Question about Karcher 2500 PSI Pressure Washer

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Honda motor only runs with choke fully on.

Has fresh gas,flow to carb,muffler clean,and blew air through what looks like the main jet in carb, all clear

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  • harpan65 May 03, 2010

    My honda motors other jet does not have a slot in it so you can remove it,also the bottom float bowl screw does not have any holes on it.The float and everything checked out fine.Got to run without choke,but when you run it for awhile under load (using washer) it will stall out after about 1 min of constant use. Pump? Had to take this exact power washer back while under warranty,because it would not kick into high pressure and replace it with a new washer. Any suggestions?

  • harpan65 May 04, 2010

    Lubed up the pump and the washer worked fine.Think I need to pay more attention to pump when I winterize it next year. Thanks for all your suggestions.


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Lets back up and regroup on the carb cleaning.

Before you start.... if you have a digital camera take "close up" PICTURES of the linkages and springs attaching to the carb. If this is your first time you will be so glad you did. You can always delete them later if you don't need them. :)

Here is what you need to do:

1. Fuel selector off
2. Remove float bowl mounting screws and nut
3. Remove the BRASS Jet / Orifice in the very bottom of the venturi tube inside the pickup tube. (Flat blade screwdriver) Hold the Orifice up to the light. You should see a pinhole. If it is not clear clean the orifice but do not force anything through the hole.
4. Underneath the Orifice there is yet another BRASS tube that you need to remove. (Flat blade screwdriver) Make sure all of the holes in the tube are clear. The tube will be over 2 inches long. Clean it and reinstall it.
5. Reinstall the Orifice.
6. Using a catch fuel container turn on the fuel selector. Fuel should flow at a good rate. GENTLY lift the float assy level and make sure fuel flow shuts off. When you drop the float again fuel should flow.
If you do not have fuel flow at this point the needle and seat will need to be inspected. Fuel selector OFF.
(The following procedure is to be done only if there is no fuel flow with fuel selector on.)
a. Remove the silver float pivot pin retaining screw
b. Drop the Float down (The needle will come off with the float. NOTE the position)
c. Inspect the tapered rubber of the needle If should be pointed. If it is not pointed then the rubber tip is stuck inside the seat.
d. Clean the seat hole ONLY if obstructed. (Easily damaged)
e. FUEL Selector on then off fuel should rapidly flow through the needle seat.
f. Renistall Float and needle making sure to get the pivot / hinge pin installed correctly and reinstall the silver retaining screw.
g. Fuel selector ON. Raise and lower float checking for free movement with fuel flow when lowered and stopped when the float is raised level.

NOTE if fuel does NOT stop when float is level you will need to bend the float tab (tab up if level is too high or tab down if level is too low) where the needle attaches to the float assy until it does.

7. If there still is no fuel flow at this point remove the fuel hose from the carb and check fuel flow. If no flow check that gas tank exit hole, fuel filter (if installed) and the selector valve assy for obstructions.

Reassemble connections.


Step 8 is VERY important"

8. BEFORE you install the float bowl inspect the bowl nut. There are 2 holes in the side of the nut where it screws in to the bottom of the carb that must be clear.

9. Install Float bowl mounting screws and nut. Check for leaks.

10. Test engine.

That should do it.

Thanks for using FixYa.


Final note... if it does NOT start after this there are other problems we can discuss. i.e compression and spark "how to."

Posted on Apr 23, 2010

  • 2 more comments 
  • Kelly
    Kelly Apr 27, 2010

    Just doing a follow up. Were you able to resolve the problem with your pressure washer?

    If you need more help just ask.


  • Kelly
    Kelly May 03, 2010

    Hi. Do you know the exact engine model number on this unit?

    I do not think it is the pump UNLESS you are noting a substantial increase in pressure (noted by the force felt in the gun) over that same minute.

    I need to know if it passed this test? (Float bowl is removed)

    6. Using a catch fuel container turn on the fuel selector. Fuel should flow at a good rate. GENTLY lift the float assy level and make sure fuel flow shuts off. When you drop the float again fuel should flow.

    (It should pretty much fill a spray can lid after 30 seconds or so.)

    If you do not have fuel flow at this point the needle and seat will need to be inspected. Fuel selector OFF.

    I think we are still dealing with a fuel starvation issue. Having the engine model number we can sort this out and SOON.


  • Kelly
    Kelly May 03, 2010

    My apologies... I just read that you said the float checks were fine.

    If the float checks were fine... then it is time to break out the carb cleaner and start spraying. What my concern is that is sure does seem that the float bowl is full when you start it and is vacated after about a minute of under load use.

    If there is a fuel manifold on the side of the carb remove the manifold nut and inside of the maifold there is a white mini-screen / filter that can and does clog. It is like a 1/ 4 in high ring that sits inside of the manifold itself. (If installed)

    The only other things that come to mind are an in line filter bowl just off the tank or an actual fuel filter that is restricted.... We still have not ruled out a restriction in the gas tank outlet.

    Time for me to stop babbling and wait for your response.


  • Kelly
    Kelly May 04, 2010

    Thanks for the update. The pump was doing a trick we call "dead heading!"

    It must have been some pretty awesome pressure :) Glad your back in the power washing mode.


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