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Aside from the performance and change of physical shape are the gen2 and gen3 motors basically the same construction? Regarding casing, shaft, rotor, bearings, encoder, etc. Or are they wildly different when opened up.

A dealer can reset the odo to the correct value, and we are supposed to check when doing the gearing change.
So that's always an option.

Technically it's an option, just a very expensive and inconvenient one.  The bike is in New Zealand and there are no dealers here.  Would be cheaper to buy a new MBB and dash and have it configured before shipping.

Was thinking about dumping the EEPROM and finding the MBB and dash odo values in memory, I recall reading some details of where things are in memory.  Once located execute some "eeprom set x y" commands to write the correct values back.  What do you reckon?

And where should I upload or send them?

I would also love a copy.  Could you upload it to my ftp server?  If so I will PM you login details.  Could then make it available to others in this thread.

Fitted a Lunacycle wide belt kit to my 2016 SR about a year ago and the ratio change causes the speedo to read +15%.  Recently found "the one" MBB console login password that gives access to change the spfront and sprear values.  HORAY!  I can fix the speedo.  So I did.  But changing spfront completely screwed the odo reading with the accompanying log entry...

INFO: Dash ODO 75806km > MBB ODO 48010km.  Setting MBB to 75806km

What this log entry omits is the dash odo was also set to 109553km.  So I attempted to Ctrl+Z that by changing the sp counts back to their original values.  Which made it even worse!

INFO: Dash ODO 173008km > MBB ODO 109653km.  Setting MBB to 173008km.

Dash now reads 173008km.

I don't really care what the odo reads and if I ever come to sell the bike it's easily explained by the console logs.  But it screws up some stats I enjoyed e.g. lifetime watt hours per km.

How do I get the odo(s) back to their original numbers?  I have the numbers in log files and photos.  Had a search of this board and found a post claiming the dash odo count can only go up, and another post claiming their dealer reduced their dash odo value.  Any help would be gratefully received!

Follow up question, wtf is up with those logs?  The same event (spfront value change) causes the entries, but the numbers in the second entry are apparently muddled?  First entry "Setting MBB to 173008km".  OK, so how does result in second entry "MBB ODO 109653km"?  That's the value from the dash.  Feels like a software bug...