If it turns over really slow that's not compression, that's the starting system.
Probably two things:
1) You may need to get the starter refurbished. Kanter and Max have rebuilt starters, or these guys would do it:
Buchannan Auto Electric 2) You probably need to clean all the connections. 6 Volt systems are really sensitive to having a good ground. This includes the big red ground wire (preferably 00 or 0) that goes from the battery to the block.
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