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Couldn't find anything on that model number other a control box.
Assuming your in the USA output frequency would 60 hertz under load so 65 hertz would be find; although, engine is running close to 3900 rpm when it should be around 3750 rpm unloaded which would be 62.5 hertz. As the output voltage being low it is probably the AVR (automatic voltage regulator) that is the problem.
You cannot adjust the voltage output. All generators are rated for 110-125 volt recepticals and usually have at least one 220-240 volt receptical for special appliances that require it such as water heaters, pumps, welders, air conditioners. When one of these higher draw appliances is connected and they begin to draw amperage, the gas engine will automatically increase rpm to produce enough amps. If your generator gauge is showing low voltage such as 60,80 or 90volts for example, then you have overloaded the generator and blown a capacitor, resistor or similar item.
I am not familiar with this make of generator, however I am thinking that voltage regulation and rpm are tied together with this unit. The generator MUST have an output of 60 hertz. This could be 63 hz (when the load comes on it drops to around 60). If the frequency is NOT at the above specs you will burn out anything with a transformer or motor. Now this translates to around, minimum of 3600 rpm on the engine. If you have access to a frequency meter (a kill-a-watt) you can set the speed. I found it best when using the kill-a-watt to use it with a minimum of a 10 foot extension cord. Set the throttle speed so that your frequency reading is 63 hz. If this is the non electronic voltage regulated type of generator, the voltage should come up to around 120 volts and the frequency should be at 63 hz.
You can think of AC power as a sine wave. It goes from 0 to its peak, back to zero, to its negative peak, and back to zero. This is called a "cycle". Your generator puts out a certain voltage (probably 120/240) at a certain "frequency" (probably 50 or 60 HZ). 60 HZ (hertz) means that 60 "cycles" happen each second. Essentially, in one second, voltage falls to zero 120 times. So all lights flicker, even when connected to the utility (just so fast that your eyes can't pick it up).
With that said, how evident is the flickering? Are these lights incandescent, flourescent, HID? How many watts (or kilowatts) is the generator rated to output; how much power is being drawn?
Most of the small portable generators will depend on the engine speed to
regulate the voltage. If the motor is at the correct speed you are getting 120 volts 60 hertz, if not it will read lower like 115 volts 55 hertz or so. This can be fixed by adjusting the governor, or idle speed needle.
According to the parts pdf, there is no voltage regulator. Voltage is adjusted by the rpm of the engine. If your have a meter that reads hertz (Hz), you can set the engine rpm by adjusting hertz to 60 cycles (Hz). At 60 cycles the engine is running at about 3600 rpm. Most engines develop their max horsepower at this rpm. If you are loosing power/voltage and the engine speed is not dropping below 3600, than most likely could be problem with capacitor, brushes or diode (bridge diode). The diode converts ac voltage from stator to direct current to power the magnet (rotor). Check for brush wear and test capacitor for value printed on part. It should test with 5% of stated value. Diode can also be easily tested with meter. Good holidays
Most low voltage conditions on generators are simply due to a low engine rpm. Most modern generators are 2- pole windings. So your engine rpm should theoretically run @ 3600 rpm. which will produce 120/240 volts @ 60 HZ. In actuality You want to set your rpm's @ Approx. 3720rpm no load. About 62.5 Hz. Without getting to technical this will give you your desired 120/240 volts loaded. Hope this helps.
check for a circuit breaker that is tripped, as well as a switch that enables 240volt (at the cost of 120 volt current being cut in half.). The switch puts the alternator windings in parallel (120volt full power) or series (240 volt @ half 120volt current).
I worked at a tool rental center while going to college and learned how to service generators. Most appliances/tools require 50 to 60 cycles at 110 to 120 v. Your engine was designed to give maximum horsepower at 3600 rpm. Adjust the engine speed to produce 60 cycles and the engine should be at 3600 rpm and producing around 120v max. (Some special generators were designed to produce 230v 180 cycles, check manual) If your generator incorporates capacitors check them for at least 95% of printed uf value. They should be removed from circuit for testing. If there are two caps and one is weak make sure the new cap reads close to value of remaining cap. Finally there is usually a voltage regulator that varies the power to the armature magnet trying to maintain steady voltage depending on amp draw and engine condition. This regulator has no adjustment and is pass or fail type of item. Good luck, enjoy