Its been a long time since I have replaced mine. You can check it by setting the motor at tdc and removing the bolt in the back of the acct and then remove the acct from the head. Inspect how far out the plunger is. If its all the way out the can chain is stretched.
If I recall when I replaced mi e I had to remove the clutch basket and the crank gear. You have to be very carefully when putting the clutch basket back on cause of the plastic oil pump gear. If the gears aren't lined up and you tighten everything up it'll damage the oil pump gear and starve the engine for oil. I remember the job east hard and it only took me an hour or so but I'm also a mechanic for a living.
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Cape Coral, Fl.
2005 Buell XB9SX
2003 KLX400R tagged