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Hi, I recently swapped my IH cub loboy 154 with a kubota D640 3cyl diesel and it does not seem powerful enough. Seems like the governor isn't working. I have put a spring on the throttle lever to return it back to idle. Could that be the cause? It fires up and don't smoke but it just bogs down...

I just bought a Kubota D-640 for $100. Only needed a head, so I put my D-722 head on, and it'll have the D-722 injectors. But how much torque do the D-640's have from factory and how much would it have with the D-722 injectors? (The head fits perfectly)

I just recently bought a d722 and port 1 and 3 are pumping fuel. Center port is not pumping. I replaced the plunger and barrel but it still does not pump. Any ideas? I'm really confused.