Am working on the motor out of the 101 sr, when I tore it down didn’t look bad at all and I drove it into the shop, didn’t sound bad either! Crankshaft bearings looked good hardly showed any wear, all are standard!! Crankshaft shows wear, mics right on boarder line!! Been trying to decide what to do, have crankshaft turned and buy new bearings, about $300 additional, main bearing set over $170!!! By the time I put new rings and full set of gaskets ( 1 new connecting rod due to bad wris I was a mechanic by trade so this isn’t a fly-by-the-seat decision and it’s really hard to convince myself “it’s just an old tractor” that will be lucky to run another 100 hrs and no work so it’ll be okay, not used to doing things that way whether it was for myself or a customer, hard to start now!!