I have a Karcher 3000 psi pressure washer with a Honda engine. When I start to pressure wash, the engine rpm goes up and down, and the output water pressure goes up and down at the same time.
Almost certainly, your problem is being caused by the engine governor being set wrong. The governor is responsible for adjusting the engine as it comes under a load. With the breather off the carb, watch for the linkage that moves all by itself when you pull the trigger. It will have a spring as part of it, and an "arm" that is part of the linkage. This arm has 4-7 holes in it. Moving the spring to a different hole may fix the problem. There is also usually an adjustment screw that you can toy with and see if that tweaks it. But I'd definitely try moving the spring -- 1 position at a time -- and see if it a). helps or b). hinders......... Depending on the answer, you get a clue as to which direction to go with your next adjustment attempt. One of two directions will put the correct tension of the spring/arm and cause the governor to govern correctly.
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