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The TTR250 FAQ web pages -> TTR250 -> Wanted adverts -> Speedo magnet
Post Info TOPIC: Speedo magnet
Martinm


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Speedo magnet
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Hi all I'm after a magnet that goes on the end of the front sprocket that makes the digital pick up work then hopefully my speedo will come to life. Thought I'd try on here first as they are quite expensive for a new one 

 



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1996 (N reg)Yamaha TTR 250
robs


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Hey Martin,

Just look up neodymium magnets on ebay or amazon. They're basically just extremely strong magnets. Should work and pretty cheap.

Cheers,

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Martinm


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That would be ideal if it works have you tried this,
Could you or anyone else give me some dimensions of the magnet that I would need to order

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1996 (N reg)Yamaha TTR 250
TTRfan


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All explained by Sergey in para c here http://www.ttr250.com/#More_speedo_information



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Martinm


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Screenshot_20181125_164628_com.ebay.mobile.jpg would these work if I drilled the centre out or does there need to be a brake in the magnet



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1996 (N reg)Yamaha TTR 250
Martinm


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Screenshot_20181125_165038_com.android.chrome.jpgif it's got to be done like this can I weld the magnet to the washers (are the magnets weld able) 



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1996 (N reg)Yamaha TTR 250
mossproof


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Save yourself the hassle:

totallyttrs.com/epages/699105d9-e4cc-4b32-b236-84e72cd67f84.sf/en_GB/

You can weld neodymium magnets, but once the coating has been damaged they corrode and the magnetic field weakens rapidly. A circular magnet such as the one in your pic will not have the correct field. You need alternating north south north south radiating out at 90 degrees to the axis, (for the Hall sensor to read as the magnet spins) rather than a north and south in the direction of the axis which is what you get in the Polo mint magnet. (The field will not change relative to the sensor as the magnet spins)



-- Edited by mossproof on Sunday 25th of November 2018 08:50:22 PM

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Martinm


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That's for an exchange I haven't got one to exchange


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JOHNYBOY


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just pop into our ttr steve he will be able to sort you out saves postage

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mossproof


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No John - he hasn't got one to exchange. Steve needs old units in exchange to recondition.

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ttr steve


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I have new oneswink and think I may have a spare used one somewhere????



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Martinm


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Hi Steve if you have got a second hand 1 that would be grate ill put a little order in, just doing final bits for mot



-- Edited by Martinm on Monday 26th of November 2018 12:49:42 PM

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ttr steve


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Yep I have one, just send me an email about cost please sales@totallyttrs.com

Cheers

Steve



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Martinm


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Ideal thanks Steve


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