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        Q: Inherited a continuous 12.5 kw, 1800 rpm, 240 volt, single phase, 60 hz generator that requires 25 hp engine?
A: As a rule of thumb consider about 8y percent effectiveness of mechanical transformation . So , the rated KW will be 126/0.8 = 157.5 , say , 160 KW . Check that the rpm of motor and pumping should match . 

Q: What is the relationship between rpm of a shaft, generator & voltage produced?
A: no , the motor might work as a generator , but with low efficacy ... it triumphed ` t give 12V output at this rpm ...  be utilised as a generator is required to heavyly amend ... .  you are able not use theory here , you are required experiment and see the results ...  good luck ! 

Q: Runs rough at low RPM and fine above 1400 RPM. How can you find a vacuum leak on Mark VIII engine?
A: A 2003 Mercury 115 that runs rough at a low rpm maybe it is having aproblem with the MAP Sensor or the Oxygen Sensor . The MAP Sensor isgoing to be the easiest one shall be substituted for since it are generallylocated plugged into the EFI ( Electronic Fuel Injector ) , a fancywould for carburettor .