I am getting ready to change the timing chain on my '03 WR450 for the first time at 700 miles. I have reviewed many posts on this process on this site and several problems that people have run into. My question is - the rotor is screwed to the starter clutch using six screws (which are locktighted). Do these six locktighted screws have to be removed to get access to replace the timing chain. Is it possible to remove the rotor while it is screwed to the starter clutch (and starter gear behind it)? In the service manual, it is not very clear.