Quick question, so yesterday I was talking with my dad about cars (topic actually started as whether or not to sell my car while it still has some value in it to get a 900SE). The conversation quickly moved into some problems I think may pop up in the near future. I brought up my timing chain. Turns out the mechanic that he goes to owes him some pay from a general contracting thing my dad did for him, so if I'm uncomfortable will doing the timing chain, this guy will do it. My question is this: while doing the timing chain, I would think it prudent to replace the sprockets too, but with just a master link chain going in, only the camshaft sprockets would be accessable. Is it even worth replacing those two while leaving the lower timing chain sprocket as is? Do one of the two areas (lower sprocket or cam sprockets) wear more quickly?