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[Lecram]

I did it! It was much more work as expected, but I succeeded. The hardest part was to remove the center screw. I already removed the belt so the shaft turned with the screw. I finally used a pully puller to fix the gear and was able to unscrew the hex. That hew was very much tightened!
I removed the gear with the same pully puller and mounted the new gear.

It works great, much more acceleration power. The highest speed is now 135 km/h, for me that's enough. I achieve that speed in an instant. The speedo shows a 20% higher speed than the real speed, measured with a GPS.

[Lecram]

other pics

[Lecram]

other pics

[NoiseBoy]

I believe there is a method to adjust the speedo reading on the dash. It would be worth searching the forum for the info.

[BrianTRice@gmail.com]

The method involves changing a setting in the firmware. The OBD-II port provides serial access to it. The easiest way to manage this is to use DigiNow's Reaper Bluetooth plug from Hollywood Electrics. https://hollywoodelectrics.com/product/diginow-data-reaper-dongle/

[Cortezdtv]

On the 13 Koso gauge you can hold the buttons and just change the "r" value and that changes the calibration

[NoiseBoy]

On the 13 Koso gauge you can hold the buttons and just change the "r" value and that changes the calibration

This is what I was thinking of. Didn't realise it was so involved on the newer bikes. Sorry!

[BrianTRice@gmail.com]

On the 13 Koso gauge you can hold the buttons and just change the "r" value and that changes the calibration

Whoa! I did not realize what Zero's gauge cluster came from!

The 2011-2013 models appear to be based on the RX-1N.

2010 and earlier models appear to be based on the RX-SR.

And they have instruction manuals! (I've immediately added these to my Dropbox collection of Zero-related technical documents)

The 2014+ models are more obviously a custom application, but maybe some tinkering will reveal the nature of their operation.

[KrazyEd]

The speedometer is able to be calibrated by way of the dash, nothing outside needed.
If you have programming access, either by way of Factory, or, DigiNow Dongle, then,
you can change the tooth count in software, but, I believe you would still need to
calibrate via dash after. It's been a while, but, you hold down both buttons and go
from there. Instructions should be available here with a quick search. I did my
2012 XU and my 2013 FX. Both ended up being almost exact over a 20 mile
know range ride. They are generally 2% to 4% optimistic from the factory.