Ducati Sporting Club UK > Model Specific - Discussion, Technical Problems and Help > 999 / 749 > Some 999 Questions

[ttstu]

A few questions.

• What size socket is required to remove the rear wheel nut?
  Any reason why a 180 section rear shouldn't be fitted to a 999?
  If I have a faulty speedo sensor is it an easy DIY job?
  Is the sensor on the back wheel assembly?
  

Thanks all.

[clint]

Rear socket size is a 36mm. Torque setting 180nm.
180 rear is no problem at all. Its something i shall be doing to my 999.
DIY Speedo sensor not sure.
Sensor is on the back wheel.

Clint.

[Loz]

A 180/55 back tyre on the 999 works like a charm for me and many others here.

[ttstu]

Thanks boyz.

[weeian]

ttstu, my digital clock has started playing up again on the 749 m8, they think it could be a faulty earth.

/ian

[Edited on 9-5-2005 by weeian]

[ttstu]

Ah but I wonder how they'll trace the fault?

[guest1]

Speed sensor is on swingarm right hand side

positive AL

[ttstu]

Anyone got any idea why the sensor fails? Is it an earthing problem or generally an issue with the sensor itself?
How different is it to say the 916 etc?

[KeefyB]

Originally posted by ttstu
Anyone got any idea why the sensor fails? Is it an earthing problem or generally an issue with the sensor itself?
How different is it to say the 916 etc?

The 916 series bikes have a completely differant speedo set up.The drive comes from a gearbox mounted on the front wheel spindle.It is mechanicaly connected to the speedo via a cable.
749/999 bikes have an electronic sensor to trigger the speedo.The sensor is mounted in the plate that holds the rear brake caliper.The sensor points at the bolts that hold the rear disc and basically triggers everytime one goes past.Hence why you can get a speedo reading when rolling backwards!
The sensor sometimes fails due to an excess of dirt/crud/corrosion on the bolts or sensor.They have also been known to fail where someone has fitted titanium bolts to the disc carrier.

[Gizmo]

Originally posted by KeefyB

The 916 series bikes have a completely differant speedo set up.The drive comes from a gearbox mounted on the front wheel spindle.It is mechanicaly connected to the speedo via a cable.
749/999 bikes have an electronic sensor to trigger the speedo.The sensor is mounted in the plate that holds the rear brake caliper.The sensor points at the bolts that hold the rear disc and basically triggers everytime one goes past.Hence why you can get a speedo reading when rolling backwards!
The sensor sometimes fails due to an excess of dirt/crud/corrosion on the bolts or sensor.They have also been known to fail where someone has fitted titanium bolts to the disc carrier.

If the sensor fails does it effect engine management and fueling?? On my SP2 it failed and bike ran ok up to about 5000 rpm then ECU light came on and it wouldn't rev, i got used to coasting along then switching ignition off and back on to reset it until sensor was replaced. that was fitted on the gearbox AIR.