All depends if you can turn your regulator up to charge at 9 volts. Some 6 volt setups can just barely do it, and some cannot. Depends on the model generator you have.
We used to install quite a few 8 volt batteries at our dealerhip - 30 years ago. But, now adays - at least where I live, I can't see where it's worth it. 8 volt batteries are a "specialty" and tend to be overpriced.
12 volt batteries much more common. If I were going to make a change for better cold starting, I'd stick a 12 volt battery in there and be done with it. A 12 volt battery, if sized correctly, will spin your "6 volt tractor" at zero degrees almost as fast as it turned at 70 degrees F with the original 6 volt . Any lead-acid battery loses 1/2 it's power at zero. So, if you have twice what you need when its warm out, you do pretty well when it gets real cold.
If you DO buy an 8 volt battery, make sure it's sized right. A small 8 volt battery that replaces a big 6 volt battery can wind up cranking worse in cold-temps instead of better. The nominal voltage means little. What counts is what your voltage drops to -when you start cranking. A big 6 volt battery might only drop to 5 volts when cranking, and a small (undersized) 8 volt battery can also drop to 5 volts when cranking.
Check your cranking voltage. If it's dropping to 4 volts, you can get a pretty good gain just by using a bigger 6 volt battery.
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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