Hey all,Can those who have had experience running Honda EU generators re-jetted at high altitude post your stories? How did they run? Did they run as expected or as what you thought you would get out of them? I'll be camping at almost 10,000 feet in a few months and will re-jet my EU2000i but wanted to ask what other Honda EU generator owners that have re-jetted their generators thought of high altitude experience.Thanks!Rudy

I've never rejetted my EU2000 and run it at 9500Ft with no problems. One would think it would run rich but it doesn't seem to bother it.

I have done all 3 of mine. I don't remember the exact size I went with, but it was a middle of the road one. Most of my use is between 4000-7500, with up to 9500 occasionally.So I picked a size that covered most situations. I know I am still a little rich at 9500.The fuel usage and power output is slightly improved over stock. Not a lot, but it is noticeable. Yes I have done a side by side comparison, before rejetting the last two.The big payoff is likely long term. The spark plug and combustion chamber should be likeing the correct A/F mixture a lot.

Last year I ran mine at 7500 feet and it barely ran just the microwave which takes about 1300 watts. The voltage was low at ~104 volts and the micro was dim. I since bought 2 high altitude jets but haven't had the chance to try them till later this year. I'm guessing it was only putting out 1200-1300 at altitude. Math says I'm losing 360 watts at 7500, then add the overly rich jetting for another 100--150.

I re-jet every time we go up in altitude. Gens run like they should at sea-level. I have the two high altitude jets. 5000-7500, and 7500 to 10,000 I think. Swap takes about ten minutes when you get used to doing it. I put a tag on the handle to remind me what jet I have and to NOT run it a sea-level with high jets. Yamaha does not offer high-altitude jets. I called the Tech # and the guy said it didn't matter, all air is the same! I bought Hondas. Chino

Running Honda EU generators re-jetted at high altitudes.

robert_at_honda
Explorer
Mar 25, 2015
Here's the typical power loss due to elevation, even with jet changes. Chart from American Honda Motor Co., Inc.

- - -
I work for Honda, but the preceding is my opinion alone.
Robert@Honda
srt20
Explorer
Mar 25, 2015
I don't have a horse in this race, I don't own either, but my snowmobile partner has a Yamaha gen 2k or whatever it is. We have used it in January at 10,400 ft in the Snowy Mtns with no issues at all. We use it to power his trailer as a mobile work shop for when we break stuff. His 42k RV furnace also works great at this exact altitude. I forget what brand furnace it is.
SoundGuy
Explorer
Mar 25, 2015
Chinolbz wrote:
Yamaha does not offer high-altitude jets. I called the Tech # and the guy said it didn't matter, all air is the same!

Wow! :S

I bought Hondas.

Smart move! ;)

FWIW here's the info I have for 3 different jet sizes for the Honda EU2000i ...

- Sea Level to 4,500' is a jet size 62(Honda #99101-ZG0-0620)
- 4,500'-7,500' is a jet size 60(Honda# 99101-ZG0-0600)
- 7,500' and up is a jet size 58(Honda #99101-ZG0-0580)

Also FWIW here's a link I came across several years ago to a great resource for Honda EU2000i replacement parts.
Chinolbz
Explorer
Mar 25, 2015
I re-jet every time we go up in altitude. Gens run like they should at sea-level. I have the two high altitude jets. 5000-7500, and 7500 to 10,000 I think. Swap takes about ten minutes when you get used to doing it. I put a tag on the handle to remind me what jet I have and to NOT run it a sea-level with high jets. Yamaha does not offer high-altitude jets. I called the Tech # and the guy said it didn't matter, all air is the same! I bought Hondas. Chino
marcsbigfoot20b
Explorer
Mar 25, 2015
Last year I ran mine at 7500 feet and it barely ran just the microwave which takes about 1300 watts. The voltage was low at ~104 volts and the micro was dim. I since bought 2 high altitude jets but haven't had the chance to try them till later this year.

I'm guessing it was only putting out 1200-1300 at altitude. Math says I'm losing 360 watts at 7500, then add the overly rich jetting for another 100--150.
Huntindog
Explorer
Mar 25, 2015
I have done all 3 of mine. I don't remember the exact size I went with, but it was a middle of the road one. Most of my use is between 4000-7500, with up to 9500 occasionally.
So I picked a size that covered most situations. I know I am still a little rich at 9500.
The fuel usage and power output is slightly improved over stock. Not a lot, but it is noticeable. Yes I have done a side by side comparison, before rejetting the last two.
The big payoff is likely long term. The spark plug and combustion chamber should be likeing the correct A/F mixture a lot.
Ductape
Explorer
Mar 25, 2015
^x2
F350R
Explorer
Mar 25, 2015
I've never rejetted my EU2000 and run it at 9500Ft with no problems. One would think it would run rich but it doesn't seem to bother it.

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Running Honda EU generators re-jetted at high altitudes.

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