Yamaha TY250A Speedometer Rebuild

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thornie
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Yamaha TY250A Speedometer Rebuild

Postby thornie » Tue Oct 02, 2012 5:33 pm

Hi,
Just joined the Forum and I have already found it a great scource for information to assist me in the restoration of my TY250A.
However I now need advice on how to take the speedometer apart and in particular the removal of the top rim that is spun onto the main body.
I have previously tried to remove a similar top from a DT2 speedometer with mixed results (cracked glass) and given the rarity of these speedometers I don`t wish to repeat this.
Any advice appreciated.



Jon V8
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Re: Yamaha TY250A Speedometer Rebuild

Postby Jon V8 » Wed Oct 03, 2012 5:22 am

I wonder if its worth trying to rebuild it,here in the UK most trials bike have their speedo's removed as they are not used on the road.There must be thousands of them sitting on shelves in garden sheds,with very low recorded mileages on them.I cant remember what I've got in the way of Yam speedo's,I certainly have a couple of Montesa ones hanging around.Would it be worth asking around on here or on Trials Central if there are any up for grabs ?



thornie
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Re: Yamaha TY250A Speedometer Rebuild

Postby thornie » Wed Oct 03, 2012 9:59 am

You would think this would be the case but I have had little success in locating a good speedometer locally and even on ebay they seem to be thin on the ground. I`ll take your advice and see what is available via the UK forums but would be interested in hearing from anybody with one they are no longer using.
I have two TY250A projects under way. An original specification restoration (speedo needed) and' a lightweight' TY250 along the lines detailed below. I`m close to finishing the first and have acquired about 30% of the specialist parts for the second.

http://ty-250-twinshock-yamaha.blogspot ... tions.html



David Lahey
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Re: Yamaha TY250A Speedometer Rebuild

Postby David Lahey » Wed Oct 03, 2012 1:00 pm

As Jon suggested there are lots of TY speedos out there on shelves. I have a few I don't need, but they have all been used. What are the properties you are wanting to see in a TY speedo to make it "good"?


relax, nothing is under control

thornie
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Re: Yamaha TY250A Speedometer Rebuild

Postby thornie » Wed Oct 03, 2012 2:50 pm

Hi David,

The minimum specification would be the following:-
Works/ good face and clear glass/ no rust to inner face rim/ no excessive rust to the main body but the "normal" rust found under the rubber gasket no problem. No dings to body.
I have both a good mounting bracket and the rear body cover so a mixture of these plus one of the specification above should make a good unit.

Appreciate your interest



Tim Stone
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Re: Yamaha TY250A Speedometer Rebuild

Postby Tim Stone » Wed Oct 03, 2012 4:34 pm

I have the following MCS brand sitting on my shelf, new in box, unsure if right type but it came with a box of parts with a TY175 purchase. I also have a TY250R (pinky) one sitting on the shelf if it is any interest?
Attachments
SAM_0606.JPG



Tim Stone
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Re: Yamaha TY250A Speedometer Rebuild

Postby Tim Stone » Wed Oct 03, 2012 4:36 pm

box it came in
Attachments
SAM_0610.JPG



Tim Stone
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Re: Yamaha TY250A Speedometer Rebuild

Postby Tim Stone » Wed Oct 03, 2012 4:37 pm

bracket on back
Attachments
SAM_0608.JPG



Tim Stone
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Re: Yamaha TY250A Speedometer Rebuild

Postby Tim Stone » Wed Oct 03, 2012 4:38 pm

TY250R (Pinky)
Attachments
SAM_0604.JPG



Mark K
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Re: Yamaha TY250A Speedometer Rebuild

Postby Mark K » Wed Oct 03, 2012 5:14 pm

I can't help with finding a speedo, but just a couple of comments anyway.
I do recall that way back in August of 1973 when I bought my TY250 it had a speedo in MPH not Km/H.
Also unlike the first one pictured I'm sure it didn't go up to 220Km/H. That's pretty impressive for a little TY175!
From memory my old one displayed up to something like 80MPH, but I don't recall ever doing much more than about 45MPH.
As well as that it was mounted down on the fork leg, but I can't recall just what the mounting bracket looked like, except I'm not sure that it looked like the one pictured.



thornie
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Re: Yamaha TY250A Speedometer Rebuild

Postby thornie » Wed Oct 03, 2012 8:29 pm

Hi Mark,
Your attachment with the 0-120km face is exactly like the one I am restoring from the front. The correct bracket for this speedometer is a round circle band with a return leg that attaches to the front fork. The band fits over the rear body of the speedometer and is sized to be an interference fit with a rubber gasket between it and the main case.
I would be interested to see a side elevation of your speedometer to confirm they are the same unit,
As a matter of interest I have removed the speedometer face by gently prising up the return of the face ring. This took about 45 minutes and the use of a illuminated magnifying lamp assisted the task. The rubber gasket securing the glass had hardened and allowed moisture to entry with subsequent rusting to the inner case and face glass backing ring. The speedometer case has two weep holes in the rear for this but these look ineffective.
So lots of rust and I have not checked the speedometer mechanism but I intend to continue and see what I can make of it and I`m still interested in acquiring a better one.



Whistler
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Re: Yamaha TY250A Speedometer Rebuild

Postby Whistler » Tue Feb 21, 2017 7:08 am

David Lahey wrote:As Jon suggested there are lots of TY speedos out there on shelves. I have a few I don't need, but they have all been used. What are the properties you are wanting to see in a TY speedo to make it "good"?


I realise it was some time ago, 5 years, but I'm chasing a used speedo for a 1975 TY250 B, most TY 175's and 250's used the same part number. Don't mind restoring it providing it works and is not corroded/ rusted in terms of the face.



Whistler
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Re: Yamaha TY250A Speedometer Rebuild

Postby Whistler » Tue Mar 07, 2017 8:51 pm

Whistler wrote:
David Lahey wrote:As Jon suggested there are lots of TY speedos out there on shelves. I have a few I don't need, but they have all been used. What are the properties you are wanting to see in a TY speedo to make it "good"?


I realise it was some time ago, 5 years, but I'm chasing a used speedo for a 1975 TY250 B, most TY 175's and 250's used the same part number. Don't mind restoring it providing it works and is not corroded/ rusted in terms of the face.


Can I buy one off you?



David Lahey
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Re: Yamaha TY250A Speedometer Rebuild

Postby David Lahey » Tue Mar 07, 2017 9:25 pm

Whistler wrote:
Whistler wrote:
David Lahey wrote:As Jon suggested there are lots of TY speedos out there on shelves. I have a few I don't need, but they have all been used. What are the properties you are wanting to see in a TY speedo to make it "good"?


I realise it was some time ago, 5 years, but I'm chasing a used speedo for a 1975 TY250 B, most TY 175's and 250's used the same part number. Don't mind restoring it providing it works and is not corroded/ rusted in terms of the face.


Can I buy one off you?

Sorry I just realised that that you question was probably aimed at me.
Mine are all used and they are all damaged aesthetically one way or another. If you explain a bit more what you are wanting I will get them out and have a look. Which bit are you calling the face and are you after just the speedo or the cable as well and other bits from the wheel that drive the cable? Does it matter if they are in miles or kilometres? I can't remember which speedo came off what model.
Regards
David


relax, nothing is under control

Whistler
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Re: Yamaha TY250A Speedometer Rebuild

Postby Whistler » Wed Mar 08, 2017 8:11 pm

Thanks for responding Dave.
Just not keen if the inner dial or face is damaged or corrroded. Providing you have one that is in restorable condition it can be in miles or km. If necessary I may be able to have it professionally restored. Can you please send some photos of the best of the bunch? Alternatively I could go for a ride and come take a look if its ok with you and you live in the Brisbane, Sunshine or Gold Coast areas.
What do you want for a unit?
Regards
Chris.




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