Speed sensor

[reillypadraig]

Since I bought the bike the speed sensor hasn't worked, took off the front wheel and there is 2 notches sitting in bearing grease but there broken and on the other side the magnetic bearing in the speed sensor has a space for the notch in one side and looks like the other side is sheared ??
Is that magnetic bearing supposed to have a notch in both sides.

Also what needs to be replaced for the 2 notches in the bearing?

[darrsi]

You need number 15


http://www.yamahascooterspares.co.uk/spares/epc2.asp?modelID=9655&PageiD=41&m=YAMAHA+FZS600+Fazer+METER&uID=0


If you don't line it up properly when refitting the wheel then it will snap again and become an expensive habit.

[Dead Eye]

Whereabouts are you? I think I have one

[unfazed]

Common enough problem, I first came accross this on a Fazer some years ago, the owner was complaining about the 20 Quid cost to replace it, despite telling him it was illegal to ride without a working speedo.
I solved both problems by washing the parts in thinners and gluing the tabs back on with superglue.    Lasted 4500miles until he broke it again putting the wheel back on after getting a puncture.
I have superglued a few since and there are still good. Worth a try if you have all the bits

[Ruby Racing]

Do you notice any engine running problems as a result of the speed sensor not working? If so can you say what the symptoms are?

[darrsi]

Do you notice any engine running problems as a result of the speed sensor not working? If so can you say what the symptoms are?

Like what? It's nothing to do with the engine?

[Ruby Racing]

Do you notice any engine running problems as a result of the speed sensor not working? If so can you say what the symptoms are?

Like what? It's nothing to do with the engine?

That's what I thought. The speed sensor is linked to the ignitor box via the pick up coil (see wiring diagram here: [size=78%]http://www.docstoc.com/docs/26736963/FZS600-2000-WIRING-DIAGRAM[/size] ) and somehow has a bearing on how the engine runs. I'm currently trying to find out exactly what happens if you remove either the speedo or the speed sensor. If the speed sensor is removed or not working properly then you get a fault code on the rev counter where the needle constantly moves between 3,000rpm and zero.


I have just bought a 1999 FZS600 as a project bike and want to remove the sensor and speedo, but don't want to end up with a ill running engine as a result, hence my question.

[darrsi]

When the lugs break on the speed sensor, then it doesn't turn in the wheel, so the clock just shows 0mph because it is simply not moving.
When it happened to me i don't remember any needle bouncing about, it just didn't do anything.


I have a feeling the 3000rpm you're on about is an error code for the TPS.

[Ruby Racing]

When the lugs break on the speed sensor, then it doesn't turn in the wheel, so the clock just shows 0mph because it is simply not moving.
When it happened to me i don't remember any needle bouncing about, it just didn't do anything.


I have a feeling the 3000rpm you're on about is an error code for the TPS.

Sorry, you're correct. Needle alternating from 3,000rpm to zero is a TPS fault.


If it alternates from 4,000rpm to zero, then it shows there is a fault with the speed sensor.

[darrsi]

An electronic fault maybe, but not if it was a broken lug issue, it would be reading the bike as not moving.


May i ask why you want to remove it anyway?

[Ruby Racing]

An electronic fault maybe, but not if it was a broken lug issue, it would be reading the bike as not moving.

I believe it controls the TPS based on a combination of engine speed, gear selected and road speed and so needs to get a speed reading, or rather electrical signal from the speed sensor. I've seen plenty of posts on this forum stating that they have to be left on the bike for the engine to run properly. Just trying to establish how it runs without these parts fitted.

May i ask why you want to remove it anyway?

Got a project bike and changing forks, hence removing speed sensor and changing clocks, hence no interface with CDI. Just need to know what I'm letting myself in for.

[reillypadraig]

I'm from Ireland,

Whereabouts are you? I think I have one

Not sure if the speed sensor directly affects the ignition coil on this model.

Can't tell if it is affecting the bike as my carbs have to be replaced so bike isn't running great at the minute.
So this sounds common enough??

[Dead Eye]

The lugs snapping on the magnetic section (Part 14 as listed above by darrsi) is a common ailment. The speed sensor itself is less common but has been known to happen. Mine went bust back in August and I ended up getting a second hand replacement from someone breaking a Fazer. If it is the sensor then you will likely get the rev needle issue - it flicks every 3-4 seconds between 0, 4000 and the actual revs - refer to the owners manual, it is listed in there. If its the lugs, you will likely just get a reading of 0 on the speed dial

Are you interested in the part? Only reason I ask is because someone else wants it but I gave you first shout

[reillypadraig]

I would be but I won't have cash till the end of the month, only get paid monthly. If someone else wants it sooner I won't ask u to hold on to it

[Dead Eye]

Ok, no problem

[unfazed]

I'm from Ireland,

Whereabouts are you? I think I have one

Not sure if the speed sensor directly affects the ignition coil on this model.

Can't tell if it is affecting the bike as my carbs have to be replaced so bike isn't running great at the minute.
So this sounds common enough??

No it does not affect the running of the carburettor models