A hard break-in simply means you are aggressive with teh throttle and braking which leads to faster acceleration and deceleration. You still have to stay under the RPM limits for respective service schedules. You dont baby-handle the motorcycle. If you are drawing conclusion based on Motoman's breakin method then I would suggest you read it once again carefully.
Also to quote, "the bike becomes a different machine", it really does not. If done right, you get 2-10% extra power out of it than compared to an easy breakin one. This is not noticeable unless you are on a race track and in a race.
Motoman did his tests with large displacement engines. Such an effect isnt well pronounced in a 155cc engine



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