Speedo sensor testing?

Is there an easier way of testing the speedo sensor other than whats in the Haynes manual? (AA batteries and resistor)
Perhaps with a multimeter etc?

[flymo]

Originally Posted by rf9rider

Is there an easier way of testing the speedo sensor other than whats in the Haynes manual? (AA batteries and resistor)
Perhaps with a multimeter etc?

cant you just lift the front wheel with a paddock stand and spin it?

The speedo doesn`t work.
Wanted to test the sensor before buying another one, then finding out its something else.

[flymo]

Originally Posted by rf9rider

The speedo doesn`t work.
Wanted to test the sensor before buying another one, then finding out its something else.

The Haynes manual is correct, not sure which model of the bike you have but you need to check out the correct manual from here http://www.sv650.org/sv_manuals.htm

I looked at the K3 pointy manual on page 8-38 (Inspection of the speed sensor) and it describes the test method. Its a hall effect magnetic sensor and cant be measured just by connecting a multi-meter to the wires.

The batteries are to provide voltage to the circuit when you have the speed sensor disconnected from the wiring loom, you may find it easier with a 9V battery as its easier to connect and wont go rolling around the floor.

When its rigged up you should spin the wheel slowly and see the voltage measured vary from 0v and whatever voltage battery you use e.g. 9v. If thats working then the sensor may well be fine. Check for obvious damage though by removing the front wheel, the little lugs tend to get chewed off preventing the rotor from rotating properly.

If you can get one, far easier to just plug in another speedo and spin the wheel. Make sure that you actually have power to the speedo unit (are the warning lights coming on etc) otherwise nothing will work. Other things to check are obvious poor connections, particularly where the speedo connects to the loom, give that a squirt of WD40. And of course take a look at the fuses and make sure they are all intact, especially the one for the signal circuit as this powers the speedo unit on the later models.

Thanks Flymo.
Its the wifes bike, 2001 curvy.
One thing i didn`t know is that fuse you mentioned.
I have to remove the front wheel etc to clean up the grotty looking forks, so will have a look at the rotor etc over the weekend.
All the warning lights and the lights that illuminate the clocks are working fine.

Rotor inside the sensor was in about 1000 pieces.
Problem solved hopefully, ordered a new one.
Thanks for your help.

[flymo]

Originally Posted by rf9rider

Rotor inside the sensor was in about 1000 pieces.
Problem solved hopefully, ordered a new one.
Thanks for your help.

Yeah that'll be it. Common problem.