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Early S2 Speedo/Tacho damping needed.
Posted: Sun Jan 08, 2023 1:01 pm
by Baff1960
Hi there.
Noticed that my 71 S2 NOS speedo and tacho lacking damping on longer ride outs. Any advice to fix without having to unmould the retaining lip on the plastic covers would be appreciated.
Cheers Alan
Re: Early S2 Speedo/Tacho damping needed.
Posted: Sun Jan 08, 2023 4:30 pm
by Triple Parts
You are going to have to take it apart, you may find this useful...
viewtopic.php?t=20226
If you don't fancy it, Alan Smith does them...
viewtopic.php?t=18345
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Re: Early S2 Speedo/Tacho damping needed.
Posted: Mon Jan 23, 2023 7:08 pm
by Baff1960
Hi Tony.
Thanks for that. Saw you article in the club mag detailing the disassembly/assembly of the plastic shrouds. I might end up going there but still mulling it over. Will chat to Alan first to pin point the damping solution.
Cheers Alan
Re: Early S2 Speedo/Tacho damping needed.
Posted: Tue Jan 24, 2023 11:25 am
by Fast Phil
Have you tried greasing the cable?
Re: Early S2 Speedo/Tacho damping needed.
Posted: Tue Jan 24, 2023 1:13 pm
by mraxl
The needle rides in a cavity that is filled with a grease. If that grease has seeped out, the result is rapid needle bounce.
It can only be corrected with total disassembly and cavity fill with proper grease.
Re: Early S2 Speedo/Tacho damping needed.
Posted: Tue Jan 24, 2023 4:42 pm
by Triple Parts
Is it not damping oil Dale? I thought it is quite thin, so when you leave the clock on its side or upside down it can leak out, but I have never stripped one down that far.
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Re: Early S2 Speedo/Tacho damping needed.
Posted: Tue Jan 24, 2023 6:27 pm
by mraxl
It is a grease but viscosity and amount is critical.
Re: Early S2 Speedo/Tacho damping needed.
Posted: Tue Jan 24, 2023 9:45 pm
by Triple Parts
mraxl wrote: ↑Tue Jan 24, 2023 6:27 pm
It is a grease but viscosity and amount is critical.
Learn something every day
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Re: Early S2 Speedo/Tacho damping needed.
Posted: Wed Jan 25, 2023 10:51 am
by David Riley
I had a similar problem a few years ago and found a solution on another forum.
You need to get some silicone model car diff oil (30000 cst viscosity) and basically you strip down the speedo/tac and refill the damping chamber with the oil.
I thinK i used a small syringe.
Its a bit fiddly but can be done.
Must be 10 years ago and the needles are still spot on with no flutter.
Got mine on the interent from core-rc.com.
Regards
Dave.

Re: Early S2 Speedo/Tacho damping needed.
Posted: Sat Jan 28, 2023 7:42 pm
by Baff1960
Hi.
Thanks for the info. I have an old Tacho I've taken apart and that's good for a test bed so will experiment on it.
Regards Alan
Re: Early S2 Speedo/Tacho damping needed.
Posted: Mon Jan 30, 2023 6:48 am
by Pierrot974
Hi
A friend of me use this silicone grease :

Re: Early S2 Speedo/Tacho damping needed.
Posted: Sun Feb 05, 2023 11:18 am
by Baff1960
Hi.
Had a look at my spare Tacho which has almost no damping at all. Examined what was left of the damper pot contents. Looks to be thick oil. Have acquired some CORE-RC 30000 oil which is very viscos. Will
test it soon as the weather improves.
Alan
Re: Early S2 Speedo/Tacho damping needed.
Posted: Sun Feb 05, 2023 12:42 pm
by Triple Parts
Maybe test it with a drill?
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Re: Early S2 Speedo/Tacho damping needed.
Posted: Sun Feb 05, 2023 6:04 pm
by Klawsuc
Run the drill in reverse. Phil