Does any body know the number of pulses the Fireblade speed sender outputs per revolution?

You will need 9 magnets on the propshaft if running 919 blade clocks with 185/60/13 tyres and 3.65 diff.

That will get you pretty close to true speed

Mine then all flew off

How did you work it out? I presume I can connect a multi meta and count the pulses as I turn the shaft by hand?

You won't pick up the pulses on a multimeter. You would need an oscilloscope, the pulse widths will most likely be mili seconds, a multimeter or your eye cannot pick that up.

Which speedo sensor?

I worked out prop RPM to road speed then ran my lathe at the equivilent of 60mph

Stuck a bit of 2" scaffold pole into the chuck and added magnets until the speedo read 60mph

Also with this gearing 125mph ~ 12,500rpm in 6th so you can see you are pretty close until the magnets fly off

For the sensor I used a ABS pickup from the sierra I think, may have been a range rover one as I had some of these laying around.

You do not need magnets BTW just lumps on metal, I need to make a thin plate and sandwich between the prop adaptor and prop really

Regards Mark

[Edited on 21/2/12 by mark chandler]