Troy Bilt power washer runs lean

I have a newer Troy Bilt pressure washer - model# 020344. It has the Honda engine.





I have a problem with it running lean and don't know what else to try. I know its lean because it only runs smooth when I choke it about 80%. With the choke open (more air) it "pulses" (idle up, idle down, idle up, idle down, idle up, etc). Raaauuurrraaaauuuurrrraauuu. Not sure how else to describe that

Here is what I have tried thus far:
drained the float
new gas
sprayed carb cleaner into intake
changed spark plug (it looked lean)

I don't see a fuel screw or air screw. Any other suggestions? I will take pictures if you have questions.

Thanks.