Question about Coleman Powermate Powermate 5000W Generator

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Won't start has not been started in five years, has new gas,new oil and new spark plug

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Assuming the engine spins...

1) The carb could have had fuel still in it when it was put into storage. The fuel evaporated out, leaving behind residue that has likely plugged up the passages / jets. Pull the carb, disassemble (get the service manual from powermate.com), clean everything you can (this is likely an EPA carb, some areas sealed), then reassemble with new gaskets, orings, float seat, etc.

2) Rings / valve may be sticking or not making good enough of a seal for proper compression. To check this, remove the plug, screw in a compression guage, spin engine a few times. Note the reading on the compression guage. If it is less than specified in manual, then start looking at rings and valves. If compression meets specs, goto #3.

3) While you have the plug out of the engine, hold the threads to the head. Spin engine. You should see a healthy blue spark. If not, then start troubleshooting the magneto / ignition module.

Posted on Jun 11, 2010

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The carburator may be empty. Open it and fill it with fuel before starting.
Other way is to get a starter spray, open the input collector or where it is possible and spray while starting.

Posted on Jun 04, 2010

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Posted on Jan 02, 2017

SOURCE: Powermate 4000 with Briggs &

Next step is to check that the magnet attached to the fly wheel is working properly. When you crank the generator over, put a multimeter on the leads to the magnet and look for a spike in the voltage. Be sure to get the polarity correct or you will damage your multimeter. If there isn't a spike in the voltage, then either the magnet is bad or the fly wheel is damaged. In either case parts will have to be ordered and replaced. If there is a spike in voltage, then it is time to check the fuel intake. Open up and take out the air filter. Inspect the air filter to make sure it is clean and doesn't have fuel or oil in it. If the air filter is we with either things, then this will prevent air from reaching the engine. This alone will cause it not to start. If the filter is clean, then leave it off and open up the throttle. This will give you direct access to the engine through the fuel intake. Put some fuel into a spray bottle, and when you crank over the engine spray some fuel into the hole where the air filter was. If the engine starts/sputters then you have a problem with your carburetor. If the engine doesn't start then you have a deeper issue that may require a trained mechanic to fix. Lets say that if the engine does start/sputter, then we need to take the carburetor off. Our goal is to clean the carburetor of any build-up and/or corrosion that has settled in the carburetor bowl. The carburetor is between the air filter assembly and the main engine block. When in doubt, trace the fuel line from the gas tank, and it will lead you to the carburetor. Next, grab the necessary tools and start by turning off the fuel and draining the carburetor. The fuel valve is typically inline with the fuel line. To drain the carburetor bowl loosen the screw on the bottom of the carburetor bowl. Once the last drop is out, then unbolt the carburetor from the engine block. With the carburetor off and parts labeled for easy re-assembly, you then have to remove the fuel bowl. This will either unscrew as a whole from the carburetor body, or have a central bolt that has to be removed. When removing the bowl, PLEASE be very careful and mindful of the fuel float and the filling pin. With the bowl safely off, inspect it for fuel build-up and rust/corrosion. If there is either in the bowl then this means you need to grab a fuel safe cup and an old toothbrush and carefully start cleaning the bowl and the surrounding parts. If you are comfortable with small parts at this point, then carefully remove the fuel float and the the filler pin underneath it. Please take note on how this dis-assembles to ease re-assembly. Clean these parts as well with the clean fuel and toothbrush. Assemble the parts back together once you are sure everything is clean and put the carburetor assembly back onto the engine block. Once everything is tightened down, it is time to turn the fuel back on at the valve on the fuel line. With the fuel back on, hit the prime button 3-5 times and crank the engine over. If the engine doesn't turn over at this point, then there is a much deeper mechanical issue that requires a trained mechanic to fix. Most mechanical fixes at this point are not worth your while and you may save money by purchasing a new engine/generator. Please let me know what you find during diagnosis, and I can provide more help.

Posted on Aug 27, 2011

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