Further Derbi adventures

Damn Derbis. So I have the spark all straightened out. Now I it still doesn't run, and will pop a little if I spray ether into the spark plug hole. I think it has bad crankcase compression. When you turn over the engine, it doesn't make that sucking sound from the carb. I took off the amnifold and put my finger over the intake while i pedaled, and it seemed to draw air weakly. Can anyone with a Derbi confirm theirs is like this? Other than replacing the base gasket and splitting the engine to replae the case gasket, why can I do to fortify base compression?

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