Generac GP8000E generator problem

[Arkie]

Is the load you are applying a resistive load?

About how much KW load can you apply before the Hz drops below around 58 to 60 and when it does what is the voltage output.

Here is a Generac link for little bit of info.

I do not see a actual service manual for that unit listed anywhere.

Did you have to make any changes to the valve lash to get it within specs?