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I know my little 3 Litre doesn't like key-starting up a steep hill as there isn't enough low down torque to get moving like the 4.2, so I don't tend to try this anymore, but I have successfully done this numerous times in the old 4.2 .... even using the hand throttle to just boost the idle speed a little
Mic
I would say that might be the case with a stock RB30. The small engine has very limited compression and torque.