Question about Coleman Powermate Premium Plus 6250W Portable Generator

4 Answers

Coleman Powermate 6250 only runs with choke closed/air restricted

New generator, purchased last year, used for the first time this weekend. (Major Ice storm in NH)

It starts and runs with full choke, but dies with choke off. It will run all day with the choke on or the airway other wise constricted.

Checked plugs after 18hrs of operation w/full choke and the spark plug looks clean, dry and grey...

Suspect carb is adjusted too lean, or not jetted correctly for operation in cold temps <25 deg f.

Problem: no apperant fuel mixture adjustment on the carb (subaru/robin Engine).

Any assistance would be greatly apprecated, thanks in advance.

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  • dmsikora Dec 14, 2008

    I bought the same generator at the Salem NH Home Depot in the fall of 2007 and used it for the first time this weekend. Like you, it starts firts pull on full choke, though dies if you take the choke off even slightly. It will run fine, slight sputtering, for hours on choke and will die if you try to take the choke off. I pulled the air cleaner to make sure that the choke was labeled properly and everything looked correct. I pulled the plug and am seeing black soot on the plug as well on the exhaust. Soot is dry not wet. I ran the generator for about 5 hours oever the entire weekend. It sounds like we are having the same problem. My guess is that there is low gas flow into the carburator except when choke is on full, causing excess vacuum into the carb, drawing required gas. I have checked the gas flow from the shutoff at the bottom of the tank, that appears to be working correctly and not restricting gas flow. I would like to get this working clorrectly. I am concerned that leaving it running so rich will burn a valve of cause other issues with the generator.

  • ce_podesta Dec 14, 2008

    Agree that it's too much air to fuel.

    What I did was further restrict the air flow by stuffing a bit of rag into the air intake. Adjust until the gen runs w/the choke open.

    I checked the plugs this afternoon. 40 hrs of run time and the plugs are still clean...

    Still waiting for the power to come back on. 72 hrs and counting....

  • seymournh Dec 15, 2008

    Similar .... but different.

    Generator ran fine for two days (total of about 15-18 hours). It then quit and now will start and run from 30 sec to 2 minutes, then abruptly shut down. Seems like it suddenly runs out of gas. Checked fuel lines, etc. and all good. But - looking into tank there appears to be silver cloth-like 'thing' over the outlet hole - could this be a collapsed in-tank filter? Thanks

  • premeshmahes
    premeshmahes Aug 23, 2012

    I have the same problem. I have a Coleman Powermate Generator 6520 watt 10 hp. I can run it only on Choke, Run then falls directly out. Does anyone have an idea why???? And I also have a problem with my switch. He was quite a while loosely thrown so now I can not remember what kabbel where to go. Please help

  • premeshmahes
    premeshmahes Aug 23, 2012

    I have the same problem. I have a Coleman Powermate Generator 6520 watt 10 hp. I can run it only on Choke Run then falls directly out. Does anyone have an idea why???? And I also have a problem with my switch. He was quite a while loosely thrown so now I can not remember what kabbel where to go. Please help

  • premeshmahes
    premeshmahes Aug 23, 2012



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A call to Elliott Small Engine solved my problem - Oil Guard. I had checked the oil and it was just a little low but seemed well within the normal range. I was told to add more, bringing it just over the Full mark. It seems that the low oil protection system is very sensitive and shuts down the engine even when the oil is withing 1/8" of the mark. I added about 2-3 oz of oil and no more problems

Posted on Dec 16, 2008

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I have the same problem. I have a Coleman Powermate Generator 6250 watt 10 hp. I can run it only on Choke Run then falls directly out. Does anyone have an idea why???? And I also have a problem with my switch. He was quite a while loosely thrown so now I can not remember what kabbel where to go. Please help

Posted on Aug 23, 2012

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Thanks Carl. Briggs & Stratton told me the same thing yesterday. They said that the intake could actually build ice in low temperatures and that it is considered normal to have to run on full choke in such weather. They did not feel this was an issue as long as it was not blowing smoke. B&S was actually quite helpful and got several people involved including an engineer from their generator division.

Posted on Dec 16, 2008

  • ce_podesta Dec 08, 2013

    Issue was a clogged jet. Came from the factory that way.... Opened up the carb and discovered that the jet was 95% clogged with a very hard sudstance. Cleaned it out and it rand fine.


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Hi folks,

You're both right to think that these engines were not intended to work at extreme low temps and that's a factor here.
The dry black soot on the plugs is probably just oil getting into the intake thru the breather, maybe check the air cleaner.
On some of the generators I've worked on there was a small plate in the air cleaner cover that slightly restricted air flow into the carb for low temp operation. Both of you might want to try getting a cardboard box quite a bit larger than the generator, cut a couple of holes in it to let exhaust out, and put it over the generator so that the air going into the intake gets heated a little bit by the engine. You'll want to monitor the generator pretty closely so I wouldn't recommend this overnight. You both should also be extra careful about the right amount of oil in the sump and changing it more often than usual.

My thoughts are with you folks,

Posted on Dec 15, 2008

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