Ok one last thing lol. The 12hp I have did not come with the drive cup(?) and I don't think the I have will work properly on it.
https://i.ebayimg.com/thumbs/images/...EGY/s-l225.jpg
This Is similar to the flywheel on the 10hp
https://m.ebay.com/itm/CASE-224-444-...28.m4335.l8656
And this is similar to the fly wheel on the 12jp. Can't find the right part anywhere so if anyone could point me in the right direction it would be greatly appreciated!