When a load is put on my Powermate ATG 5700 the RPM goes down by 80. It won't speed up to compensate. It's like new only 15 hours on it.

All the above is normal , except 2000rpm is a little high at idle . can be adjusted down to 1500rpm. the computer adjusts the engine speed . in drive the transmission loads up the engine idle drops to 1000rpm . in park engine unloaded rpm increase all normal.

Check to see if you model has a puel pump, f it is a Brigge & Stratton 10 hp I am sure it does

Idle control comes into play when there is no power draw forcing the engine to idle with an electro magent. If you feel that the electro magnet is interfering with governor, temp remove the wire to the solenoid. Usually the idle control will not effect how the engine /gen output power. An overloaded condition will cause the engine the go the full throttle as the internal governor of the engine will try to maintain 3600 rpm. Overloaded condition will greatly shorten the life of the generator/engine. Try to use only about 80 % of rated power. Large motors can draw three times running amps. A compressor using 12 to 18 amps to run can draw over 40 amps to start.
If your generator could handle the load in the past, check the engine for loss of power, or the generator for faulty voltage regulator or capacitors out of range. Easy to check. Connect digital volt meter to plug /load and look at volt reading while running with no load and loaded. Voltage should stay between 110 to 120 under load and with no load (unless goes into idle mode). Good luck

its possible the overspeed is set to sensitive. or your rpm are to high. these are preset in the factory as a safety, check your manual to ensure your rpm speed is in the pre set area. generators will do this under load when you have a big load on them or take a load off. the governor will some times over compensate causing it to trip on overspeed.

The normal idle speed is below 1,000 rpm...between 800 to 900 rpm. I suspect that the idle-air control motor has seized and can no longer automatically adjust the engine's idle speed. This part is also responsible for slightly increasing idle speed when the airconditioning is switched on to compensate for the added engine load. Some cars even have a "step-up" solenoid to increase idle.

When replacing the idle-air control motor, remember to clean the port that IAC motor goes into; there will be some carbon build-up that may prevent the part's cone-shaped valve from seating properly. A can of intake valve spray helped along with some Q-tips works well.



Hope this helped.

Have a great day !!!

You don't need a dealer. Where did that come from?
Go down the street to the nearest repair shop

For some reason people think that the oil goes bad in 2 weeks because it is a small engine, but if you compare 3,000 miles on your car to hours, you would never change the oil in the generator. I don't think I have changed my lawn tractor oil in 15 years, and it is still clear, never broke down, because in 15 years, I've probably run it, 150 hours? It's about due. I hope this helps.

govenor problem maybe does the engine sound slower when a load is on.
you will need something to read the power frequency

3000 rpm produces 50hz uk
3600 rpm produces 60hz

so if you have a meter to measure frequency you will also know what speed the engine is running at

soud like an engine management fault
or a more complex avr does it have an electronc govenor

set at 3600 rpms at 60hz