My Jubilee and Farmall C both were converted to 12v before I bought them. Both sheared off starter drives in the winter. Both have rebuilt engines, excellent compression.
I dug out sheared off parts from bell housing of Jubilee form about 10 previous broken drives. My final straw on the Jubilee was when it broke off the face of a tooth on the starter ring. That's when I invested in a new 12v starter instead of overpowering the OEM 6 v starter.
I wasn't able to find a 12v upgrade starter for Farmall. That's when I decided to take my oldest and weakest 12v lawn mower battery and under power the 6v starter. Farmall has a mag, so that wasn't a big issue. Been using the old mower battery for 4 years. I think the battery is 10 years old too.
One problem people don't think of when going from 6 to 12 v is changing coil to 12v or wiring a way to bypass ballast resister during cranking.
No way would I want to use 6v starter on 12v. No way would I want to find a stronger starter drive and take out more teeth on starter ring.
So if you are don't like the slow cranking 6v battery, change to 12v. Go the extra expense and change starter too. About $150 from YT. I love my 12v starter every time I start the Jubilee and I bypass the ballast too during cranking. geo
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