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Honda EU20i Eco Mode issue.


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  #1  
Old 10-07-2017, 10:38:50 PM
Asia-Off-Grid Asia-Off-Grid is offline
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Question Honda EU20i Eco Mode issue.

robertathonda may have experience with this? Or, possibly some of you other folks who run Honda Inverter generators, may have encountered this issue?

For a little while now, I have noticed the odd skip in running while in eco mode, regardless as to whether it was under a load, or not.

Today, while powering the apartment during a power cut, the generator actually stalled - cutting off completely. I went to inspect. Gasoline was good. Everything seemed in order, so I started it up. I switched eco mode off and it ran fine. I let it run that way for about 15 minutes, to see if maybe it needed to just clean itself out somewhere. I figured that, maybe, running it on eco mode every time I needed it, may have caused something to build up a bit in the carburetor, or elsewhere. I switched it back to eco mode, but no joy. It started as though it were skipping again.

I don't believe it is a fuel issue. The engine doesn't have that many hours on it, either. Less than 20 hours, tops. So, what could it be, anyone? I have no idea.
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Old 10-08-2017, 07:49:18 AM
Russell Walker Russell Walker is offline
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Default Re: Honda EU20i Eco Mode issue.

Sounds like old gas clogging idle jet in carb.
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  #3  
Old 10-08-2017, 07:54:49 AM
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Default Re: Honda EU20i Eco Mode issue.

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Originally Posted by Russell Walker View Post
Sounds like old gas clogging idle jet in carb.
Is there a schematic, or other information available to help me sort this myself?

Maybe I should consider converting to LPG?
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Old 10-08-2017, 09:23:31 AM
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Default Re: Honda EU20i Eco Mode issue.

Here is a video I took today, after I went outside to see what was going on with the generator: Click here to view video.
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Last edited by Asia-Off-Grid; 10-09-2017 at 12:49:59 AM. Reason: Changed embedded video, to a link.
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Old 10-08-2017, 09:31:56 PM
richard.bessey richard.bessey is offline
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Default Re: Honda EU20i Eco Mode issue.

For some reason I cannot get your video to play.
Rebuilding the carb isn't too terribly difficult. You will need a basic metric socket set, couple screw drivers, and carb cleaner. An air compressor would also be helpful.
How does it start? Mine was getting harder and harder to start and then wouldn't start anymore. Turned out to be old gas. The orifices inside these little carburetors are so small that they are easy to plug up. In my case, it didn't look dirty at all. After cleaning the carb it felt like there was a very light oil inside the carb, thats all it took to clogg it up.
Look on youtube for some great how to videos, if memory serves me right pull the side engine case, a couple screws on the carb and air filter, remove the servo/electrical connector and fuel line, and I think it comes out.
Fairly common on these little gennies.
Also, have you checked your spark plug? if so, what does it look like? Black (carboned up?)
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Old 10-08-2017, 11:48:49 PM
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Default Re: Honda EU20i Eco Mode issue.

Quote:
Originally Posted by richard.bessey View Post
For some reason I cannot get your video to play.
Rebuilding the carb isn't too terribly difficult. You will need a basic metric socket set, couple screw drivers, and carb cleaner. An air compressor would also be helpful.
Good to know. Thank you. I've been looking and was able to download two manuals. Mine is actually an EU20i, purchased here in Cambodia. But, I am pretty sure it is similar to the EU2000i, common in North America, aside from its voltage output of 220vac.

The service manual would not attach. I guess it is too large. Here is a link to both the service and owner's manuals, that should also apply to my generator: https://1drv.ms/f/s!As8hSuMJ-CwpqlEtF-zdlG4ej4v9

I have an air compressor. I will need an blow gun attachment, though. That, I don't have yet. Not sure if I can find carburetor cleaner here. Third World countries aren't known for their conveniences, in any manner. Perhaps some diesel fuel, or mineral spirits would work well enough?

Quote:
Originally Posted by richard.bessey View Post
How does it start? Mine was getting harder and harder to start and then wouldn't start anymore. Turned out to be old gas. The orifices inside these little carburetors are so small that they are easy to plug up. In my case, it didn't look dirty at all. After cleaning the carb it felt like there was a very light oil inside the carb, thats all it took to clogg it up.
It starts fine. Runs great, as long as eco-mode is off. Full throttle is no problem at all. Eco-mode is slowly getting worse. I imagine what Russell said, above, is probably an accurate assessment. That is, the idle jet is clogged. I hope that is the case, anyway.

Quote:
Originally Posted by richard.bessey View Post
Look on youtube for some great how to videos, if memory serves me right pull the side engine case, a couple screws on the carb and air filter, remove the servo/electrical connector and fuel line, and I think it comes out.
Fairly common on these little gennies.
I found one early this morning (GMT+7 time zone) that seems to be pretty informational: https://www.youtube.com/watch?v=njNMxlNseRg

Quote:
Originally Posted by richard.bessey View Post
Also, have you checked your spark plug? if so, what does it look like? Black (carboned up?)
I haven't. I will make it a point to do so, though. However, the generator was purchased new in March. Its first use was just after then. I imagine it isn't the best quality gasoline, used in it, that is available here. Not sure if it has Ethanol in it, or not, either.
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Last edited by Asia-Off-Grid; 10-09-2017 at 01:15:04 AM.
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Old 10-09-2017, 12:22:11 AM
richard.bessey richard.bessey is offline
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Default Re: Honda EU20i Eco Mode issue.

Yes, the video is a great guide, its the same one I used.
I would imagine your genset is the same as the EU2000i except the electric side. So same carb, engine, controls, etc... Just differn't inverter to get the differn't voltage.
Carb cleaner would be best, but any light solvent should work.

And yes, an air compressor with a blow nozzle would be great. Not required but is help full.
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Old 10-09-2017, 12:43:20 AM
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Default Re: Honda EU20i Eco Mode issue.

Quote:
Originally Posted by richard.bessey View Post
Yes, the video is a great guide, its the same one I used.
I would imagine your genset is the same as the EU2000i except the electric side. So same carb, engine, controls, etc... Just differn't inverter to get the differn't voltage.
Carb cleaner would be best, but any light solvent should work.

And yes, an air compressor with a blow nozzle would be great. Not required but is help full.
Thanks a million, Richard, for your assistance. I won't get to work on it until I return from a trip we are going on in the morning. But, as soon as I return, I will jump on this to get it sorted ASAP.
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Old 10-09-2017, 04:49:34 AM
Thaumaturge Thaumaturge is offline
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Default Re: Honda EU20i Eco Mode issue.

From what I've seen, virtually ALL the inverter gens work the same way. The main inverter is driven off like a twelve (or more) coil stator. This is rectified to a high DC voltage, which the inverter turns to AC. In economy mode, the carburetor has a stepper motor on the throttle positioner. Signals from the main inverter "brain" (really just a voltage comparator and a stepper motor driver) tell the carb stepper to throttle down until the voltage feeding the main inverter begins to drop below a set voltage. Brain will then tell carb stepper to throttle up again.

I notice in your video you are running NO LOAD AT ALL. Something I discovered on a cheapo inverter gen was that it would surge and dip unexpecedly if I was running a very small load. Try adding just a 60W light bulb load. I actually got better fuel economy running a slightly higher load.

I would speculate that the reason for this is lack of filtering capacitance between stator winding and main inverter. But that's just my opinion as an electronics engineer, not a generator specialist. I just know what my own experience with cheapo inverter gens has taught me. Try adding a bit more load.
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Old 10-09-2017, 02:02:00 PM
Joe Romas Joe Romas is offline
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Default Re: Honda EU20i Eco Mode issue.

AOG.

My experience with surging is the black plastic pilot tube is your problem.
There's a very small jet at the bottom.
Most times that's all that's needed for surging.

Joe
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  #11  
Old 10-09-2017, 02:20:45 PM
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Default Re: Honda EU20i Eco Mode issue.

Quote:
Originally Posted by Thaumaturge View Post
I notice in your video you are running NO LOAD AT ALL. Something I discovered on a cheapo inverter gen was that it would surge and dip unexpecedly if I was running a very small load. Try adding just a 60W light bulb load. I actually got better fuel economy running a slightly higher load.
Actually, I had just unplugged the generator from the house, when I shot that video. It was running rough, to the point of actually cutting off, just prior to the video being made. I disconnected it to make sure I would not cause any damage to appliances in the house.

Typically, it has about a 400 to 500 watts load, while running. My refrigerator is an inverter. That, along with my computer (~ 150 watts), and two fans and lights, is all we require during power cuts.

---------- Post added at 01:20:45 AM ---------- Previous post was at 01:19:29 AM ----------

Quote:
Originally Posted by Joe Romas View Post
My experience with surging is the black plastic pilot tube is your problem.
There's a very small jet at the bottom.
Most times that's all that's needed for surging.
I hope that is all it is. I will work on it as soon as I return from a trip out of town. I will report back as soon as I can return and work on it.
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Old 10-10-2017, 03:27:28 PM
robertathonda robertathonda is offline
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Default Re: Honda EU20i Eco Mode issue.

Can't say this applies to EU20i models, but it might:





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Caveat: I work for Honda, but the preceding is my opinion alone.
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Old 10-10-2017, 06:23:19 PM
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Default Re: Honda EU20i Eco Mode issue.

Thanks, Robert. I had forgotten that you had posted this before. I will certainly let you know, when I return home from my trip.
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