Kubota M6800 4WD Engine

/ Kubota M6800 4WD Engine #2  
Does it have a turbo? A minor increase in cylinder volum will only empty your wallet.
 
/ Kubota M6800 4WD Engine #3  
I think I'd "turn up the pump" rather than increase bore.
 
/ Kubota M6800 4WD Engine #4  
Increasing cylinder diameter will do nothing for increasing power unless you add more fuel. Most HP increases on diesel engines come from changes in the injection pump (timing, fuel delivery), and/or turbo modification.
 

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