Flywheel should be fairly easy. Heat is your best friend here. A little PB blaster doesn't hurt any either. Undo the nut and start heating. Be sure to keep your torch moving, and watch out for the crankshaft itself; don't want to heat it up too much and ruin it. Many people simply hit the crank end with a rubber mallet or hammer w/ a wooden block. Doesn't matter as long as you don't screw your crank or its threads up. Sometimes it'll come off quite easily, but other times it'll be a pain.
When they're really stuck on there, this is what I've done in the past:
I assume the flywheel, like everyone I've seen, has threaded holes in it for the starter pawls or for removal. Put some long bolts in there and give them several turns in each. What I do is take the vice and clamp these two long bolts in between two wood blocks. I align the two bolts vertically equidistant from the center of where the vice's pads are (basically so both bolts have the same clamping force). Then take a drill and drill out the wood where the crank is (normally dead center where the pads are) so I can get a brass rod in there to hit the crank. What you're doing here is holding the flywheel stationary with the bolts and the vice, and pushing the powerhead away from it by hitting the crank. When I use the rod, I put a nut on the crank end, but not all the way on or flush. Let the nut take the beating and not the crank end.
If you want, let me know if you need me to take the flywheel off of my 55 and take pics of the process.
Matthew
