How tough of a job is it exactly to change the HLA's in the 1600's? Do you need to remove the cams or mess with taking the engine out of it's timing. Anything I hate is to mess around getting the cams back correct in time in a bike engine. Had to do it a couple times on my Harley Sportsters but never did anything like that yet on these Vulcans. Just give me a quick run down from start to finish of what needs to be done to get to them and change them out.