Working pressure low, idle pressure very high

More pressure. I bucket tested it and got about 3.8 gpm. no nozzle
That reach was with a pink 2nd story tip.

That’s about right. I’m assuming you have a gx390. That’s just about 11.7 horsepower. You can’t get 4gpm and 3500 from your machine so settle on one or the other. I’d stick with gpm.

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