r7000
Well-Known OPE Member
I have the Harbor Freight Predator 420cc pressure washer (4400psi, 4.2gpm). The carburetor on it is HUAYI. I bought this unit in summer of 2022.
I believe the black plastic jet (pilot?) is a #43, stamped on it from what I can see.
The main jet looks to be an 86,.
Internetting I see a #104 and #107 jet kit on amazon/ebay that is touted for this 320/390/420 size honda engines and clones and similar as being good.
Are there jet kits available for this carb? How about an adjustable main jet? Is there a way to enlarge the pilot low speed orifice (that seems really tiny, anyone know that diameter?) ?
Running machine in 50°F weather I need 1/4 choke for engine to run without surging at high speed. Low speed the engine will stall if you trigger the wand- either engaging the pump or when the pump disengages. I can never start the engine, even hot in 80°F, without using full choke.
What about micro drill bits and enlarging the main jet myself? Any possibility of doing this on the pilot jet?
I believe the black plastic jet (pilot?) is a #43, stamped on it from what I can see.
The main jet looks to be an 86,.
Internetting I see a #104 and #107 jet kit on amazon/ebay that is touted for this 320/390/420 size honda engines and clones and similar as being good.
Are there jet kits available for this carb? How about an adjustable main jet? Is there a way to enlarge the pilot low speed orifice (that seems really tiny, anyone know that diameter?) ?
Running machine in 50°F weather I need 1/4 choke for engine to run without surging at high speed. Low speed the engine will stall if you trigger the wand- either engaging the pump or when the pump disengages. I can never start the engine, even hot in 80°F, without using full choke.
What about micro drill bits and enlarging the main jet myself? Any possibility of doing this on the pilot jet?
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