It looks a little twitchy, but it sounds OK to me...
Dropping the connecting rod cap and taking a plasti-gage reading is pretty easy. It will help you get familiar with working on one of these engines. You are probably OK, but hear me now: it's better to inspect before failure than to discover after failure.
Th up-side of these engines and ST generator heads is: you can work on them. The down side is that you have to work on them. You must futz around and inspect / tweek / 'fettle' as they say in England.
If you are good with that, then you have a good 'Post Holocaust' generator that will serve you well.
I have a Ashwamegh "25/2" that had to be completely disassembled, the block hot tanked and needle scaled, the crankshaft polished and everything hand fitted on re-assembly. I'm pretty sure I 'know' my engine now. I've stocked up on bronze idler gear, offset idler gear bolt, spare gaskets and fuel system parts etc. that were offered when this site was very active and special parts were being made and offered by the outstanding members.
This site is a little quieter now, but still 'top notch'. If you keep at it, you will become one of the senior members, and carry the torch for the next generation.