when i put a GSX1100 engine in my 750ET i checked the compression and wasn't great but all where equal, it even chuffed a bit of smoke out on cold starts now and then, I know the engine had been stood for a long time, but after a few 100 miles the compression has increased to over 140psi and it seems to of stopped chuffing oil out. it also runs better than it did when i first got it.
food for thought.