Honda Em5000 Generator

I have a problem with My EM 5000s honda generator frequency output which I think is related to RPM. Last week I used a computer to set the RPM on my generator to 3610 RPM because my solar system inverter showed the generator frequency was low. After setting the RPM the frequency was 59-61Hertz. Now the generator frequency is running between 53 and 57 especially when it is under heavy load and running my 1 HP submersable water pump.
I'm not sure why the frequency won't stay constant under load.
Can any body help me .
Is it possible my generator my need to be rebuilt. It has a lot of hours on it.
Thanks in advance
GaryM

 

Hello Gary!

Look at the throttle linkages from the choke to the carb. Check for loose fit, loose shaft in the carb, etc... and correct any spots with excessive wear. Check valve clearances. For some reason, your engine rpm isn't staying constant. Probably not enough that you can detect the change by ear, but enough to change the frequency.

 

Where you able to resolve?
I have a Honda 6500, same problem.

 

AVR (automatic voltage regulation ) is incorporated in many Hondas. not sure about your particular model, but and EM5000 S/N EA7-2000001 and up.
part # 32350-ZB4-632

 

Honda generator AVR modules control voltage level.
Frequency (Hz) is determined by engine RPM.
Most 2 pole gens must spin at approx. 3600rpm to produce
the required AC frequency of 60Hz
The Honda engine RPM on many models is controlled by a mechanical governor system with both external and internal engine components.
I recommend changing external control springs as a first course of action. Springs stretch and weaken over time.
If changing the springs fails to resolve the problem, the next
step is to change internal parts that may have worn out.
(i.e. governor gear, slider)