Just looked at the wiring diagrams and the mk1 doesn't have the white wire, strange that the learner mode wasn't introduced until the mk2 came out. Mk1 is a lot smoother at low revs though. 
Do you know if disabling it has improved the bike at all ? Or is it possible that the replacement carbs have made the difference you mentioned ? 
It's definitely made a difference. I disabled it lastnight and got 20 minutes on it this morning, before changing the carbs
One easy way to check if it has already been disconnected is the next time you take the left side panel off, disconnect the 6 pin plug (only 4 wires wired into it) from the ignitor, and check with a multimeter in resistance mode for continuity between the white wire terminal of the plug and earth of the frame (battery negative)...If it has been disconnected there should be no continuity to ground shown when you move the gear lever between neutral and 1st gear
The mk1 doesn't use it, but it has very simple ignition, less to go wrong with it, but without a throttle position sensor the timing cannot be advanced when you crack the throttle open in response.....mk1 timing is only advanced relative to engine speed
Ohlins, PC3, fuel cut defeat, +4deg timing, 17" front wheel.