A forum for owners of Yamaha TTR250 trail and enduro bikes!

JOHNYBOY · Super Guru

speedo

TTRfan · Super Guru

Hi there. My offer made back in October to test your senders and speedo head still stand John wink

Brian

JOHNYBOY · Super Guru

whats the cheapest way to send brian & whats the cost labour & to send back if they are ok many thanks

peteBLUEttr · Super Guru

£3.90 Royal Mail signed for 2nd class small parcel?

-- Edited by peteBLUEttr on Friday 26th of February 2016 09:55:08 PM

TTRfan · Super Guru

The Post Office will sort it out for you but Pete is right I think. Just make sure you get proof of posting in case you the parcel gets lost. Pretty rare occurrence unless its really really important like my sworn oath getting lost between Topsham Post Office and the Brighton Probate Office - grrrrrr

And put sufficient stamps in for me to return the gear after testing please biggrin

I don't have any intentions of charging you John - just trying to help a fellow TTR owner wink

Brian

JOHNYBOY · Super Guru

should the a/b & reset buttons work because they dont

peteBLUEttr · Super Guru

They are supposed to at least respond yes.

JOHNYBOY · Super Guru

brian is there any point you testing it for me when buttons a/b & reset do not respond i will send to you if this is not so i appreciate your goodself for helping me many thanks once again

TTRfan · Super Guru

Hi John

Would it still be useful if the speedo worked?

JOHNYBOY · Super Guru

thanks brian are you saying even though the buttons dont work the speedo might but what about the travelled miles for mot that is saying 0

TTRfan · Super Guru

Not a problem - they put down whatever the speedo says so, in your case, zero.

JOHNYBOY · Super Guru

hi brian made up my mind to buy a new trailtec bit expensive thou so i will be putting on the forum my old bits 3 speedo magnets 2 speedo heads untested & possible 3 senders how much do i ask for these or possible sell the lot as one lump thanks john

JOHNYBOY · Super Guru

speedo heads/ magnets/ senders for sale or swap what have you

TTRfan · Super Guru

Digital speedometer

masterbill · Veteran Member

Digital speedo - stopped working.

TTRfan · Super Guru

Hi Bill

Do you mean there is no display or back light on the speedo - or something else?

Br

masterbill · Veteran Member

Morning ,

The display has stopped working. when you switch on the neutral light comes on but no numbers show up.

Cheers

TTRfan · Super Guru

The warning lights are on a different circuit so if the speedo head is completely dead then it is likely a broken connection.

Brian

masterbill · Veteran Member

Hello Brian,

Ok - I will have a poke around.

Cheers

masterbill · Veteran Member

Hello again,

Well I had a poke around and got it working biggrin . Did a bit of mileage on the bike and now it's not working furious

I have a Yamaha service manual but there is nothing about the speedo in wiring diagram as far as I can see!

Cheers bil

TTRfan · Super Guru

Sounds like a bad connection or loose wire. A wiring diagram won't help you find that sadly. However persistence will pay off!

comeragh · Senior Member

Speedo Q&A mega thread

Moo · Senior Member

Digital Speedo Magnet

mossproof · Super Guru

Once the magnet has broken, there's no long term fix other than replacing it. Glues last about 25 miles! Totally TTRs exchange is a quick and easy solution.

TTRfan · Super Guru

RE: Digital speedometer

TTRfan · Super Guru

Curiosity got the better of me and I am pretty sure I have identified the source of back light!

Sadly the speedo I experimented on will never work again as my dismantlement was a little clumsy not knowing what held the assembly together disbelief

I am pretty sure that the back ligt is provided by a full panel the same size as the LED screen. Sadly it has a 4GY number so is almost certainly unobtainable separately.

Backlight assembly 1.jpg

Backlight assembly 2.jpg

Mobile chicane · Veteran Member

ebay £25 digital speedo

TTRfan · Super Guru

It certainly fills the space! Was it an easy fit and have you tried it against a GPS to test for accuracy?

Brian

Mobile chicane · Veteran Member

Easy fit with a bit of interpretation required for the instructions.

Once on the bike I used a GPS speed app to calibrate it and calibrated at 30 mph it tracks the GPS within 5% from 10 to 65 mph ( haven't been faster yet).

devon_rich · Senior Member

Have you got a link to the listing?

JOHNYBOY · Super Guru

i bought a trailtec 79.00 good value for money i thought

Mobile chicane · Veteran Member

www.ebay.co.uk/itm/131707735295%3AMEBIDX%3AIT

Right now that I have a proper keyboard to hand I'll write a better reply.

The ebay listing above is who I bought from and it arrived within 3 days of purchase.

The unit comes with a single sheet of a4 instructions with wiring inputs and outputs on one side and the wheel diameter setting on the other.

As my TTR has no indicators I only needed to use 6 wires on the unit.

permanent 0V and 12V from the battery, switched 12v from the ignition this gives the unit its memory capability and display on and off on key switch.

I then also used the +12v signal from the high beam to activate the high beam idiot light and the negative feed from the neutral switch to activate the neutral light.

The rpm scale was simply a case of popping the wire from the digi speedo into the in feed of the ignition coil.

I tested all this using a spare bike battery first to confirm which wires were required and how I was going to wire them to the bike.

Further research on the speedo that was on the bike when I bought it shows its from a Honda from the late 1970s to early 1990s so the 20k miles it has on it is probably way out and as I only have the last 2 mot's I suspect I'll never know the actual mileage the bike has done.

once attached to the bike by modifying the brackets a previous owner had made to fit the vintage Honda unit I attached the rather large sensor to the fork leg with a bracket I knocked up and used a large magnet in a plastic case I've had liying about in the garage for about 10 years to trigger it as the magnets supplied were a little small and I couldn't work out how to mount them.

I will have an attempt at remounting the unit a bit neater but as a soak test this should be fine.

once I got the unit reading the wheel rotations I did a walk test and got roughly 4mph shown walking the bike up and down the road.

I then attached my ram mount and android phone and used a gps speed app to do further calibration.

It is a cheap unit and only time and a few trail rides will tell if its robust enough for a trail bike, I will let it get wet I wont however be jet washing it as I suspect a direct blast of high pressure water will probably kill it

94Garry · Veteran Member

Can you upload a video showing the rev counter working? id love to have one on my TTR, ive an Open Enduro digital speedo im looking to replace as the front sprocket cover catches a load of dirt, i also have a speedo healer that has never read the correct speed, even though the online calculator has given me the codes to use, its never been good, clocks show 6mph out at 30mph!

ridelimousin · Veteran Member

Looks pretty decent for £25, interesting to see if it holds up to trail riding.

94Garry · Veteran Member

ridelimousin wrote:
Looks pretty decent for £25, interesting to see if it holds up to trail riding.

I bought one, got delivered today, looks good quality, easy to wire up and even easier to set up, going to try get it fitted soon weather permitting.

Mobile chicane · Veteran Member

Right managed to get a free day today so I've got some photos of how I mounted the dash + a video of the rev counter working.

https://www.youtube.com/watch?v=ZMYdMaJOXmM&feature=youtu.be

The flashing fuel gage:

The instruction sheet states 8 to 98 ohms, I have currently go this linked to the 0v line and it gives a full tank indication and seems to have sorted the issue I had where the trip would read miles but the odometer would remain at zero.

The clock however is now periodicly resetting itself so I'm going to source a few 10 ohm resistors and see which resistance to 0v line gives an empty but not flashing fuel level allong with a working odometer and a non resetting clock.

Settings:

on the setting screen you have 3 changable digits then a gap then 2 changeable digits.

From my fiddiling about the first 3 digits need to be 0,0,8 and the last two 1,4 this seems to give a speedo reading of about 5% higher than gps ( shows 30 gps says 28).

I will update further once I have played with the resistors

-- Edited by Mobile chicane on Sunday 2nd of October 2016 06:17:04 PM

94Garry · Veteran Member

Thanks for the further information, i plan on fitting mine next weekend.

Mobile chicane · Veteran Member

Ok quick update.

I have yet to try the resistors however I had a light off road crash at 6 ish mph where I low sided the bike and the speedo survived the fairly heavy impact.

I also jet washed the bike and blasted the top of the speedo with the jet wash by mistake again it survived with no issues.

Looks like a worthwhile buy.

I wonder of the original speedo sender can be used to drive this unit rather than having to mount a magnet on the front wheel and the sender on the fork ?

Moo · Senior Member

Digital Speedo Magnet

dlee22 · Senior Member

Hi Malcolm,

I brought a sensor from the ttr shop a week ago, it works on mine so you can borrow it to see if it was that if you like? You are local after all!

Dan

Moo · Senior Member

Top man!! I'll be over for a cuppa.

ttr steve · Super Guru

Nice one Dan smile

Keep us posted please Malcom.

Steve

Moo · Senior Member

Popped over to Dans for a cuppa and a test out of the sensor he recently got from Steve. Worked perfectly! So the sensor is duff.

You have incoming PM Steve :D

vacommuter · Member

speedo

mossproof · Super Guru

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.

JOHNYBOY · Super Guru

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

vacommuter · Member

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

mossproof · Super Guru

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.

TTRfan · Super Guru

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

comeragh · Senior Member

RE: Speedo Q&A mega thread