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I have the same Problem, the leak is from the seam of the Manifold or on the pressure side of the Pump and the hose housing. In my case there is a small crack in the seam of the Manifold Housing. A manufacturing defect.. A New Manifold Complete Replacement about the half the price what I paid for this pressure washer at Walmart... :(
If under 1 year old, and you can find a receipt,Karcher will replace the whole Pressure washer under warranty.
remove the hose from the machine. Check that water is flowing. and there is no corrosion reducing the opening. If that is OK then it is the internal seals and pressure vallve on the pressure unit Cost to have it fixed by Karcher is $200
This may not be a motor problem. It sounds like your pump is not working properly and the motor is just following the pump. First thing to do is check for leaks in the pump, wand hose, gun etc. It may also be a blown water seal inside the pump.
Before you start it up:
1. Disconnect the high pressure hose
2. Connect the water supply and turn on
3. Make sure water is flowing through the pump
Start the motor, run for about 10 seconds and then turn off.
Turn off the water supply, connect the high pressure hose, turn water back on, start the motor and away you go.
Speed regulation on small engines is notriously fussy.
Check the linkage to the carburetor and look for a small, light spring.
If there are several holes for one end of it, you may have to try more than one to find the spring tension that lets the engine run steadier than it now does.
If not, then either replacing it or changing the length by shortening or lengthening it will probably be needed.