Jeff, If the motor isnt dragging or been siezed up or has problems that make it hard to turn, then the problem about has to be either a defective starter, or a defective starter switch, or a weak battery. Can you try using a different battery or batteries or jumping yours and see if she still cranks slow?? If she has good rated and clean tight cables and connections, and different batteries still crank her slow, then I suspect a bad starter or bad starter switch. Do you have 0 gauge battery and ground cables (12 v system) and all connections and grounds clean and tight?? or 00 Gauge if its a 6 volt syatem?? if you have very small cables, that can be a problem. If any different battery or batteries or jumping still cranks slow, I would first remove the starter switch and see if its burned or pitted or carboned up and clean and wire brush or replace it, and if the starter post is burned down or all pitted, and cleaning and wire brushing or filing it smooth still doesnt make her crank any faster, it may need a new or repaired or rebuilt starter. Weak or underrated batteries or bad battery or starter or ground cables or that switch and any or all can cause slow cranking, assuming the engine is free to crank as normal. Good Luck, Ol John T Nordhoff
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