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Engine should run at 3600 RPM, with a load on a generator. this is to provide the correct voltage, and the correct frequency. Running it at an idle will have the frequency low and the voltage low. End result will be expensive damage to items you plug into the generator. Some older units do not increase there engine speed with a load applied. I've not seen that feature on many Coleman's, but that doesn't mean it doesn't exist on yours. There should be an electric solenoid of sorts connected to the throttle linkage if it does have it. I have a powermate 4400 with an 8HP Briggs, and it doesn't have it, Mine was made in the mid to late 80s. I'd have to look at the engine to get the exact year. those that don't have it, run at 3600 RPM, constantly, with or without a load. Before tinkering with the RPMs, get a tachometer.
you can adjust the rpm to get the voltage at about 120 using a volt meter, but I still recommed the tach as well. If there is a problem with the generator itself, its possible to overspeed the engine to get the voltage right if you use the voltmeter method alone. there are a couple ways to adjust the governor on a Briggs. having the service manual would help. First, there is the static method, done with the engine off. You loosen the clamp on the governor shaft, and push the linkage to full throttle, and turn the rod clockwise or counter-clockwise (depends on the engine), then re-tighten the clamp. After that, you do one of the following, these are usually done with the engine running, or with it off, you make the adjustment, then re-start it and check it again. I do it running, and am careful not to put my fingers or tools into moving parts. There may be other methods on some of the newer engines. Some have a threaded rod, with a thumb screw on it, usually points up, on top of engine, near the carb/air filter. Turning that screw can increase and decrease the RPMS. Some have a tang that the governor spring attaches to that must be bent with a special tool that you can make yourself, instructions are in the service manual. While you are there, make sure the governor spring isn't stretched out or damaged. If it is, get the right one, using the model, spec # and serial # for your engine. Not all Governor springs are the same. you can look it up online yourself if you like at Briggs and Stratton's web site. You can also order a service manual and tachometer if you want to. Any Briggs and Stratton delaer should be able to get you one and help you also.
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