The 6 volt systems didnt crank over at any real fast RPM to begin with (depends on temp of course) but if the battery is stong and a heavy rated unit and you use 00 gauge Battery n Starter n Ground cables, a decent H should start okay if the battery n starters in decent shape.
First thing Id do is remove, clean n wire brush, n re attach all battery n starter n ground cables and make sure the battery is good n see what happens and replace the cables with 00 if they happen to be thin and wimpy...
A bad resistive burned starter switch can cause poor cranking also, even if all else is fine, you may wanna take a look at that possibility.
If you only put 6 volts on a 12 volt starter it will crank slower then molasses in January.
You ask "If it is actually a 6v starter, will I damage it with a 12v battery?? "
ANSWER you probably wont damage it (12 on a 6 volt starter) just dont let it crank too long although it can be a bit tougher on starter drives.
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