Tacho

SMBH · Post by **SMBH** » Tue Sep 15, 2015 2:16 pm

Modelman here's a link to speedo repair it's for the CB450 speedo but will give you some idea has to how to go about it, I did a restro on A cb72/77 one with no problems just take care getting the bezal off they are so easy to damage. Any problems just post.

http://www.oldjapanesebikes.com/gt750/i ... Repair.pdf

modelman · Post by **modelman** » Wed Sep 16, 2015 5:55 am

Thanks for suggestions, pulled it apart & I must say I found lifting the surround-seam quite difficult, that old brass is hard, & was like new, so obviously never been apart before.
The 'innards' were squeaky clean but VERY sluggish, & whatever lubricant in there had solidified & gummed it all up.
No apparent damage & both coil-springs were intact, everything was liberally blasted with carb-cleaner which didn't seem to make much difference, ( I have no idea how it SHOULD be )
Even the tumblers were clagged up so they were given the treatment as well, & since its had a total re-build, I thought I might as well zero it.
Ran both up on a hand-drill & they seemed to operate OK. Then I tried cleaning the dial face,
Oh dear, I made it worse, the surface has become like 1000 grit sandpaper, which I presume is due to lots of heat & sun, ( just like the UK ) & my feeble attempts made it worse!

So, dear friends, any suggestions? Does anyone make dial decals?

If not, then I'll draw one up on CAD & print it on vinyl, mines a 'murky-grey, were they supposed to be black?

SMBH · Post by **SMBH** » Wed Sep 16, 2015 6:34 am

Ho dear you should have only used a miled soapy water on the dial nothing else, now a guy in the US do's a very nice stick on repro dials I purchased on for a speedo I did up he sometimes sells them on EBay.

I can not find his details at the moment try a search on this forum you may come up with something or someone may help you with his details.

G-Man · Post by **G-Man** » Wed Sep 16, 2015 6:43 am

Modelman

Yep - all of the solvent leaves the oil and grease. You have to be careful with any solvent cleaner in there as it will attach the dial as you have seen. I usually use a sponge and soapy water on the dial.

You can also take the numbers off the odometer dial with solvent.....

Dial decals are available. SaraLS used one on her SuperHawk restoration. I'm a bit scepical about them so I use the best original dials I can find.

G

modelman wrote:Thanks for suggestions, pulled it apart & I must say I found lifting the surround-seam quite difficult, that old brass is hard, & was like new, so obviously never been apart before.
The 'innards' were squeaky clean but VERY sluggish, & whatever lubricant in there had solidified & gummed it all up.
No apparent damage & both coil-springs were intact, everything was liberally blasted with carb-cleaner which didn't seem to make much difference, ( I have no idea how it SHOULD be )
Even the tumblers were clagged up so they were given the treatment as well, & since its had a total re-build, I thought I might as well zero it.
Ran both up on a hand-drill & they seemed to operate OK. Then I tried cleaning the dial face,
Oh dear, I made it worse, the surface has become like 1000 grit sandpaper, which I presume is due to lots of heat & sun, ( just like the UK ) & my feeble attempts made it worse!

So, dear friends, any suggestions? Does anyone make dial decals?

If not, then I'll draw one up on CAD & print it on vinyl, mines a 'murky-grey, were they supposed to be black?

PhilD · Post by **PhilD** » Wed Sep 16, 2015 6:44 am

Glad to hear nothing was broken inside your unit. Gumming up of the works with dried out lubricant seems to be the commonest cause of problems with these, mine was the same but unlike yours the needle would not move at all until the drive mechanism was freed up. Replacement dial faces are available on eBay and I obtained one after some delay from Ronnie@jenningservice.com but I note Will Barber of the VJMC advertises a reproduction service and may be quicker as is UK based. Several forum members have made their own replacements and if you search the forum you can find links to downloadable jpg files for odometer number images.
PhilD

PhilD · Post by **PhilD** » Wed Sep 16, 2015 6:52 am

Sorry missed out the link for Will Barber. He's at barbers@rowanhouse1.demon.co.uk
PhilD

modelman · Post by **modelman** » Wed Sep 16, 2015 11:21 am

I'm learning from my mistakes, just drew this up on paper for a trial-run, I think it will be OK, not good enough for you experts out there, but good enough for me.
Too late now so I'll pop down the road tomorrow & get a 5 foot strip of them run off printed on matt vinyl.
Not bothered with the various cut-outs, as I'll stick it on first, then remove the openings with a scalpel.