Minimum REVO Rpm is 3000 unless you have no load on it ( like sneaking thru the old neighborhood at 1 am ) then 2500 is allowable. Actually the 28 tooth is just right for 80% of all average riders - spend more time in the city, mountains, racing ? Go 26 tooth. Spend more time at speed, flat country, touring at higher speeds ? Go 30 tooth. It's just that simple. In any event and as said the engine LOVES to rev, ( for a V Twin ) and like a sewing machine will do so as long as you can stand it, absolutely no problem. Change your oil, 2 years or every 3500-4000 miles and you will not have a problem.