Re: Merc 850XS flywheel puller
You should be able to use a harmonic balancer puller for that flywheel. Those are found at most automotive parts stores. Also, since they have the "W" machining on the crank end, they do not have too much taper and are easier to pull. Put a few drops of penetrating oil on the crank, before attaching the puller, and give the puller a rap after you tighten it.