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 ? :unsure2:
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 ? :unsure2: