Honda 6500is question

That is true. You loose 4% per 1000 feet above sea level just like a furnace or boiler does. Too bad the honda doesn't have a adjustable main jet like the old brigs & station engines. My old coleman I adjust when I go up or down in attitude. Takes 15 seconds. Turn main jet rod in for high atitude and out for low and the engine will smooth right out. If I get the tri fuel honda you can adjust the pressure regulator with a screw driver to get it to run smoothe at any altitude so I probably would leave the low altitude jets in when I go to a low altitude lake and run on gasoline then propane when I'm up high so I don't have to keep removing the carbarator and replacing the jets. That would be a whole lot easier to adjust the pressure regulator plus the propane is cheaper in my area then gasoline and runs cleaner. The oil stays clean also so its a win-win. You know for the money that the honda costs you would think it would be fuel injected like a harley is. It would adjust itself for differences in altitude. Thanks Dan