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have you turned it upside down, blocked it for support and tapped the case studs (with a nut covering the end to protect the threads) while gently lifting the bottom half of the case (now facing up)? On the stubborn ones, it might be helpful to have someone else take the weight off of the top case while tapping the ends of the studs. Rotate tapping each stud similar to the pattern of tightening the head nuts. It will go...
What Mr Von Yinzer is saying is that if there is a lug on the back or front of the cases that's designed to be levered, then go ahead. He is not suggesting beating a steel wedge between the cases and causing all manner of permanent damage.
Heat really helps to break the seal. Gray sealer is 3 bond, red or brown is aftermarket goop and a warning sign of problems ahead.
Rubber mallets are good but sometimes it's necessary to use a wood block and large hammer but be careful. Things break easily in there.
Look for a leverage point on the cases. On the SOHC 750 you can flip the cases up side down and use the out put (drive) shaft as the leverage point with a large screw driver. Before you start to pry on the cases triple check that you have all covers off and all bolts removed... The bond should break free pretty easily.
honda put small ledges on cases, where a small ledge of one side hangs over the other side, if you use a plastic hammer on the ledges, the cases will pop apart like someone made them for it... someone did
TAKE OUT ALL THE BOLTS AND NUTS!!! you can leave several bolts(larger the better) evenly spaced around the engine and tap on them for some help along with the other suggestions............big thing with this kind of job is knowing when to stop, sometimes there is a fine line between taking it apart and ruining it. joe