Honda EU2000i at high altitude

We just did 8 days boondocking out side Bryce, around 7500 ft. Ran the EU2000 every day, no problems at all.

agesilaus wrote:
We just did 8 days boondocking out side Bryce, around 7500 ft. Ran the EU2000 every day, no problems at all.

With "standard" carburetor jet ???

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I think I may have posted this in another thread, or at least I thought about it. I live at 5500 feet, and have camped at over 7000 feet and I run the stock jets. The only issue you may have is reduced output do to reduced engine power, but if all you are doing is charging your batteries, don't even worry about it.

I did it at a peak over 7000 feet on a couple ham radio Field Day weekends, and the Honda ran all weekend with no issues what so ever. It still does, but I may have changed the spark plug since then, it was a few years ago.

Those were a couple fun weekends. The land dropped off all around me, I had a 20 meter dipole up about 35 feet and pretty much worked anyone I wanted on 20 with 100 watts. Last year by a lake I almost couldn't buy a contact.

With only four hours a day of running your generator to recharge your batteries, the Honda should handle this work fine at 7000 feet. No other option I guess.

Having serviced everything from Honda 600s to Wisconsin V4 37.5 horsepower prime movers at altitudes to 11,200 ft. (Saddlebag Lake) my opinion about the necessity of reducing jet orifices is not glowing.

I had difficulty in discerning any difference in power. No reduction in exhaust smoke. But I did re-set to reduce oil contamination and improve spark plug life.
Using a "scale" of total improvements with prime movers with adjustable initial timing, the aggregate total of timing and jets was estimated to be 97% timing and 3% re-jetting. On a high altitude only service pickup I fitted 12.5 to 1 compression pistons and that modification amounted to at best only a modest increase in power. By far turbocharging with a waste gate or supercharging made significant power gains.
As a side note I successfully was able to use regular gasoline in the service truck.
I wish you the best of luck

I lived in Colorado at 8200' for 30 years and used a pair of Honda generators for various uses since for more than 15 years. Since you are only going to charge a 12v battery at 7000', don't worry about it. When you get to around 10,000' and above, even a pair of them in parallel they will get "breathless" trying to run the A/C, a toaster oven, TV, lights, etc. Like I said not to worry about changing jets.

I have a pair of Yamaha's, and have three friends with the Honda's. I don't think any of us have changed jets. All have been run about 10,000' for charging purposes and microwave as well.

I wouldn't worry about it. If you are concerned, bring extra spark plugs.

Well........thank all of you for the comments. Looks apparent the verdict is that the stock jet will work for me at 7000 ft. By the way, I have purchased the 5-7K ft jet for the Honda and I will have that with me just in case, but I really did not want to have to get into the carb, and then have to re-do the job when I got back home. I will also carry a couple of extra plugs just in case.

The Honda techs I spoke with said that all newer small engines really run lean these days thanks to current EPA manufacturing standards. They said this may be one reason why the stock jets work OK at higher altitudes.

dieseltruckdriver wrote:


I did it at a peak over 7000 feet on a couple ham radio Field Day weekends, and the Honda ran all weekend with no issues what so ever. It still does, but I may have changed the spark plug since then, it was a few years ago.

Those were a couple fun weekends. The land dropped off all around me, I had a 20 meter dipole up about 35 feet and pretty much worked anyone I wanted on 20 with 100 watts. Last year by a lake I almost couldn't buy a contact.

Your message reminded me of how much fun I used to have working ARRL Field Day. 40M CW was my favorite. We had a great local club and always had good turnout. I live at close to sea level so never had the privilege to have a 7000 ft tower at my disposal. 73