Question about Karcher 2500 PSI Pressure Washer

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Washer wasnt use in over a year when i started using it it work ok not to much power though and then it increased power and then starting blowing alot of black smoke from exhaust. when i tried to start it again after putting new gas it starting back firing and then would shut off.

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  • Thomas F. Schneider May 11, 2010

    Black smoke is a sign of "excess fuel".
     Backfire is usually a sign of "out of time"


    I woudl check to see if the flywheel woodriff key is broken or sheared.
    Just a hunch. 

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5 Suggested Answers

  • 18 Answers

SOURCE: Karcher 2400R

You have a poor signal to the spark plug usually caused by a rusty fly wheel found underneath the pullcord casing. clean it with releasing ajent such as wd 40. common when not in use for a while.

Posted on Sep 19, 2008

  • 174 Answers

SOURCE: gas tank leaks, raw gas out the exhaust

Get the leak fixed

Posted on Jul 19, 2009

jmgldsmth
  • 1869 Answers

SOURCE: new Karcher pressure washer won't start

replace the fuel carburetor filter and, or, your fuel tank filter

Posted on Aug 31, 2009

  • 1 Answer

SOURCE: Once the trigger is released it won't starting spraying again.

I have the same problem. This is the responce for Karcher......

The unloader valve may be sticking, or is dirty. It probably needs to be cleaned and may need to be replaced, it is inexpensive. It gets a lot of use, but extends the life of the pump. The function of the unloader is to allow the machine to run in a bypass mode while the trigger of the gun is closed. First, a lack of high pressure can be caused by: 1. Insufficient water feeding to the unit, so check that the water is turned on all the way and that there are no kinks in the hose. 2. The inlet filter may be clogged. (it will need to be removed and thoroughly cleaned). 3. An internal water leak. 4.Also, low pressure can be caused by worn spray tips. If you have checked the first three with no resolution, the problem is internal and could be as simple as a sticking unloader valve. If you are mechanically inclined, you can clean this valve yourself and greasing the o-rings (use lithium based grease), or take it to a local service center. You do not need to take the pump apar
t. The unloader valve is located under the cover, and is secured with 2 bolts. (Use needle nose pliers to remove the valve) For those units with pressure and volume controls, the unloader is located under the pressure and volume control knobs themselves. Do not take any other bolts off or you will open the pump and lose the pump's oil.

Note: Lithium based grease will prevent future failure of the unloader valve.

Also, check websites such as fixya.com for tips and how-to info particularly on cleaning the unloader valve. Be sure to use lithium grease if you reassemble it.
I am going to check the manuel to see where it's at

Posted on Sep 24, 2009

wireguy212
  • 1627 Answers

SOURCE: I have a Husky 2600 PSI power washer with the

You can eliminate the motor by unbolting the pump from it and then if it will start the problem is with the pump or the unloading valve.If it does not start with the pump removed then you check for spark and get the carb cleaned or have a kit put in it.If it does start then check to see if the pump turns freely,if so disassemble the unloader valve and clean and lube it so that the pump and motor can relieve the pressure it needs to when the trigger is not engaged,if the pump can't be easily turned by hand then then pump needs to come apart,dealership should do this.

Posted on Apr 13, 2010

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