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.
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.
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.
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.
Without frequent roadside repairs there is no fun in riding!
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.
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...
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 .
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 .
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.