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The blue smoke would concern me also that the misfire stayed with the hole and didn't follow the injector if it were mine I would drain a small amount of oil out the drain plug its a little messy but if you do it with the engine cold its not too bad pull the plug collect about a 1/2 a cup put the plug back in so you don't lose all the oil then check the oil for small chunks of metal or metallic flakes if there is metal present then something going on with the mechanical part of your engine broken rings or piston or when the engine/tractor was assembled some careless person left some debris on the intake side which got into the engine and caused some damage I hope not as this can be an expensive repair.
I check the fuel system for sucking air I'd inspect the suction side of the fuel system that's from the inlet side of the fuel pump back to the tank that's the suction side of the fuel system just a minute leak can introduce air and it will cause the symptoms you are describing. This could be caused by just a slightly loose banjo fitting or a not very good quality Chinese rubber fuel line that has deteriorated .
I had the same problem on my 07 284 I just changed that little oring on the check valve that that you removed from the top of your injection pump. I had a metric oring kit I bought from Harbor Freight I matched one up from the kit installed it on the check valve lubed it up with diesel fuel screwed it back into the pump leak went away that was 2 years ago and that was many hours ago. I wouldn't change the whole pump it not necessary.
If you give those Jinmas a little love they will certainly due a days work for ya won't they
It my experience Jinmas compared to Ford ,John Deere or a Kubota are not very forgiving don't misunderstand me for the price you can't beat a Jinma I have found if you give them a little more grease keep a little closer eye on the fluid levels bolts have a tendency to come loose a little quicker fluid leaks happen more often they just need more love is all. I remember a friend of my grandfather had this Ford tractor he had it parked out behind the barn had the coffee can over the exhaust only problem was during the storm the wind blew the coffee can off the engine got drowned and was locked up about 2 weeks went by before he noticed what had happen they drug her into the barn fired up that pot belly stove thawed her out removed the spark plugs got the water out of the cylinders poured kerosene into the cyinders changed the oil she fired right up smoked a little the 1st hour plowing snow but after that it ran for years. That's forgiveness let the same thing happen to a Jinma I seriously doubt you would get the same result.
I'm sure one of the dealers would gladly sell you a new engine at a nominal cost. The one thing I've learned about Chinese tractors and equipment is they require more maintenance and a lot more love as they are not very forgiving . Leaving a Jinma outside all winter in the harsh conditions its going to take a lot of loven to get her to forgive you.
