Difficult to say really... They were/are all released with different CO1 settings - not two the same. There is no "default" setting. 20 could well be what it was originally, but it could quite easily have been altered. If your bike is totally stock then the likelihood of someone having messed about with the CO is probably reduced somewhat.

No harm in changing it and seeing if it makes any difference though? You can always go back to 20 if need be...

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