T120 Long Term Storage

We’re a fairly analogue bunch on here but I am confident the rational answer to your query is ‘not a lot’.
If you think about it, the bike was electrically dead during assembly right up to the point the battery was fitted. The ECU is partly a memory device so you won’t lose the embedded tuning map and it only reads lambda sensors when it’s running. You are quite safe to remove the battery and put it on the tender.
Cars are a bit different with security, radio codes etc., and I dare say you might lose any old hidden fault codes - unless they reappear on start up they weren’t causing you any problems anyway.

 

It’s a stiff walk. Just got back in from a local circuit with the wee broon dug and we are pooped!
The lambda sensor is the thing sticking out of the RH finned header flange that reads oxygen content in your exhaust gases and constantly tunes the fuel/air ratio I.e. your fuel injection.

 

You worry too much! The most important data is stored in a non-volatile memory. In any case, the battery must be connected to the charger during this time, if one doesn't want it to turn into a "lead sulphate collection box". The motorcycle should be fully refuelled beforehand and the oil level should be just below the maximum. Last but not least, an insider tip, before the last refuelling, pour a small sip of two-stroke oil into the tank, which preserves it and protects against rust by condensation.

You want to know what a lambda sensor is? Then read here!