White LT125- B&S motor question
I have a lawn tractor, (white LT125) with a Briggs and Stratton 12 HP 281707-0411-01 motor on it. The motor essentially blew up about a week ago, and I was hoping for some insight on a replacement. I checked with a local small engine shop and he told me that the motor is obsolete and that the newer version would be $800, plus labor to install. Surely I should be able to retrofit a used motor for a fraction of the cost, but it's unlikely I will be able to find that exact motor. What do I need to look for to replace this engine and get my small tractor running again.
Note- By "blew up" I mean it sounded like a 30-06 went off and the motor shut off, and I noticed a crack in the block, with oil seeping out. I am very new to small engines,let alone rebuilding one. I'm just to cheap to pay $800 to fix a $200 tractor. And I would love to learn and fix this myself. Thanks for reading.