mine was purchased off from the fist owner, who rarely rides and over the years in his possession he´s only travel over 600 miles. I am only used to Japanese bikes, and this is my first harley, and she sounds a bit rough and loud while on idle, as well as riding. The first gear always sound loud as well and in between 1 & 2. Is it normal? Plus what sort of engine oil would work best? and when changing do I need to fill into transmission box as well as the engine oil tank?