SMITHS CHRONOMETRIC on 750 SF1

W

wulfr

Full member
Location
Middle of EU
Hi guys

need again some help from you concerning SMITHS CHRONOMETRIC speedo & rev counter to be mounted on my "new" SF1 (73)!

As you can see on the attached picture, the look great and now that I've bought them, I must use/mount them on the SF1!  :-[ :-[

ANY EXPERIENCES and/or ADVICES from anybody out there would be greatly appreciated!

Thanks in advance,
cheers,

Wulf
 

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Wulf,

Doubt that they will work correctly, Laverda used some quite unique ratios for their clocks!  Lav tachs were alway 3:1, brits used either 2:1 or 4:1.  From the markings on the face you might be able to track the speedo in old Smiths literature and determine the ratio.  Found loads of Smiths info on brit bike sites while surfing the web a couple of days ago.

I have a set just like yours on the Matchless that I've been restoring since I started riding Laverdas... hope to finish it sometime this year. 

If you find they're useless, give up and decide to sell, please let me know!  Would have preferred a 180kmh speedo, though! :D

piet
 
Hi sorry they used the magnetic type on the lavs not the chronometrics. If you can send me the face numbers I can possibly tell you what bike they are from and what ratio the rev counter is also if you need any chronometrics fixed I do this  ;)
                                  Kev
 
troutbishop said:
Hi sorry they used the magnetic type on the lavs not the chronometrics. If you can send me the face numbers I can possibly tell you what bike they are from and what ratio the rev counter is also if you need any chronometrics fixed I do this ;)
Click to expand...

Good thing to know, Kev!

piet
 
Great site, Stefan. Maybe we can use cheap Honda instruments and get them to read correctly.
Does anyone have experience making flex cables. How are the square drives made, are they swaged in a press?  I have tried various methods grinding them but they always end up unravelling.
 
Tippie said:
Great site, Stefan. Maybe we can use cheap Honda instruments and get them to read correctly.
Does anyone have experience making flex cables. How are the square drives made, are they swaged in a press?  I have tried various methods grinding them but they always end up unravelling.
Click to expand...

Tippie,

The ends are heated to red hot and then quickly swaged in a press type of thing.  There are/were also press-on square drives available.

I have experience in making flex drive cables, but no longer have a source for the parts required...

piet
 
Hi wulf the rev counter from  my records should be a 3-1 anticlockwise with no light fitting on the case . I have records from 54 to 58 & from 64 to 72 i cant find the speedo in these records do i assume  its somewhere between 58 & 64 i will see if i can find what it fits  if you have any problems with them give me a shout cheers Kev
 
Hi Kev

thanks a lot so far for your help!

What did you mean with "I do fix chronometrics"?
Could you fix them the way i could use them on my SF1?

Cheers,
Wulf
 
Hi Wulf I repair them but Piet says the rev counter should be a 3-1 it should be ok as long as the rotation is correct and the cable end is right, you should always make sure the inner cable is not too long as it can ruin the drive in the speedo  ;) If you have any problems with your chronometrics give me a shout .
                                      Kev
 
Wulf,

Had it somewhere... don't remember to be honest. ::)  Not sure, but 5:1 rings a bell.

Certainly not the same as the ND clocks from Honda or Kawasaki, which prevents us using them.

If it's any help, the stock ND speedos were driven by 25:9 gears from the front wheel in disc brake form, but, as the clocks were internally the same across the entire range, drum brakes should have similar gearing.  Smiths-equipped GT/S/SF had 22:11 iIrc.  Perhaps Kev can work backwards from there.

piet
 
Hi Wulf,
Laverda ND instruments ratio: 1:3 revcounter, 1:4 speedo
Honda ND Instruments ratio: 1:4 revcounter, 1:4 Speedo
(Max Mahlmeister told me once)

Ciao, Gert
 
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