Electronic Speedo faulty

DaveR · 13-01-2020, 10:05 AM

Whilst out for my first ride of the year, after fitting new front tyre & brake pads, my Speedo started some very erratic behaviour. It started even before I rode off, the needle was swinging right around the dial. It did settle down, but never settled properly st constant sipped. It finally died altogether, with a few little flicks.
Initial thoughts are that it could be the connection at the back of the instrument cluster might be suffering from dampness, but any further suggestions welcome.

Darren69 · 13-01-2020, 10:47 AM

The plug where the sensor plugs into the loom or the sensor itself.

DaveR · 13-01-2020, 11:02 AM

I was initially thinking of the plug into the back of the speedo, but thinking about it, any one of the connections could cause a problem.

Dave

350TSS · 13-01-2020, 01:44 PM

Since the front wheel has been out and the problem arose immediately after that I would look at what could have been disturbed in the process

slob · 13-01-2020, 02:01 PM

the speedo on s4r gets its feed from the rear disc bolts passing a sensor on the rear caliper bracket, follow the wire to a connector under the r/h sidepanel. The symptoms you describe could mean the clocks themselves have failed though.

Luddite · 13-01-2020, 02:22 PM

Quote:

Originally Posted by 350TSS

Since the front wheel has been out and the problem arose immediately after that I would look at what could have been disturbed in the process

That was my thought initially. But then I remembered my S2R, which shares the same layout as the S4R, had the speedo drive from the rear disc.

Might be worth unplugging and removing the sensor and cleaning both the sensor itself and the contacts in the plug.

Luddite · 13-01-2020, 02:24 PM

Quote:

Originally Posted by slob

the speedo on s4r gets its feed from the rear disc bolts passing a sensor on the rear caliper bracket

You beat me to it, Rob, while I was trying to find the right page in the manual!

Luddite · 13-01-2020, 02:37 PM

If I recall correctly, the speedo sensor is a three wire type so this video may help if you want to test it. (You'll need a 12v dc power source.)

https://youtu.be/G1XzwZE6n8M

To test yours, leave the unplugged sensor in situ on the bike, connect it up as per the video, and then rotate the wheel to check for a voltage output.

Jez900ie · 13-01-2020, 02:51 PM

Fingers crossed the clocks aren't bust. They are hard to find and a million pounds plus shipping and VAT

Darren69 · 13-01-2020, 03:17 PM

If the clocks have failed will they still sweep on ignition, typically?

Nickj · 13-01-2020, 04:47 PM

Have had a clock set fail the initial sweep didn't, or it did a judder.
Have had a sensor of a similar type fail, the sealing had failed and the copper wires corroded and broken.

For the clock set I got hold of another single clock and swapped out the stepper motor.
For the sensor I got another.

DaveR · 14-01-2020, 07:09 AM

Thanks for all the replies & advice. more or less what I had in mind, clean & check all the connections, WD40 & fingers crossed that it's not a faulty speedo.
I'll update once I've had a chance to investigate.
On a similar vein, I unplugged both the cooling fans when I removed the radiator recently, now neither of them come on, I had the temperature right up to 120, seems unlikely that they should both fail, could I have affected the sensor just by unplugging them?

Dave

slob · 14-01-2020, 09:03 AM

more likely something didn’t get plugged in right

http://www.ukmonster.co.uk/monster/s...82&postcount=3

Bitza · 14-01-2020, 04:35 PM

Hi, if it does turn out to be the clocks I think I can help you out, so just PM if the need arises. Bitza

13-01-2020, 10:05 AM	#1
DaveR Registered User Join Date: Jan 2017 Location: Colchester Bike: S4r Posts: 93	Electronic Speedo faulty Whilst out for my first ride of the year, after fitting new front tyre & brake pads, my Speedo started some very erratic behaviour. It started even before I rode off, the needle was swinging right around the dial. It did settle down, but never settled properly st constant sipped. It finally died altogether, with a few little flicks. Initial thoughts are that it could be the connection at the back of the instrument cluster might be suffering from dampness, but any further suggestions welcome.

13-01-2020, 10:47 AM	#2
Darren69 Transmaniacon MOC Join Date: Sep 2013 Location: Sutton In Ashfield Bike: Multiple Monsters Posts: 6,022	The plug where the sensor plugs into the loom or the sensor itself. __________________ Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage

13-01-2020, 02:51 PM	#9
Jez900ie Pleasantly surprised! Join Date: Nov 2016 Location: Stoke on Trent Bike: M900ie Posts: 780	Fingers crossed the clocks aren't bust. They are hard to find and a million pounds plus shipping and VAT __________________ Monsters don't hide under the bed, they sleep inside the shed

13-01-2020, 03:17 PM	#10
Darren69 Transmaniacon MOC Join Date: Sep 2013 Location: Sutton In Ashfield Bike: Multiple Monsters Posts: 6,022	If the clocks have failed will they still sweep on ignition, typically? __________________ Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage

13-01-2020, 04:47 PM	#11
Nickj Too much time on my hands member Join Date: Jun 2007 Location: Forest Of Dean Bike: S2r Posts: 3,189	Have had a clock set fail the initial sweep didn't, or it did a judder. Have had a sensor of a similar type fail, the sealing had failed and the copper wires corroded and broken. For the clock set I got hold of another single clock and swapped out the stepper motor. For the sensor I got another. __________________ "The final measure of any rider's skill is the inverse ratio of his preferred Traveling Speed to the number of bad scars on his body." Song of the sausage creature

13-01-2020, 11:02 AM	#3
DaveR Registered User Join Date: Jan 2017 Location: Colchester Bike: S4r Posts: 93	I was initially thinking of the plug into the back of the speedo, but thinking about it, any one of the connections could cause a problem. Dave

13-01-2020, 01:44 PM	#4
350TSS Too much time on my hands member Join Date: Jan 2013 Location: Shipbourne Bike: M900 Posts: 1,419	Since the front wheel has been out and the problem arose immediately after that I would look at what could have been disturbed in the process

13-01-2020, 02:01 PM	#5
slob . Join Date: Jul 2003 Location: East London Bike: Multiple Monsters Posts: 9,707	the speedo on s4r gets its feed from the rear disc bolts passing a sensor on the rear caliper bracket, follow the wire to a connector under the r/h sidepanel. The symptoms you describe could mean the clocks themselves have failed though.

13-01-2020, 02:37 PM	#8
Luddite Registered User Join Date: Aug 2011 Location: Southampton Bike: M1100evo Posts: 2,465	If I recall correctly, the speedo sensor is a three wire type so this video may help if you want to test it. (You'll need a 12v dc power source.) https://youtu.be/G1XzwZE6n8M To test yours, leave the unplugged sensor in situ on the bike, connect it up as per the video, and then rotate the wheel to check for a voltage output.

14-01-2020, 07:09 AM	#12
DaveR Registered User Join Date: Jan 2017 Location: Colchester Bike: S4r Posts: 93	Thanks for all the replies & advice. more or less what I had in mind, clean & check all the connections, WD40 & fingers crossed that it's not a faulty speedo. I'll update once I've had a chance to investigate. On a similar vein, I unplugged both the cooling fans when I removed the radiator recently, now neither of them come on, I had the temperature right up to 120, seems unlikely that they should both fail, could I have affected the sensor just by unplugging them? Dave

14-01-2020, 09:03 AM	#13
slob . Join Date: Jul 2003 Location: East London Bike: Multiple Monsters Posts: 9,707	more likely something didn’t get plugged in right http://www.ukmonster.co.uk/monster/s...82&postcount=3

14-01-2020, 04:35 PM	#14
Bitza Bronze Member Join Date: Jul 2006 Location: Poole Bike: M900ie Posts: 469	Hi, if it does turn out to be the clocks I think I can help you out, so just PM if the need arises. Bitza __________________ Bitza