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Old 06-19-2009, 10:17 AM   #1
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Honda EU2000 rejet of the carburetor

Hi Everyone: Not sure what to do here. I just bought a Honda EU2000 generator, which will not start at my house since I live at 8500 feet. The dealer informed me that I need to have the carburetor rejetted for use above 5000' feet. About 75% of my camping will be above 5000 feet, however, I was informed that if the generator needs to be used below 5000 feet that it has to be modified again, else I can ruin it. It makes no sense for me to have to modifiy my generator back and forth. Anyone know of any quick fixes/mods that can help with this?

Thanks!
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Old 06-19-2009, 11:01 AM   #2
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No, but here's the rejet procedure. It's not too bad:

"Replacing Carburetor Jet for High Altitude Operation
Honda EU2000I

Tools Needed: Flat blade screwdriver, 8mm socket, and 10mm socket.

1. Turn ENGINE SWITCH to OFF.
2. Turn FUEL TANK CAP VENT LEVER to OFF.
3. Remove the MAINTENANCE COVER.
4. Remove the AIR CLEANER COVER and MAIN and OUTER FILTERS.
5. Drain GAS from the carburetor by loosening the SCREW on bottom of carburetor bowl. Close DRAIN SCREW when finished.
6. Remove HEX BOLT holding the black air box on. (8mm)
7. Remove TWO NUTS holding the air box and carburetor. (8mm)
8. Slide AIR BOX off carburetor studs and fold down out of the way.
9. Slide CARBURETOR out being careful with GASKETS (two, front and back).
You may have to remove one or two hoses from their brackets in order to slide off of studs.
10. Remove HEX BOLT holding carburetor bowl. (10mm)
11. Remove CARBURETOR JET by unscrewing with flat blade screwdriver and replace with NEW JET. Do not overtighten.
12. Reverse procedure for reassembly.

Elevation Honda Part No.
0 – 4000 ft, 62
4000 – 7000 ft. 60
6000 – 10000 ft. 58
Carburetor: KEI HIN

Note: Engine horsepower decreases about 3.5% for each 1,000-foot increase in altitude. The effect on horsepower will be greater if no carburetor modification is made."
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Old 06-19-2009, 11:07 AM   #3
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I have an EU1000i which is used to charge the battery on longer weekends. If you are going to run at high altitudes, re jetting is a good solution. I have run my unit with the standard jetting at many locations and altitudes with no issues. Starting and running at over 9,000 feet has never been a problem for me.
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Old 06-19-2009, 12:09 PM   #4
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Quote:
Originally Posted by azflycaster View Post
I have an EU1000i which is used to charge the battery on longer weekends. If you are going to run at high altitudes, re jetting is a good solution. I have run my unit with the standard jetting at many locations and altitudes with no issues. Starting and running at over 9,000 feet has never been a problem for me.
Same here.
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Old 06-19-2009, 12:30 PM   #5
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You trying fresh gas? A lot of gas is formulated for commutor drivers, they expect it to be renewed every two weeks.

Running at altitude with stock jet is allowing too much fuel in so it will be acting like it is on 'full choke' setting at altitude which can foul plugs and dilute the oil lubrication, which is bad on piston/cylinder with heat friction and lowered cooling with thin air at altitude. But running leaner jetting with thick air makes it run HOT. Better to know you need to change oil more often than fry the piston crown, etc.

This web site shows a different option than the 5,000 foot your dealer speaks of, sure its only 1,000 foot difference but might make a happier compromise?

High Altitude Main Jet (4000-7000 feet)

High Altitude Main Jet (6000-10000 feet)
Plano Power Equipment Online Store - Honda EU2000i Generator Common Parts
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Old 06-19-2009, 03:48 PM   #6
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Absolutely KEEP YOUR FUEL FRESH, anything over 30days old is junk.Its made that way to evaporate fast and burn clean. But when todays DESIGNER FUEL evaporates while setting it leaves behind all the additives that make it a clean burn and they GUNK up the carb. Absolutely do not Use E 85. I would think the easiest and fastest way is to run 2 carbs. They are not hard to change. One jetted regular which you have and One jetted for altitude.I'm not sure why you are having starting problems. It should start regardless. It just will not have any power at high elevations.The air is thinner and the jets allow to much fuel for the available air.
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Old 06-19-2009, 04:15 PM   #7
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Or consider running on propane ... my Yamaha 2400 does both gasoline and propane (US Carburetion mfr'd) and on propane it has a separate mixture control that you manually set to a slightly lean-of-peak-rpm setting ... this takes about ten seconds - so whatever altitude, you're at least running a nearly perfect stoichiometric mix. Easeir than re-jetting wherever you go.
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Old 06-19-2009, 06:09 PM   #8
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You should be able to run at altitude using stock jet. However, you will lose performance and the system will run on a rich mixture. This will foul your spark plug over time so you will need to periodically clean the plug from carbon build up. If you rejet for high altitude, DO NOT run the unit at lower altitude without rejetting as in this case, the unit will run lean causing an overheating condition leading to permanent damage.
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Old 06-19-2009, 06:15 PM   #9
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Mico75,

Make sure you check your oil level. I don't know about the ES2000 but the ES3000 is normally delivered with very little oil and will not start unless it has the right amount of oil. Ask me how I know
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Old 06-19-2009, 07:11 PM   #10
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A little carb cleaner will help start the generator. Not only will it remove gunk it is highly flammable. Take the air filter off first. get it running and then put the air filter back on.
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Old 06-20-2009, 12:51 AM   #11
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Hi, as mentioned, your carburetor will be richer at high altitudes; I have found that on some engines a few things will make it work. First try to start the generator without using the choke, it won't need it and using the choke will flood the engine and fowl the spark plug. [wet] Next, just lean out the idle mixture; This will get it started and running and won't cause a lean condition under load. [sort of like altitude compensation] And of course, a clean air filter is a must in preventing a constantly rich or choked situation.
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Old 06-20-2009, 05:17 AM   #12
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One handy tip you may find useful would be to run your tanks dry after use especially prior to putting the generators away for storage for any fairly long length of time. This will get the old fuel out of the carb and prevent fouling. It certainly will prevent having to replace or clean up the carbs.
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Old 06-20-2009, 09:19 AM   #13
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The dealer should have replaced the jet for you at N/C and given you the standard jet. The jets on smaller generators need to be changed for higher altitudes (5000'+). On the larger generators like the 3000 and larger, they should run fine. I have a Honda 5000EMS and the standard carb jets run fine. I had my 2000EU jet changed since most of my use is here in the mountains where hook-ups are not that common. If heading to the flatlands, I will have the dealer convert back or just plan to use hook-up sights since it would most likely be warm and would need the AC.
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Old 06-21-2009, 03:08 PM   #14
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Hi Everyone:
Thanks for all the useful information. The dealer has taken the generator back to rejet for no charge. If I need to switch back I will take care of it myself.
Thanks again...
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