The output of a genny is increased EITHER by turning it faster ORRRRRRR pumping more amps through its Field windings, but thats what the VR regulates. Since you cant spin it faster (unless you change pulleys) the VR is what regulates the Field current buttttttttttt even if you by pass the VR's regulation by dead grounding the gennys FLD post (max charge) then youre up against the gennys max unregulated rating which, if exceeded, (say you make it pump out 25 versus 20 amps) may eventually overheat n damge the fields or armature !!!!!!!!
The limiting factor is the gennys rating and heat dissipation capacity so say you use a smaller genny pulley and dead ground its field sure you may get more out of it butttttttttt for how long before its toast??????? If you wanan get less drastic you might try n adjust the VR's field current control relay (air gaps and/or spring tensions) but im not into advising that over the net, Bob or Jim might be able to, I have like NO specs or data here.
In the meantime,,,,,,,,good tight non glazed belt,,,,,,,good non dished out pulley,,,,good battery and grounds and connections,,,,,, are my best non fool with the VR advice
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