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Huh? I've seen conflicting reports on what the MT654CR can handle, but the highest I've seen is 300HP/950ft.-lbs. posted here on SS. Do you happen to have a source for the 425hp number?

We are definitely talking about two different things. The idle-speed screw is not under the hex cap. It is just aft of where the throttle shaft enters the injection pump body, and is adjusted without removing any caps from the IP.

I'm curious why you would adjust the idle screw with the engine off? We may be talking about two different screws. The one I'm talking about limits how far back the throttle lever can travel through mechanical interference, and I see nor found any particular reason it can't be done with the...

You are correct. Break the jam-nut loose first, then loosen the flathead screw to increase idle speed. Tighten the nut back down when done.

Something else to consider is making sure that the throttle lever on the pump is being run all the way forward by the throttle pedal. On mine, the small spring on the pump lever was fighting the spring on the throttle rod preventing full-throttle operation. I removed the small spring and put a...