Coleman Powermate full throttle

check that you have the governor control rod on the butterfly lever of the carby connected correctly
it appears that the lever is at full throttle when you connected it and so the governor cannot pull it back to correct speed
if correct the throttle will be at full speed when stopped but will move with the go lever to slow when you manually push the gov lever

Its is a governor or fuel issue. Start with the fuel make sure all and carb is set correectly and tune dup. Then check the governor. Make sure also you have correct weight and viscosity oil and level

It sounds like the governor arms internally are broken, can you feel any resistnce? if not then it will need a tear down to fix

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

The engine on your generator is also used for other applications some of which require an adjustable  throttle control. On a generator the engine must turn about 3600 rpm to obtain proper output of voltage and cycles. Upon further inspection of your throttle/governor you will probably find an adjustment consisting of a screw, nut or a tab on one end of the governor spring that can be reset for proper engine speed. (tab can be bent for more or less tension on spring) To check present governor setting, use a volt meter that has frequency setting. Make sure that generator is set to about 60 hz. (3600rpm) Good luck with your generator.   

there 2 linkages that conect that would be the problem. you have on conected to the throttle switch that runs to the govener than on that govener os another linkage hooks up to it and runs to the carborator that ajusts the flow. if you don't have both linkages than you need to order 1.

I had a Colman that only surged when it had a large load on it. ConsumerReports.org says that some Coleman generators just can't hold a constant voltage. Hondas are expensive but very good,.

Hi there,
Check the air cleaner to make sure that it isn't clogged with oil. If you find any significant amount of oil you may also need to clean the carb. Also check the spark plugs for fouling. Once you're convinced that the engine has no service related issues, check the governed throttle setting. To do this find the spring that pulls on the governor arm and look for either a tab to bend up or a threaded rod to tighten at the end of the spring not connected to the governor arm.
Regards,
Carl

Where can i obtain a manual for the 5500 gas generator

This is almost surely a problem with the governor, check it like this.
Have someone with a finger on the kill switch.
Watch the governor arm while starting the engine, if it does not move almost immediately after starting the engine it is broken.
This is not a simple repair as it involves taking the crankcase apart, you'll have to contact robin/subaru to get a parts list in order to get the right governor spool and weights.
For an experienced technician this is about a 2 hour repair task.

Hope this helped,
Carl