[buffettck]

Yeah, you don't "need" to change the jets....
You should get about 85-90% efficiency.
Or another way to look at it......about 7 hours of runtime out of each fill up on eco-mode....instead of 8....give or take.

But like I said....if it was MY generator at that altitude.....

I'd have to have the highest performing, best out-putting lil "racing" Honda generator in town so I'd make up a 61 MJ and get it juuuuuust right. lol

Well, the Honda guy I talked to here in my area at my elevation who works on these for a living said it wouldn't matter as he tried it on his personal 2000i. Remember, there's a thousand foot+ overlap on that graph at the 5000ft transition point. For me at 4700ft, if the stock jet is good to at least 6000ft, it would do no good switching to the 5000ft jet for a mere 300ft difference. Again, I'd rather have it a tad rich than the other way around anyway, if it actually is. :tango_face_smile:

 

[Predator]

Well, the Honda guy I talked to here in my area at my elevation who works on these for a living said it wouldn't matter as he tried it on his personal 2000i. Remember, there's a thousand foot+ overlap on that graph at the 5000ft transition point. For me at 4700ft, if the stock jet is good to at least 6000ft, it would do no good switching to the 5000ft jet for a mere 300ft difference. Again, I'd rather have it a tad rich than the other way around anyway, if it actually is. :tango_face_smile:

Good thinking buffet.
We are in agreement....for you, the stock jet is "good enough" (meaning will work) up to your altitude just fine.

And sure, the stock jet is "good" to 6,000ft. Heck, it will "run" at much higher altitude than that with stock jetting. No argument there.
But, at the end of the day.....you simply can't avoid physics..... after about 3,000ft with stock sea level jetting, it's not "optimal". Honda says about 85% efficient at 5000ft altitude. Would running a 61 or even 62 main jet cause your engine to run lean? With near certainty, I can say not to any degree that should concern you. Honda agrees since they recommend the 62 main jet at your altitude regardless. For all intents and purposes you are at 5000ft.

I'm sure your local guy means well and probably is very experienced, but I do think Honda has more experience with your Honda generator than your "local guy" (or me). Honda has thousands of experienced techs and in house engineers. And Honda says change the jet at 5,000ft. For all intents and purposes you are at 5000ft.

So what's the cost of using the stock jetting at 5000ft? It will burn slightly more fuel (running slightly rich instead of optimally), and your engine will experience slightly faster carbon deposit buildups than an optimally tuned engine, and your oil will dirty slightly faster due to more hydrocarbons in the combustion process.

Would I change the jet if I were YOU? Probably not. You would probably be uncomfortable changing the jet as you are convinced it's somehow dangerous to your generator. Peace of mind is what you'll have leaving it alone.

Is jetting worth it with a Honda EU2000i at 4,700ft? Some would say yes, others no. I would definitely change it. Honda says yes. That said.... your "local guy" says no and it's perfectly fine to be one of those who say "no" :tango_face_smile:

my 2 cents...but then I love talking about engines and tuning

 

[buffettck]

Honda agrees since they recommend the 62 main jet at your altitude regardless. For all intents and purposes you are at 5000ft.

Sorry, but no they don't. 5000ft is 5000ft. Anything less isn't 5000ft which is precisely where the Honda chart "recommends" switching to the 62 jet. I haven't seen an official Honda mention of a 61 jet. Besides, I'll be much more likely to use it at lower elevations than higher elevations, so I'll be sticking with the stock 60 jet.

Is jetting worth it with a Honda EU2000i at 4,700ft? Some would say yes, others no. I would definitely change it. Honda says yes.

Per the chart, no they didn't.

 

[Predator]

Sorry, but no they don't. 5000ft is 5000ft. Anything less isn't 5000ft which is precisely where the Honda chart "recommends" switching to the 62 jet. I haven't seen an official Honda mention of a 61 jet. Besides, I'll be much more likely to use it at lower elevations than higher elevations, so I'll be sticking with the stock 60 jet.
Per the chart, no they didn't.

Seems you are getting defensive over a difference of opinions.
You should stick with whatever you are comfortable with as I said.

Your Honda generator will work fine with the stock jet. I just outlined the realities of physics.
You'll be running at about 85% efficiency per Honda. No biggie. (Do you disagree with that?)
It really is no big deal either way. If you were closer to 10,000ft then it would become significant.

I think 5000ft is a guideline. They don't mean 5000ft to the foot.
I assure you that for all "Intents and Purposes", (in terms of engine performance), that 4700ft is the same as 5000ft.
The change in density altitude over 300ft is negligible in most circumstances.
It would matter if you were flying an IFR precision approach in low visibility weather...but not for engine performance in a generator.

I would definitely rejet my generator at 4,700ft.....but then I'm probably one of those fanatical tuners

You, sir, do not have to......trust me.....I'm not coming there with jets to make you change it lol

Have fun!