking the IMG code copies it (it should highlight [yellow?] and show "copied"), then paste as normal.

Hi L.A.B.
the internal nut escaped me, I have not had one opened to inspect, so not crimped at all, my error.
The highlighting and copying is simply not performing as in the past but the work around "select all" is satisfactory for all the use it gets.
Thanks again.

L.A.B. said:

According to the parts books and period photos, the design change occurred around 1975.

The early Lucas indicator stems were the "nut" type shown in the first photo, however, I think with that design the lamp bodies could often become loose and swivel around on the stem.

I'm not sure what you mean by "crimped" as the later lamp body was retained by an internal nut, the outer end stem thread and lamp body both had corresponding flats to prevent the body rotating.

AntrimMan said:

I am unable to copy the code. Right clicking does not offer the copy option.

Click to expand...

Left clicking the IMG code copies it (it should highlight [yellow?] and show "copied"), then paste as normal.

Click to expand...

Just looked at the 1972 and 1974 sales brochures. Both show the stem with internal nut only at the lamp end. That's the type I have on my '72.