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I disassembled my EM650 Generator and to clean out

I disassembled my EM650 Generator to clean out the fuel tank. After reassembly the generator ran with a higher RPM and has an unregulated voltage output. I tested the voltage with a Fluke volt meter and it showed 240 Volts+ then lowered the RPM and it then was putting out around 119 Volts. It seemed to vary directly with the RPM. Is my voltage regulator cooked?

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Most generators (except the latest inverter generators)
produce power directly dependent on RPM's.
The governor adjustment is critical.
This usually is in the form of an adjuster that through a spring, applies a preload to the governor arm.
The governor arm is attached to a shaft that disappears into the motor. Inside there is usually a set of weights that when spun faster will attempt to slow the motor and when spinning too slowly will attempt to increase revs. The adjustment you need to make is to the preload spring.
They are very sensitive to the motor being in good tune so do the air cleaner, spark plug etc before trying to get it right. Under voltage can do more damage than over voltage so take your time and get it to a good steady correct voltage with your usual expected load on it. A safety trip out box gives you a way to test voltage with a load on & some protection.
Work safe

Posted on Oct 15, 2009

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Fri st check your tag on the gen set. should read 3600 rpms at 60 hz. set your rpms so you see 120 volt no load. (this should be at your 120 receptacle). your RPM's directly affects your power out put. if your unable to maintain a steady power out put, call or take it to your local service shop to have it check and calibrated.

Posted on Oct 15, 2009


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