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#288163 - 12/10/09 12:41 am Smiths 1302/04 tach gauge?  
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Goldstardiver Offline
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California USA
Can anyone tell me what the Smiths chronometric 1302/04 Tach gauge came on? i have one that I was rebuilding for my 1961 BSA A10 however Im not sure if it will work?


1958 BSA A10 Super Rocket
1960 BSA A10 Spitfire Scrambler
1961 BSA RGS 1AB
1961 BSA DBD34 Gold Star Clubmans
1969 BSA A75 Rocket III MkI
1975 Triumph T160 Trident
BSA Gold Star eBay items

BSA Gold Star forum This board is dedicated to BSA Gold Star motorcycles.

#288178 - 12/10/09 2:21 am Re: Smiths 1302/04 tach gauge? [Re: Goldstardiver]  
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Gordo in Comox Offline
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Comox BC Canada
I found a Japanese site listing speedos and tachs. They list the 1302/04 as a 0-8000 rpm, 3:1 ratio and anticlockwise drive unit. You be the judge.

Gordo

(PS my mistake- it would be a clockwise rotation as I later discovered)

Last edited by Gordo in Comox; 12/13/09 3:51 am.

Without frequent roadside repairs there is no fun in riding!
#288414 - 12/11/09 3:52 pm Re: Smiths 1302/04 tach gauge? [Re: Gordo in Comox]  
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Crampoid Offline
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From the details given by Gordo I believe your tach is for a late A10 with the drive from the oil pump, and not from the usual box on the timing cover driven by the mag. I had one that came with a load of BSA single stuff, for years I thought it was duff until I tried turning the drive anticlock.

#288566 - 12/12/09 2:47 pm Re: Smiths 1302/04 tach gauge? [Re: Crampoid]  
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Bodger Offline
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Anti clock looking at the cable/back side or the face?

This is the chronometric right?

Does it matter if it's turned the wrong direction..that is, does it break it?

Rask Cycle has a chart for the magnetic speedo and tachs used on the 60's and 70's, annoyingly not for the earlier chronometrics. Bacon also doesn't list the particulars for the speedos and tachs either, grrrrr.

Gordo: could you post the link to the japanese site please? Thanks very much.

In Aus land you lot down there have KTT Services, who still makes parts, gearboxes and original instruments.

Has anyone experienced the Indian tachs sold on eBay?

I've got one of these as well, origin I know not, maybe my GS DBD 1957..can't remember.

#288585 - 12/12/09 6:25 pm Re: Smiths 1302/04 tach gauge? [Re: Bodger]  
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Gordo in Comox Offline
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The link

www.lcv.ne.jp/%7Ecrucify/smiths/smiths_2.htm

Gordo


Without frequent roadside repairs there is no fun in riding!
#288690 - 12/13/09 3:03 am Re: Smiths 1302/04 tach gauge? [Re: Gordo in Comox]  
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johnnie690 Offline
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montreal
Hi guys I've just spent some time checking 2 different "SMITHS"
MotorCycle Equipment lists that I have and...
1302/04 is listed as 0-8000RPM with a 3 to 1 ratio and Clockwise rotation.,so it wouldn't work for Goldies or A10's as the Goldie used RC83 or RC1302/00 which are listed as 0-8000RPM with a 2 to 1 ratio and Clockwise rotation,the RC83 is also listed for the early A10(driven by gearbox 70549/4 on the timing cover),the later A10(driven directly off the oil pump) used RC1303/00,0-8000RPM with 2 to 1 ratio anticlockwise rotation.
I also found that the early A65's with chrono instr.used the RC1302/04 on the A65R.Also the later A65's using magnetics(RSM3003-06) the tach is 3 to 1 clockwise rotation ,0-10,000RPM
So ,that's what I've found ,I nearly wore out the pages flipping back and forth between the 2 manuals.
Oh ,ya the direction of rotation is the cable direction looking at the face of instrument.All for now.

#288693 - 12/13/09 3:49 am Re: Smiths 1302/04 tach gauge? [Re: johnnie690]  
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Gordo in Comox Offline
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My mistake. Looking back at the site I mentioned above it seems I misused the "arrow" that pointed to the direction of rotation notation. They must be pointing to the direction notation above and not from the direction notation below as I read.

That would mean the unit in question would be a clockwise rotation as johnnie690 states above.

Gordo


Without frequent roadside repairs there is no fun in riding!
#288742 - 12/13/09 12:49 pm Re: Smiths 1302/04 tach gauge? [Re: johnnie690]  
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Bodger Offline
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Santa Barbara, Cal.
Johhnie, these lists, paper or online?

Anybody have them online as a .pdf or .jpegs?

Thanks Gordo, the japanese site is very informative and has the ATRC conical tachs as well. KTT Services still make these, they are the ones in the rubber isolation mounting on Manxs, G50, japanese factory racers...I have seen these mounts used with standard chronometrics as well.

The mounting I've seen available at TGA in the UK..a sponsor here I think.

#288743 - 12/13/09 1:00 pm Re: Smiths 1302/04 tach gauge? [Re: Bodger]  
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Bodger Offline
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Santa Barbara, Cal.
Notice that Alan's original question isn't quite answered, and neither does Bacon have any lists or answers as to what model, what tach and speedo. That's pretty interesting as we have the carb numbers all over the place.

Maybe the lists that Johnnie has is indexed that way...

Here's the Rask Cycle list main page, brand name list at the right:
http://www.raskcycle.com/techtip/p24.html

It doesn't list the A65R and doesn't show the chronometrics at all...nothing earlier than 1964. I trust Johnnie's lists on this.
Hope it's online :>

#288777 - 12/13/09 4:28 pm Re: Smiths 1302/04 tach gauge? [Re: Bodger]  
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montreal
Bodger,these are hard copy ,photocopies of original "SMITHS" lists .I have 2 sets one is from 1954 to 1958 and the other is 1960 to 1970,so the second one cover chrono and magnetics.That is why I showed that the later A65 used RSM3003/06 which is 3 to 1 clockwise rotation ,the same as the 1302/04 .
In fact SMITHS had only listed 2 chronos with 3 to 1 ratio ,one CW rotation and the other CCW rotation ,so you can see that the 3 to 1 (RC1302/04) has a very specfic applicability.There are about 40 pages printed both sides.I have never seen them on line ,but they could be there .

#288951 - 12/14/09 4:25 pm Re: Smiths 1302/04 tach gauge? [Re: johnnie690]  
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ca7a Offline
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Johnnie 690; many thanks for posting your research. It's going to be helpful for me and, I'd guess, for lots of others here on the forum!

David

#289780 - 12/19/09 10:52 am Re: Smiths 1302/04 tach gauge? [Re: johnnie690]  
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Bodger Offline
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Santa Barbara, Cal.
Johnnie, I looked at my speedo and tach, and could you look up what they were from and the ratio and direction please?
Chronometrics...Tach is CW face, 0-8000 rpm and labeled 'RC 83'.

The Speedo is cw face, 0-120mph, it says '1450' and in larger letters 'S.546/3'
and it rattles. And had 7000 miles on it.

Any numbers like that in your lists?

Thank, Ken

#289838 - 12/19/09 3:42 pm Re: Smiths 1302/04 tach gauge? [Re: Bodger]  
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johnnie690 Offline
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montreal
Hi Bodger,
The RC 83 is 2 to 1 CW rotation used on all Goldstar and the early A10 driven off the mag gear.
The S546/3 is used on the Goldstar from 1954 to 1959 but will work on all years after that.
Also used on the 1954 to 1958 A10.
I don't have time right now to check a bike for the speedo ratio and direction of rotation ,and the Smiths papers don't give it ,I guess the ratios differ with what method the instr. is being driven,i.e gearbox(BSA) or the angle gearbox on rear wheel,so they don't give this info .to vast I guess.
But what you have will be good for a Goldie if that is what you are working on .

#293601 - 01/12/10 7:24 am Re: Smiths 1302/04 tach gauge? [Re: johnnie690]  
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Bodger Offline
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Santa Barbara, Cal.
Well, here's the missing links for Smith's tachs and speedos for which make and model.


This thread:
http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=293600&#Post293600
'some Vintage parts books and manuals' from Dennis B, leads to this link:

Vintage Parts Books and Manuals

These are jpeg scans of the books, you will have to bookmark, look at, and download each book and each page and store it however you like. There are several other lists and books from Vintage Age bikes and parts, but the Smith's booklets cover most of the
Chronometric speedo, tach, and gearboxesitems from the 50's.

The later 60's
Magnetic speedos and tachs are listed at the Rask Cycle website:
http://www.raskcycle.com/techtip/p24.html

Last edited by Bodger; 01/12/10 7:31 am.

Moderated by  Rich B 


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