I saw this on Ebay, but didn't look at all the pictures until a few minutes ago. I'm guessing the bidders might have done the same. I know it has a lighting coil/flywheel, and that 631588 diaphragm carb is worth a bit, but who pays that for a blown engine? That's at the top of it's value in my opinion, especially when you consider that the ID/Seria plate is missing.
Rupp Mini Bike Tecumseh HS40 Lighting Coil Engine Motor Vintage 4HP | eBay
Rupp Mini Bike Tecumseh HS40 Lighting Coil Engine Motor Vintage 4HP | eBay