How bad is too bad? I'm about to pull the front end apart so I can pull the crank down to do the rear main seal (someone talk me out of this!). Following the thread on the rear main it looks like the chain has to come off so the crank can get pulled far enough to clear the rear seal.

Anyhow - if I have the chain off, how do I check it? With American chains I hold them sideways and if they droop more than a little (say, 1 1/2 inches max) it's time for a new one. Is there a similar test for the M-B chain?

Dan