Question about Karcher 2500 PSI Pressure Washer

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Won't hold proper speed and pressure. Cycles up and down.

The choke has been moved to off position after heating up but the automatic throttle hunts for proper speed as power cuts back and cycles back to proper speed.

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What i've done in past is, i used ''carb choke cleaner'' or ''intake cleaner'' started the engine and sprayed right in to air filter , that worked almost every time. this is a first thing i do before i start taking things a part.
this also happens after a long storage time.
DO NOT flood the carburetor cause it may damage piston or cylinder.(just do it gently).

Posted on May 30, 2009

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350 V8..revs itself and idles at higher rpm..tap excelerator and goes down to normal


if it is a carby engine then check the settings of the automatcic choke and the throttle cam screw settings
it works in a manner so that when you press on the accelerator the automatic choke flips a cam around and the idle speed screw rests on that cam giving a high idle speed until the engine is hot enough not to need a choke at which point the cam is held clear of the idle screw
if efi engine run the fault codes to check for problem accelerator position sensor or throttle position sensor.

Sep 04, 2015 | 1980 Chevrolet Corvette

1 Answer

How to adjust automatic choke


Procedure #1-
  1. Be sure the hook on the bimetallic spring contacts the choke shaft lever.
  2. Install the cover and retainer and lightly tighten the screws.
  3. Turn the ceramic element to align the mark on it with the middle mark on the housing.
~~~ Procedure #2-
  1. The engine must be cold to make this adjustment.
  2. Remove the air cleaner.
  3. Find the automatic choke. It's the round thing on the upper right-hand of the carburetor. There is a wire coming to it from the positive side of the coil.
  4. Note: The automatic choke is a round ceramic thing with the heating element wound inside of it. (The ceramic part may be covered with metal so that it looks just like the rest of the carburetor.) The choke is held in position by a triangular ring clamp and three screws so it can be loosened and rotated for adjustment.
  5. Pull the throttle arm on the left side of the carburetor down to free the little step arm (cam) that the screw at the top of the throttle lever rests on.
  6. Note: This stepped "cam" is connected to the butterfly valve inside the throat of the carburetor by a shaft that extends all the way into the automatic choke. With the engine cold, the butterfly valve should be closed. As the engine warms up, the coil inside the automatic choke uncoils, opens the butterfly valve, and moves the cam to reduce the idle speed.
  7. Release the throttle arm so that the return spring snaps it back. The little screw at the top of the throttle arm (again, with the engine cold) should now rest on the top step of the stepped cam. This sets the hi-idle, which is needed together with the choke on a cold engine to provide sufficient idle speed to keep the engine running until it warms up fully.
  8. Loosen the three screws on the right side that hold the choke in place.
  9. Keep your eye on the butterfly valve in the carburetor throat.
  10. Turn the choke element clockwise (viewed from the right) until the butterfly is standing straight up, then turn the choke counterclockwise (viewed from the right) until the choke butterfly fully closes (barely -- not too tightly), then tighten the three screws that hold the choke in place.
  11. Note: This is important; the automatic choke may be assembled wrong and not catching the hook on the coil spring at all.
  12. Start the engine with the air cleaner off. As the engine warms up, make sure that the butterfly opens until it is standing straight up (full open) when the engine is fully warm. If it doesn't, readjust the choke until you get it right.
  13. Note: The engine is now warm, so you won't be able to adjust the choke per the foregoing. Note the position of the notch on the side of the choke relative to the three little ridges on the body of the carburetor. If the butterfly is too far closed with the engine warm, turn the choke clockwise just a bit to straighten it up. The notch on the choke should never be too far outside of the three ridges on the body of the carburetor. If you are not able to adjust the choke using these method, something may be sticking, or perhaps the coil spring inside the canister is broken, or perhaps the wire has fallen off of the contact on the canister so that it is not getting power from the battery properly.

Jul 15, 2015 | Cars & Trucks

1 Answer

Trimmer just idles will not run full speed


check your choke cable for proper function; at full throttle, butterfly valve should be perpendicular to the throttle body. Also check your fuel filter for contamination. Stone should be all one color, and free to follow the fuel supply as you move the trimmer into different positions

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1 Answer

Why does troybilt generator engine keeps shutting off when throttle is moved from choke to run position?


Give it a shot of starting fluid. If it runs initially, then most likely the jets on the carbureator are clogged. You should remove the carb and clean/rebuild it.

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1 Answer

1991 Honda Accord Miss-fires dies


I would try replacing the ignition control module and the distributor pickup as the next most likely cause of this problem. Also I would do the following

This problem can be caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control



Jun 20, 2012 | 1991 Honda Accord

1 Answer

Hi i have a 019 l stihl won't start plug is fairly new with my glasses on i can't read the position's to start and have no manual


Not a great Stihl fan, however they usually have a single stop start, choke and half throttle lever, depress the throttle trigger and at the same time pull the lever fully uplet go of the throttle trigger which should now be lock up, this will engage the part throttle and choke, crank the machine until it fires once, then move the lever down one notch and crank again until it fires up.

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2 Answers

14" CRT 3.5 hp tiller,


Make sure your Air cleaner is not obstructed. Clean it!
Check your spark plug for the proper gap. Adjust your
LOW speed throttle screw. It may not be getting enough fuel flow. Check your fuel filter screen (Inside your gas tank). Good Luck

Sep 19, 2017 | Craftsman Garden

1 Answer

Will only start and run in choked position, when throttle applied chokes out. If started with out choke and throttle position in low speed will start and run for 10 sec then like it runs out of gas.


i have your solution guaranteed, I fixed mine yesturday remove H L screw plastic caps and on high 11 threads exposed and on the low side 8 threads exposed. removing the plastic caps allows u further adjusting these wear out or move soo just take them things off and you will be rolling

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2 Answers

Honda mini tiller cuts off when start tilling. runs great when held above ground with no load. cut off seems to be associated with the movement and shacking when tilling ground.


Hi thermo259, sounds like the high speed adjustment is lean, find the high speed screw and turn it counter clockwise 1 half turn and see if that helps. Should cure it.

Dec 10, 2010 | Honda 25cc 4-cycle Mini Tiller

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