Just had valves checked at 33.550 mi. tech determined they had never been adjusted because he stripped out one of cam bolts and indicated it had never been taken of before. Anyway, intakes were right in the middle, but exhaust were at the edge of loose end. Have read that aggressive riding tends to tighten valves, while babying tends to loosen. previous owner said he never exceeded 9000 rpm. My question: do you think aggressive riding will improve, do nothing, or worsen exhaust valve tolerance?