Question about Coleman Powermate Powermate 5000W Generator

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Surging 5000w Coleman Generator

It does fine when you first crank it. Once it warms up it surges back and fourth. I took the carb apart and it looked ok. Put it back together same problem. The only time it does not surge is when it has a full load on it. Any help would be appreciated thanks.

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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,.

Posted on May 08, 2009

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Re. Coleman Powermate 5000 Watt Generator (surging)
Apparently, no one has a solution for this. I have been fighting this "piece" of equipment since the day I bought it. At first I had to spray gas into it to even get it started. After a new carburator, valve job, spark plug, new head head gasket, and new governor spring, it now starts after a couple pulls but still surges terribley. I am at my witts end and refuse to put more money into it. It's only good enough to run a couple of lights, just can't trust it to run and or ruin a refridgerator. Sadly disappointed in this so called generator.
DT, South Dakota

Posted on Jun 24, 2013

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Posted on Jan 02, 2017

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hi,

sound through experience you have a air leak possible from a gasket or oring if so equipped. take some wd 40 and spray around the carb gaskets and seams. if this stabalises the surging or smooths it out it is definatley seeping air around it. in any case you will most likely need to take the carb back apart and repair or replace the gasket. hopes this helped. happy mowing!

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