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The speedo on my 125Sport just stopped working mid ride.

I checked the cable & that's fine, I can spin it by hand and make it work. I am not sure how I can check the speedo transmission unit at the wheel or whether anything can be done with those?

Appreciate any input. Thanks.
 

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Hi Rob,

I've had this kind of problem with my SVS racing Puch. The fault was a worn (in some cases a broken) needle inside magnet cage.

Sorry, but I've never opened the Smith case.

Br
Helmut
 

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Discussion Starter #3
Hey Helmut - Hello! :)

I don't think it could be worn it has only travelled 4000 klms - perhaps broken yes - I don't know about opening it or even if I should try, as I don't know what's inside. Maybe I should pull it down & show it to my local instrument mechanic or if easily available just buy a new one? Dorian???? :) :) :)

Cheers
Rob
 

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Hi Rob.

Having a bit of a nervous breakdown here so i hope this makes sense.

Mileage has very little to do with 125S speedos, it's the vibration that does the damage. The drive unit at the wheel end can also be a problem as they tend to fall apart.

Basicaly just check every bit as it's all suspect. Cables can also seem to work off the bike but not when put back on. This is usualy due to the inner being the wrong length and it 'walking' away from the drive.

The 'Smiths' head units can be repaired by any instument specialist as they were used on so many different machines.

Off to bang my head against a wall......... :jsm:

Dorian.
 

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Discussion Starter #5
Hi Dorian,

Sorry to hear you are in a stressed state :( & Yes, as always your posts make perfect & impeccable sense :)

I guess it might be a plan to change the inner cable first up & then work down to head unit - of course the problem then is how do we know the right length of the inner cable, if the existing one is incorrect?

If you are going to bang your head against a wall, if I may offer some advice (from extensive experience) try and find a soft one :) I am sure it will all work out .........eventually.

Cheers and thanks
Rob
 

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Hi Dorian

As usual your mechanical knowledge astounds me.

As for banging your head against a wall for stress relief ... a much better option is to remove some of the sources of the stress. Something along the lines of sending the Squallo and motore lungo to me in Australia. i'm sure Rob would appreciate the America or the TEL. He might even do a road trip over to collect the bikes in a similar way to what he did for his Sport. I'd be only to happy to accompany him just to lend a hand. May even offer to remove a few of the other MVSs if you find the removal of the afore mentioned bikes isn't sufficient stress relief. We could even do a detour and catch up with Helmut and a few other less stressed classic MV enthusiasts.

anyhow .. just a thought

cheers

Russ
emmevi125s
 

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Hi Guys and thanks for your concern.

The idea of removing the bikes to relieve the stress?............. i might pass on that at the moment thanks:)

A soft wall has the down side of just bouncing you back into all the crap your trying to get away from!

Seriously, thanks for the support and Sheriffofo, if you read this....cheers for the message.

Dorian.
 

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Discussion Starter #8
Hi Dorian

As usual your mechanical knowledge astounds me.

As for banging your head against a wall for stress relief ... a much better option is to remove some of the sources of the stress. Something along the lines of sending the Squallo and motore lungo to me in Australia. i'm sure Rob would appreciate the America or the TEL. He might even do a road trip over to collect the bikes in a similar way to what he did for his Sport. I'd be only to happy to accompany him just to lend a hand. May even offer to remove a few of the other MVSs if you find the removal of the afore mentioned bikes isn't sufficient stress relief. We could even do a detour and catch up with Helmut and a few other less stressed classic MV enthusiasts.

anyhow .. just a thought

cheers

Russ
emmevi125s
Now you know why I love this man - in a purely platonic way of course :laughing: Best idea EVER!!!!!

Hi Guys and thanks for your concern.

The idea of removing the bikes to relieve the stress?............. i might pass on that at the moment thanks:)

A soft wall has the down side of just bouncing you back into all the crap your trying to get away from!

Seriously, thanks for the support and Sheriffofo, if you read this....cheers for the message.

Dorian.
LOL @ soft wall.

Of course Dorian, it goes without saying but I will anyway, (without prying) if there is anything at all I can do to help, you know you only have to holler :)

Btw I sorted the 125 out - the drive is Veglia I am not sure if that's they were originally - Smiths intsruments & Velgia drive - it was as simple as a misaligned pin - took the wheel off - re-set and it works perfectly now..... I didn't need that soft wall this time ;)
 

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Hi Rob,

Veglia was orignial on this bike and in combination with Smith instruments installed.

@ Russ: great idea (btw, the packet is sent out today..)

Helmut
 

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Discussion Starter #10
Hi Rob,

Veglia was orignial on this bike and in combination with Smith instruments installed.

@ Russ: great idea (btw, the packet is sent out today..)

Helmut
Thank you Helmut :)
 
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