To be honest when I fitted mine I made sure it drove fine, engaged and disengaged gears ok ect. Drove it normally straight away pretty much and gave it some beans soon after. (Forgot about bedding in fully)
But if you have been advised I would take the advice as it may void any warranty if not done perhaps.
500 miles seems high but that might just be what they tell customers as a precaution to highlight any possible niggles or faults.
A stiffer pedal was the main difference really
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