SOHC.co.uk Forums > CB500/550

Clock decal overhaul

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AshimotoK0:

--- Quote from: Lobo on November 10, 2014, 01:46:13 AM ---Hi Peter..

Whilst you're here (!) can you perhaps pen a few words on how to fill / top up the damper pots in these instruments? My 750 speedo fluctuates +/- 5mph .... assume not normal, even for 1972.

Cheers,
Simon.

--- End quote ---

Yes I would like to hear from Peter too on this but I have asked before here on the USA site:

http://forums.sohc4.net/index.php?topic=78890.0

Lecram has a video of before and after but don't think specifics of how to do it.

I have a litre of silicone oil but need to get it's viscosity measured.

Cheers ...Ash

simonster:
Having just opened the tacho and found it in worse internal condition to the speedo. With some metal decay around the inner base. The working mechanism has discolouration on the load spring ( don't know the correct term ) and turning the needle manually does cause it to unload back to its original position most of the time... However it occasionally sticks and I can feel some resistance on  the needle shaft. Is this serviceable? Can I lubricate? I know there is some mention of using silicone oil in this thread but no definitive answer. Will spray quick dry solvent help in the first instance to clean up before lube. Cheers


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kent400:
The chances are that some rust flakes for the inside of the base have been attracted to the internal magnet that's connected to the drive and are jamming the aluminum magnet cover. If that's the case you might be able to remove two tiny screws on each side of the frame and lift off a small aluminum shield to gain some access to the magnet. Beyond that you have to grind off the barbs that secure the front of the frame to the remainder. It then possible to remove the magnet cover but this is a tricky business, especially re-fitting.

As for the dampers, differant types on the smaller gauges the front of the gauge has to come off and the silicone grease replaced. Again a tricky business. Several differant types of dampers one the larger gauges, one you can remove the end cap to refill, great care required. The other type a hole is drilled in the damper to refill. A wavering needle isn't always due to lack of damper fluid, the drive cable can be the cause. A easy test for damping is spin the drive end, if the needle drops instantly to zero there no damping effect. The damping effect does vary a bit in so far how quickly the needle drops to zero but it should not drop instantly when the drive ceases. Hope that helps

kent400:
On forgot to mention if the tacho mechanism is beyond repair I may well have one in the spares box.

simonster:
Thanks for that advice. There is definite damping on the needle because when it does return there is that nice millisecond delay before smoothly unloads to zero. This is how it looks if you could advise on the type of mechanism I have. Cheers



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