It's the long-serving Kubota motor.
They have been around a while, so there will be plenty of bits around for them that were used for fork-lifts, generators, and so on.
This is so important in the long term, as the engine supplier cannot charge too much for the parts, as others, Volvo being the worst for me, try to.
If Betamarine try that one on, just find the bit that's broken from a fork-lift supplier, or similar.
The exception will be the marinesed bits, but do they fail often? I wonder.