That stinks. I thought that engine (confirm but propably a Mahindra NJ-385) was used in several brands of tractors. E.G. Jinma & Tractor King.
Might be able to find a used Jinma for sale cheap with a good engine.
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Can't help you much with the engine search. I "think" that engine is used in a LOT of applications and it's in a lot of tractor brands. Was wondering if you could find a tractor that's whole or parts that still has a good engine.