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Posted on Sep 08, 2011
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Have a Honda EU6500is generator with 410 hours. I live off grid and run the gen 2-3 hours daily. The generator rpm surges under load on eco throttle and surges under load AND without load when the eco is off. Have had it to the Honda dealership twice. The Tech says he can not get it to surge when hooked to his load center. Yesterday he took the carb apart and says he could not find anything wrong. He sent me home with a tank of premium. Once I had the gen back in it's shed, I decided not to plug in the house cord (to make sure nothing in my house system was causing the problem), instead I plugged a clothes iron and toaster directly into the gen receptacles. Once again the gen surged ... with both eco on and eco off. With echo on, the surge is 3-400 rpm. Can you help me help the tech figure out what is wrong?

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Anonymous

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  • Posted on Sep 26, 2012
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I have the same problem with a new one ,take a peace of paper and cover the battery cover air inlet when it's running ,if your problem stops-it's the seal around the cover,a honda rep let the cat out of the bag,---jk

  • 4 more comments 
  • Anonymous Nov 28, 2012

    JK - What did you need a new seal

  • Anonymous Dec 08, 2012

    JHK - What seal was it - Front Cover or Battery Seal ????

  • Anonymous Jan 11, 2013

    I have the same issue. A new EU6500is, that surges when over 50% load. The piece of paper works. I don't see any seal around the battery cover. Should there be one?

  • Anonymous Jul 27, 2013

    I just toke delivery of a new EU6500is. It's starts to surge as you discribed after it warms up (5 min.). While cold, it the barrery cover off it surges also. When it would start to warm up and show signs of surging, covering the vents in the battery cover would smooth the motor untill it was warm. What did you end up doing to fix the problem?

  • Paul Hodara Feb 15, 2015

    Amazing worked for me, new generator only 11 hours on it, have already had a lot of problems with this like the battery not holding a charge, the surging I had it in for service three times and have only used it once for a 4 hour power failure.

  • dtmaia
    dtmaia Oct 19, 2015

    Same problem. I covered the whole vent system to the height of the battery cover and the surging stopped. Does this hurt the engine? What is the permanent fix?

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TEtim

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  • Posted on Dec 04, 2014
TEtim
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The battery cover trick worked for me. The cover has to be on to prevent the surging with or without the eco throttle being on. Thanks!

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Troy Leffler

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  • Posted on May 08, 2009

SOURCE: Surging 5000w Coleman Generator

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,.

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Anonymous

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  • Posted on Oct 09, 2009

SOURCE: Honda EU3000is Generator is running poorly.

Can anyone help me with the eco-trottle switch when I switch it on it seems to run the same idle whether I have it off or on, what could be causing it not to work, is it a bad switch or I am running 89 octane could that be the problem.

Thanks
Alex

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Honda EM5000SX generator - will not idle up when a load is placed on. Will produce power but will not idle up.
from your description and what you do , the problem is in the auto control unit
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by turning the auto operation off you are committing the gen set to full rpms regardless of the power requirement
you have the option of having it fixed at an gen set repair shop or leaving it off and starting the genset only when you have a mains power outage
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What connector is needed for a remote start?
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Service manual required
I can't find a free download on the internet, most are Owner's manuals or are not for the exact model you want - I don't know how similar similar models are. You might try the following:

http://cdn.powerequipment.honda.com/pe/pdf/manuals/00X31Z376011.pdf (from Honda, EU7000is owner's)
Honda EU7000i Model Info Super Quiet 7000 Watt Inverter Generator Honda...

This is the shop manual for the EU6500is model ($44)
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owner's for the EU6500is
http://www.freeproductmanual.com/honda-eu6500is-manual

Finally a link to the search results most of the were taken from
https://uk.search.yahoo.com/search;_ylt=A9mSs2tVBShVngQA_xZLBQx.;_ylc=X1MDMjExNDcxNzAwMwRfcgMyBGZyA2FsdGF2aXN0YQRncHJpZANyOTBfV1hQeVNvT0twcW5oS3NxWlFBBG5fcnNsdAMwBG5fc3VnZwM0BG9yaWdpbgN1ay5zZWFyY2gueWFob28uY29tBHBvcwMwBHBxc3RyAwRwcXN0cmwDBHFzdHJsAzMwBHF1ZXJ5A0hvbmRhIEVVNjUwMGlzQSBzZXJ2aWNlIG1hbnVhbAR0X3N0bXADMTQyODY4NjQ3NQ--?p=Honda+EU6500isA+service+manual&fr2=sb-top-uk.search&fr=altavista

You could try contacting Honda (relevant division) also; if they will provide the manual you want, it might be free

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Honda 3000is runs great on eco but hesitates and either stops the load source or stops running itself when under load.
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Funny thing, I have one on my workbench that is doing pretty much the same thing. Runs on eco, revs up with eco off with no load, coughs, sputters and dies with a load in either mode. I will update with what I find when I figure it out in the next week or so. Have a new carb on order.

I swapped the carb and it made no difference. Still backfiring (rather dramatically) and won't stay running. I see on some other posts that Valve lash will cause this. It makes total sense as the exhaust valve gap actually tightens as the engine wears which would keep the exhaust valve slightly open when it ain't supposed to be allowing raw fuel to enter the muffler.
With this one I can believe it as it has a ton of hours on it and I know they have never been adjusted.
I will try to get a chance to do it over the weekend and update this post when I do.
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Tune up Honda can some one pick up at home and take to shop the bring back ?
Most common problem with under underutilised genset is stale fuel. At best drain all the fuel and refill at worst the fuel system will need flushing.

Kevin H
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Aug 21, 2014 • Honda EU6500iS Inverter Generator
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Honda EU3000is Generator is running poorly.
Can anyone help me with the eco-trottle switch when I switch it on it seems to run the same idle whether I have it off or on, what could be causing it not to work, is it a bad switch or I am running 89 octane could that be the problem.

Thanks
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