Thanks for your info. The only thing I can think of is that the gears may be a slightly different diameter which would make the various tooth counts reasonable. I have not found any info on the diameter of the gears so I am just guessing on this
I am looking to replace the starter on my Case 580c backhoe. The unit on it is a Delco #1109149. I see in a parts catalog that this machine also came with a Denso starter #028000-5880. The Delco unit should have a 10 tooth gear and the Denso unit has a 13 tooth gear. Same flywheel on engine for...