Wow...Speedo way off

Wait...u drove your Moto for 10800 miles on one trip?
Impressive and Congrats

I wouldn't touch that with your mouse. :lol:
Steve

My first big trip was 2000 miles back in 1980, then every year I went on a better trip. I was 21 when I planned a 5000 mile trip. I always had 2 weeks vacation so 5000 miles was easy. Finally in 1990 the USA 4 corners tour looked possible, then in 1991 took a longer route missing cutting across Canada, so a little longer miles. The KZ1000 made every trip and I was never stranded. I always laugh at this, as my Dad had a new GL1200 Honda, and my uncle had a new 1983 Yamaha V4, whatever it was touring bike, and they would take a 3 or 4k mile ride, every time one of them came home on a bus.

The 78 Z1r has 18inch rim, I believe that the drive for the speedo is the same as used on the KZ1000 with the 19 inch so the only difference I can think of is the speedo calibration. By the way my Z1R speedo was within a couple of kph either way depending on the tyre wear, so it was fairly accurate

I'm pretty sure all Kawasaki speedometers are calibrated the same: 2240 revs = 1 mile (usually stamped in ink on the back).
Multiplying the number of wheel rotations per mile by the speedo drive gearbox ratio should equal 2240. So to figure out whether or not the speedo is accurate, you need to know the circumference of the wheel/tire & the speedo drive ratio and compare those to stock --- If the number is near 2240, then the speedo is either simply inaccurate or defective.
The magnets inside the speedo are old & could be no good.

For different sized wheels, Kawasaki varied the tire size &/or the speedo drive ratio so that the speedometer will be accurate. Many KZs have a 26T speedo drive gear w 9T pinion. Since it has 18" wheels, the Z1R may have a 25T w 9T pinion. If a 26T speedo drive is installed, that would be one source of speedometer error. Even when new, most if not all KZ speedometers will have at least some error built into them, some more than others.

Is there a small GPS speedo one can fit in a discrete place?
Steve