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

Mike Wright · Veteran Member

RE: Digital Speedo Sensor

mud · Veteran Member

Speedo stopped working

mud · Veteran Member

Now sorted, started working after a 40 mile blast for some reason? Witchcraft me thinks!

Michael TTR250 · Veteran Member

Speedo not working

TTRfan · Super Guru

Take the front axle out and turn the RH fork leg and you will get access to the inside of the speedo drive.

Clean off the grease, take off the circlip and lift out the 3-tab washer.

You will see from the inside of the washer if it has been slipping on the drive.

Because the gear is expensive - see here - it is always worth trying the s/s tab washer first.

Brian

Michael TTR250 · Veteran Member

Thanks Brian,

How do I go about paying for one (and the postage) and having it sent to me in Australia.

Thanks, Michael

TTRfan · Super Guru

Send an email to sales@totallyttrs.com with a note of what you want and where you are and Trish will sort you out wink

The s/s washer doesn't always cure the problem but to give it the best chance make sure you clean out the internals of the drive gear very well and particularly make sure there is no dirt or grit that might jam the worm gears.

Cheers

Brian

Michael TTR250 · Veteran Member

Thanks mate will do.

Cheers,

noeyedear · Senior Member

TTRfan wrote:

The s/s washer doesn't always cure the problem but to give it the best chance make sure you clean out the internals of the drive gear very well and particularly make sure there is no dirt or grit that might jam the worm gears.
Cheers
Brian

some times you need to change the washers as well.

TTRfan · Super Guru

noeyedear wrote:
TTRfan wrote:

The s/s washer doesn't always cure the problem but to give it the best chance make sure you clean out the internals of the drive gear very well and particularly make sure there is no dirt or grit that might jam the worm gears.
Cheers
Brian
some times you need to change the washers as well.

Good point and a good reminder to add a note to our advert!

If the washers are worn then it might leave the new tabbed washer wobbling about a bit!

Brian

TTRfan · Super Guru

Whoops - seems we have had a run on the 3-tab washers and Mrs TTR has sold all our stock confuse

I ordered a new supply from our fabricators a little while ago and chased them up today. Hope to get new stock real soon!

Sorry to have messed customers around - not good disbelief

Brian

TTRfan · Super Guru

Wahoo - new supply of 3-tab washers arrived today biggrin biggrin biggrin biggrin biggrin biggrin biggrin

Cubber · Super Guru

Wahey - you sound as cheerful as a cat with three tab washers.

Martyn

Monkey_Bones · Member

Speedo dashlight

Markvan · Guru

Hi. My 2006 ttr has a dash light. Maybe try your bulb. I did the light switch job from the imfo on this site. All my lights go off with one switch. Although ive left my dash light running. Still deciding if i will do the tail pipe air box rejet job. I only weigh about 70 kgs so the bike gets up and goes already.

Monkey_Bones · Member

Thanks

all good found it, it was unplugged and tucked in with the main wiring loom.

Henry · Veteran Member

Digital Speedo gone blank

TTRfan · Super Guru

Hi Henry and welcome to the forum!

It was cleaning up the exhaust that caused the problem biggrin

Seriously, all I can suggest at this stage is that you take the headlight off and carefully examine the wires going into the speedo's block connector and the terminals themselves for any corrosion or damaged wires. If it all looks good then give both sides of the connector a good spray with electrical clean up fluid and connect it up again keeping your fingers crossed it was a poor connection!

If that fails then I am not sure what to suggest next as I don't know what the individual wires do.

I have a memory of seeing a diagram explaining the wiring but can't immediately find it. Maybe someone else can help?

Brian

PS This is the best I can find at the moment:

Digital speedo circuit.jpg

Henry · Veteran Member

Hello Brian , Thank you for your extensive reply.

I just came up from the garage and I am reading your reply ( I appreciate your help a lot ). I fixed it, as you suggested it was a simple cleanup of the Blue Terminal block.
I am a happy man now biggrin

Just a small contribution from my end. a few days ago I added a small tachometer. I used aluminium piece and attached it to the bar clamp bolt. I lined it up so I can watch both the speedo and the rev counter whilst driving.

An addition would be a small green led with a shunt to light it up when I turn on the key.

Phote attached , shall I post it elsewhere Brian ? Nice eve and a happy weekend to all

TTRfan · Super Guru

Pleased to hear it was a simple fix Henry wink

Regarding the tacho, it would be good to start a new thread on the modifications forum here . I am sure members will be interested to see what you have done.

Brian

Padowan · Senior Member

Recalibrating the Speedo

TTRfan · Super Guru

A new one to me Simon!

No adjustment that I am aware of cry

Could the three-tab washer in the drive gear be slipping?

Brian

TTRfan · Super Guru

If you want to pop around and borrow an mph speedo head to try then you are more than welcome smile

Cubber · Super Guru

It could be that the needle isn't FIRM on the spindle?

It could be that your tyre is OVER inflated?

It could be the cable is partially broken?

It could be your "goods track" isn't reading correctly? - What's a "goods track" confuse ?

IMO you'd better visit Brian and try a replacement to be sure.

Martyn

Padowan · Senior Member

Goods track, haha. That's my phone autocorrecting GPS Track!

It's not urgent, I'll do some tests/checks after next weekend once the Cambrian rally is out of the way.

Cubber · Super Guru

Padowan wrote:
........................ the Cambrian rally is out of the way.

Good luck in your Cambrian ADVENTURE, Simon.

Martyn

Bryzer · Member

Purple wheeled speedo

Henry · Veteran Member

Hello Bryan,
I dont know , but are you having trouble with yours?

Mine was working fine and one day the display went poof. I took out the headlamp and its cover ,cleaned the connectors and it worked again ;)

Henry

TTRfan · Super Guru

Hi Bryan

I test digital speedo heads by plugging them into my "shopping" TTR where I know the existing speedo is working. If it doesn't work then the speedo head is duff coz I know everything else is OK.

Is it the speedo head on your own TTR? If so, then the first suspects are the magnet and sender unit on the front sprocket.

Check the magnet is in one piece and, if so, check you have the pulsing output on the speedo sender. If both OK then it starts to point to a problem in the speedo head itself cry

Brian

Bryzer · Member

Hi Brian
Jam wanting to sell the speedo unit as I have stripped the bike down to the basics for enduro purposes . I have removed all the connections and exess wiring that goes with all the switches and speedo but stupidly didn't cheack it worked before I started . I know these are hard to come by these days so didn't want to throw it out if someone can use the parts. The magnet is fine but someone has been at the wires and cut the pick up wires and been messing with the generator wires . Plus there's only one other ttr in Paphos and it's the blue tank model so I can't even test it on that!
Thanks for the info

Bryan

saintken · Veteran Member

RE: Digital Speedo gone blank

TTRfan · Super Guru

saintken wrote:
When I do the speed sensor test I get a constant voltage of 4.79v. In my simple mind I think a broken electrical component should have 0v, I'm assuming it's broken, have you got a spare exchange unit in stock Brian?

Hi Ken

I am not too clever on electrics but the manual says the voltage should go between 5V and 0V as you slowly rotate the rear wheel.

If yours doesn't do this then, yes, there is something wrong.

We have just one working sender unit in stock at the moment if you need it - see http://www.totallyttrs.com/#Speedometer_pickup

Brian

saintken · Veteran Member

OK Brian, money sent but wont be able to post old unit until Monday now, ta very much :)

ago · Veteran Member

speedo accuracy

BM Steve · Guru

Analog Vs Digital Speedo

The Mancunian · Senior Member

04 UK speedo grief.

j180 · Senior Member

Don't look at it mucker, hope this helps ☺

The Mancunian · Senior Member

How many miles till you need to think about reserve ?

peteBLUEttr · Super Guru

When it grinds to a Holt! Ha na, I usually flick it to reserve on the 70th mile. I can only really get 80 ish out of my tank. But then again I am fat ha

The Mancunian · Senior Member

peteBLUEttr wrote:
When it grinds to a Holt! Ha na, I usually flick it to reserve on the 70th mile. I can only really get 80 ish out of my tank. But then again I am fat ha

70 it is then wink I'll have a fiddle with the speedo this weekend.

locky · Guru

I think other Yamaha models use the same speedo DT125 etc.
You might find one with similar miles on ebay.

The Mancunian · Senior Member

Good idea, might buy a cheap one to keep me going and then have a go at fixing this. Don't really need it but it'd mess with me head.

The Mancunian · Senior Member

So, I take it these things are sealed and non-mendable?

TTRfan · Super Guru

Someone started a thread with some pics showing how to get into the mechanical speedo head but darned if my searches can find it

Searched on speedo, head, apart etc but no result!

My recollection is that the top of the speedo is glued on. To get it off you need to cut around it in some way. Perhaps using a small hacksaw blade or a Dremel. There is bound to be a small amount of damage when you come to lever it off but if the alternative is to replace it then you have nothing to lose!

If you do have a go then please take some pics and let us know how you get on wink

Brian

The Mancunian · Senior Member

I'll have a go in the week. The speedo works fine, but the clicks don't clicky. Like you say, nothing to lose.

peteBLUEttr · Super Guru

What actually happens to them then, how do they break? Yeah I find the search box on here sometimes doesn't give you the best results ever.

The Mancunian · Senior Member

Someone's had a go at mine before. It does look like there is a tiny slot to shove a terminal screwdriver in the base and flick it open and that's what they've tried and given up. Bit daft being 'totally' sealed. Speedo's perfect through them flashy things ont roads now, just can't see how far I go. It's bugging me.
If the weathers crap again tomorrow I'll have a go at it.

TTRfan · Super Guru

peteBLUEttr wrote:
Yeah I find the search box on here sometimes doesn't give you the best results ever.

I sometimes revert to a Google search using Item site: http://ttr250.activeboard.com where you replace Item with whatever you are looking for but it didn't help me find the speedo thread I was looking for

Brian

The Mancunian · Senior Member

Not everyone calls them speedos though eh? that's half the battle. The amount of lads I know use the word dash gets me, it's a bleedin bike not a car!

comeragh · Senior Member

RE: Speedo not working