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Guru

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hi there folks does anyone know how to test a speedo head i have the sender but no magnet i do not want to buy any parts then find out the speedo head is no good many thanks



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Super Guru

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Run really fast with it

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Pete. South Somerset, England.



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Ha only joshin biggrinnowink



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Pete. South Somerset, England.



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You could send to Brian and get him to plug into his shopping TTR. Relatively pricey though with signed for I spose. What town you live in? There might be someone near you who can help you

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Pete. South Somerset, England.



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John I can send you my sender stuff on sale or return if you want! If your head works with it, you can buy or still send it back if you have a change of plan. Give me a ring on the number I gave you on the pm.

Cheers,

Simon.



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thanks pal dont know which way to go yet but many thanks

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1994 TT250R Open Enduro. My electronic speedometer occasionally reads zero while moving. The other day commuting home it read 0 the entire time. Today upon start up the speedo ran fine. I'm guessing either a loose or corroded wire or sensor starting to go bad. Thoughts?

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Usually it's the speedo sensor magnet that runs on the front sprocket breaking up or coming loose. Take off the sprocket cover and see if the magnet is held firm or is loose/starting to break up. If not, start looking at the connections along the loom. Unfortunately the sensor next to the magnet can give up too. Only way to check this is to try another known sensor in it's place.
Good luck,
Simon.

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i ended up buying a trailtec brand new £79.00 loads of features on it works well i would post photos if i could tried many times

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I opened the cover over and the innards look good and clean. .  Double checked some connections in the wiring that I could easily access to the speedometer display and everything looked good. 



-- Edited by vacommuter on Sunday 7th of May 2017 05:50:51 AM

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Senior Member

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Looks can be deceiving That shiny round bit is the magnet, but if the actual magnetic bit (the grey bit between the shiny washers) is able to spin freely, that could still be your problem. If it is nice and tight in there, the problem lies elsewhere.

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Super Guru

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Although it seems improbable, moisture works its way down the cables into the body of the sensor and corrodes the Hall sensor.

Easy enough to test if you have a multi-meter.

This is what it says in the FAQ at http://www.ttr250.com/#More_speedo_information :

Yellow +5v into the speedo from the speed sensor at the sprocket. This is the pulse wire, the pulse is sent as +5v, -5v, +5v, -5v etc.

Put one probe to earth and the other on the yellow wire and spin the magnet. You should get a pulse as described.

Brian



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