If the starter was left 6V, as they often are, any 12V battery should be ok. Just be careful on length of time cranking, the shorter the better. 6V starters are great when run on 12V. If the old battery works well when charged there's no need to upgrade.
Re: 651 12 volt battery in reply to mgriff543, 01-03-2013 17:25:13
The battery does seem to crank it fine, it just seems to go dead quick. I try not to let it crank to long. So I should just get the same part number that is in it now? I was hoping to find the exact correct battery size that a 651 with a 12 volt system should have. As far as I know, this one could be correct, but there is no reference that I can find online on which battery it should have.
Re: 651 12 volt battery in reply to JLadd1113, 01-03-2013 17:33:46
Would you believe since it is a 12 volt conversion there is NO CORRECT battery for it since it was made factory wit ha 6 volt battery. What you need is the biggest battery that will fit in the battery box with the highest CCA you can find. That is about as correct as you can ever get. But before I just took the old battery out I would #1 check the system and make sure it is working as it should as in charging as it should. With it not running the battery voltage should read around 12.3 volts on a VOM and with it running around 14 volts. If you do not get either then have the battery load tested first then the alternator.
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