SOHC.co.uk Forums > CB750
Speedo damping?
AshimotoK0:
I think I have an F1 opened up speedo/tacho somewhere ... I will take a look.
If not kent400 on here (Peter Horton) will probably know.
kent400:
There are a couple of different damper designs used on the speedometer but they can be refilled is exactly the same way. The tachometer may have a different design that has a aluminium cap at the needle end but again can be refilled as Ash described. Where the speedo is concerned the mileage counter needs to be removed by carefully bending back the tabs that securing it to the mechanism frame. Whatever is used to seal the hole in the damper needs to be minimal otherwise it will touch the mileage counter as there is only a couple of millimetres clearance between them. No problem with the tacho of course. None of these have anything that could be described as a seal and leakage usually only take place if the gauges are stored face down.
AshimotoK0:
--- Quote from: kent400 on August 02, 2018, 05:16:16 PM ---There are a couple of different damper designs used on the speedometer but they can be refilled is exactly the same way. The tachometer may have a different design that has a aluminium cap at the needle end but again can be refilled as Ash described. Where the speedo is concerned the mileage counter needs to be removed by carefully bending back the tabs that securing it to the mechanism frame. Whatever is used to seal the hole in the damper needs to be minimal otherwise it will touch the mileage counter as there is only a couple of millimetres clearance between them. No problem with the tacho of course. None of these have anything that could be described as a seal and leakage usually only take place if the gauges are stored face down.
--- End quote ---
Makes you wonder how Honda ship(ped) those parts as spares in the post to people without preventing them being upside down at some point Peter.
kent400:
I think it's only a problem if the gauge is left face down for an extended period. If you have ever seen an original box a gauge is supplied in it's marked with the instruction to store face upwards. What I don't quite understand is why some gauges of the same type loose their damping effect and others of the same age don't. Seiki gauges seem to worse as far as loss of damping is concerned. On the early Seiki ones it's only a question of removing the tiny nut under the needle, withdrawing the centre of the damper to re-fill.
Not so easy on ND ones of course.
Arch stanton:
Hello again.
Can anyone explain to me.
How does the damper work?
It appears to me that there is a metal tank of oil with a continuous shaft running through it.
How can that work?
If the shaft rotated within the tank of oil, while the oil tank remaind stationary. Then i could understand it. Just as i could. If the tank was a solid mass & simply acted as a counter weight. But in that case. What is the purpose of the oil?
Sorry if I'm being a bit dense. But i simply dont get it!
You explanations are eagerly awaited.
Sean.
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