Best to remove at least outer tranny case (don't have to but easier) remove jugs,oil pump, oil lines,cam and crank gears, disassemble primary,pistons off of rods (best to pad the rods or be sure to keep them a BDC) If you simply can't get the case split you can VERY LIGHTLY tap the end of the crank with a rawhide mallet but only do this as a last resort.Some times if you can put it in the oven to warm it all up to expand the metal it will loosen them but remember when you remove it from the oven to wear gloves. Also I did mention ignition, timing cover case bolts, etc... since I figure those are obvious. Sitting here trying to picture it in my head and can't think of anything else that you need to remove. You don't have to disassemble the tranny but I do to lighten it up for ease of handling. I also don't warm the cases or tap with a mallet but if they won't come apart you may have to do one or the other.If you tap be very careful don't want to bend anything or mushroom the end where the oil seal to feed the crank is, this end mushrooms pretty easy also don't want to get any dirt in there. Don't forget to clean the sludge trap.
