250-500cc powerband adjustment

I’m not too good with the spannering but I’m learning! I was pleased after changing my first piston a month back. However it seemed to take age’s b4 the power band came in.

Not knowing what I was doing I adjusted the teeth under the left side cover and now it comes in immediately! Loved it. Felt like and mx bike so I hit an mx track Sunday and loved it.
However will I damage the bike in anyway? Is this ok? I need to test it now on how it will ride in the technical enduro sections and climbs?
i was amazed how it has always pulled up big climbs with next to 0 revs

I'd like to know about this as well. My first ride on my 00' 250 the arm on the PV had come of and I had no hit of power. I guess you can adjust it without hurting the motor???