Question about Karcher 2500 PSI Pressure Washer

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Tecumseh Snow King HS40 engine only runs on full choke, no power

OK, have a 5 horse snowblower powered by a Tecumseh HS40 engine. I was having problems starting it and keeping it going, new gas and draining carb and lines got it running. I though I was OK, but now a snow storm and I start the blower, get it running, but it will only run on full choke, stalls if I unchoke it. It also loses power under load i.e. when blowing snow and won' throw. Also, the muffler heats up to red hot - I assume this is not good. Any suggestions? Thanks in advance

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  • whcoy Jan 12, 2009

    I have the same problem with my Toro snowblower. The tecumseh carburator needs replacement if you cannot hear a clicking noise when shaking it while holding the choke and throttle flaps. The emulsion tube is stuck if this is the case, and because it is internal, the carb will need replacement. Be careful if you try drillng out the plugs as there is no clearance between the bottom of the plugs and the carb body making it very easy to drill through into the venturi. Hope this helps.

  • Anonymous Mar 23, 2009

    Same problem with HS40 Tecumseh Engine. Starts and runs on full choke only. No power when tiller engaged. Needle in jet corroded. float free.

  • supplier00 Apr 08, 2009

    I too have the same problem with my HS40 Tiller. Stumbled upon your site and your recomendations Thanks
    I will be replacing the carb as the whole thing is a mess and a new carb couldn't hurt. I have, however been looking for that carb with no luck for matches. The number I took off the motor is HS40 555 33H. It is corroded so I was wondering if this was correct. Thanks

  • eddiefast Oct 31, 2009

    I had this problem on a White Snow Blower with a Techumceh $S40 engine i bought in1988. After 5-10 years it started giving me problems but I was always able to get the engine running with the power it needed to throw snow. This year it was the same. I got it started in Sept. and it ran good, or so it seemed. The first Colorado was a good one and it did not want to start. I finally got it started after about an hour. Sonnded good but would not run under load. I am now on the web looking for a Briggs and Stratton or a Honda engine to replace the Tecumseh. I have just had it after all these years. New replacements on the web are around $250 to $350 and the price will be worth it. Think I'll add electric start as at 62 I feel I don't need the stress anymore.

    Eddie

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I did and thanks - just picked up one that does the same thing and i plan to take your advise

Thank you Jerr

Posted on Feb 15, 2009

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  • Karcher Master
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Mefco, your carburetor is probably dirty, plugging some of the internal ports and or jet. I will add detailed links to show how carb is cleaned. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
HOW TO Clean Rebuild Tecumseh Snowblower Carburetor PART 1 OF 4
How to Fix Snow Blower Carburetor
Tecumseh Carb snowblower cleaning 1 of 2

Posted on Aug 10, 2016

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I had a snow king do this. It turned out to be the key on the crank was just about sheared. Did the need for use of full choke come on gradually?

Anyway, that was easily repaired but now won't start. I have fuel and spark with compression.

Latest think for me to try is adjusting the valves with a non-OEM method.

Posted on Feb 02, 2011

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SOURCE: I have a 13 HP Honda that won`t run unless choke

You most likely need to set your valve clearances. If it is hard to pull over or the recoil snaps back after starting your valves need to be set for sure. This may not be the entire problem but it is a good start. Also change the spark plug, a bad plug will cause odd problems and is too cheap not to eliminate as a source. In addition check your fuel, pour a little out into a white container (I like spray paint can caps for this) and look at the color. If it is yellow to orange it is bad. You can pour it into you car, the car electronic sensors will compinsate for it quality but a small engine can't. Use a NGK BP6ES or BPR6ES plug.
You need:
Feeler gages
10mm open end wrench
14mm open end wrench
1 long shaft screw driver or rod
1 spark plug socket and ratchet

Remove the spark plug and the valve cover. Pull the recoil over slowly until the intake valve opens (intake is closes to the carb and it will go down when it opens). Now put your long screwdrive down the spark plug hole. Slow pull the engine over until the screwdriver handle is at it highest point, this is top dead center. It may take a few attempts. Now check your valve clearance between the rockers and the top of the valve. The intake should be .006 and the exhaust .008, both can be +/- .001. To adjust: hold the large nut with the 14mm then loosen the small one with the 10mm. Lefty loosey. Now turn your large nut until you get the correct setting and then tighten the small one the lock it in. It may take a few attempts and alway reverify your setting after you lock it down. Once done, find top dead center again and reverify. Now your valves are set.

Posted on Mar 31, 2009

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SOURCE: EXCELL VR2500 power washer runs and then stops

I had the very same problem and nobody could help me until I was talking with a co-worker. Its a very easy fix. I couldn't believe it. I did this yesterday and it ran like a charm. You can either replace the head gasket or just by a good sealer to use on your existing gasket or replace it. I use Indian head gasket sealer on mine. The bolts on the bottom were lose causing a loss of compression. If you need more info you can email me (for free) and I will tell you exactly how to do it. Agr8flson@aol.com

Posted on May 31, 2010

  • 250 Answers

SOURCE: Karcher 2500 with Honda GVC160

Make sure the governor linkage is clean and works freely. A lot of times when you put a load on the machine, use it it stopps the fluttering.

Posted on Mar 19, 2011

Testimonial: "It is lopng pretty bad and will stop if let alone. This machine is about 2 years old and as I recal it started running rough in the middle of washing "

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I have a Robin eh 34 engine in a Simpson power washer. The engine starts and runs but wont rev much past a fast idle. Carb has been cleaned thoroughly. gas is fresh. Suggestions


Butch if carb was good and clean and linkages were re installed properly including governor, it is possible the throttle tab/lever (what linkage hooks to) is loose on the shaft that opens the throttle butter fly. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

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Rigid 3300psi Pressure Washer chokes after engine warms up. Then looses water pressure. What is the problem and can I fix it?


if the engine slows then so will the pump... and so will the pump power.

engines are all the same and so just google "servicing engines"

an engine requires fuel - air - ignition and compression......

if your engine starts and runs then it must have reasonable compression so check / replace / clean the fuel and air filters...
check the condition of the spark plug / clean it / replace it

after these basic checks you move onto measuring the compression and checking the carburettor which requires a level of skill you may not have

oh, check the oil too !

if you have a make and model of engine (not pressure washer) the manufacturer may have service kits and service manuals... briggs and stratton / honda / tecumseh (you'll be lucky) / sumec linhai

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Engine on powerwasher starts but quits running after approx 10 seconds. Engine oil changed, oil is full & tried choke in various positions. Also has fresh fuel in tank. What else can I do


try cleaning the carb that ethanol plays havoc on these small engines if it is not a premix oil and gas unit add a little 2 cycle engine oil to the gas will keep the carbon builup to a minimum not to much it will gunk up your spark plug take the carb apart and clean it with carb cleaner or deisellet dry check your spark plug make sure it is clean and ok that is where I would start

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The engine starts cold after 2 or three pulls, runs ok initially, but seems to have slightly less power. After a few minutes I can turn off the choke. When teh engine warms up and runs for about 15...


I would first try draining the carb bowl, if you look at where the choke lever is and look below that you should see a clear red tube with a flat head screw below that, if you just turn the screw out the carb will drain. If you still have an issue you are going to have to clean the carb.

Oct 26, 2010 | Karcher G3025OH Pressure Washer

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Engine runs fine and then shuts off when I turn on sprayer


When the gun trigger is pulled, the back-pressure holding back the engine is reduced and the engine accelerates.

Your engine is dying when it should accelerate.

Good news is you have spark and combustion and fuel and the engine runs.

1) Check the exhaust port for build-up of carbon or dirt >>> the hot exhaust gas has to fly out of the exhaust port and if the port is clogged, then the engine stalls

2) Check the amount of fuel getting through to the carburetor >>> pull off the rubber hose entering carburetor from the gas tank >>> does gas run out freely? If gas does not run freely, then take apart your gas filter located just below gas tank

3) Remove air filter and see if problem continues. A dirty air filter can cause engine to stall since combustion requires oxygen coming through the filter. Replace the air filter.

4) Mess with the choke lever and see if you can find a setting where the engine works >>> our old power washer would never run when lever was moved to full throttle >>> we just left the choke lever at half throttle and the engine was happy

5) If above fixes don't fix the problem >>> the final suspect seems to be the carburetor >>> try some gun-out >>> maybe a trip to small-engine repair shop is required.

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What would cause a pressure washer to cut off after you pull the handle to get the water started


We used power washers for years

When you pull the trigger, the engine is supposed to accelerate because the back-pressure on the pump is released.

The back-pressure is why you're supposed to keep the gun trigger open when starting the engine. It sounds like you're starting the engine with no water passing through the gun.

Inspect the exhaust port >> if exhaust is clogged with carbon or dirt, then the engine will not run at high speed.

The problem may also be cause by a rusted choke lever. If you notice when a small engine accelerates, the choke lever moves up as the carburetor demands more gas.

Start the engine with water passing through the gun >>> move the choke lever a little bit at a time and see what happens. Keep water going out of the gun. When the surfaces are cool, spray WD-40 on the lever and see if you can free it up. WD-40 is extremely flammable.

If your engine will not fire at all by starting with water passing through the gun, then your gas supply might be limited or your carburetor gummed up. Pull off the rubber gas line that connects to the carburetor and see if gas flows.

Next, pull off the air filter and see if the machine runs good without air filter. You may have clogged air filter.

While the carburetor is exposed, spray WD-40 into carburetor. See if you can get engine up to full throttle while spraying WD-40 into carburetor. Keep spraying the WD-40. Keep the water flowing out of the gun.

If the engine throttles up all the way on WD-40 but won't run without it, then your carburetor is probably gummed up.

Our old power washer won't run with the choke set at full throttle. We just got into the habit of leaving the choke alone. We'd pull off the air filter and spray WD-40 into the carburetor so the engine would spark healthy without messing with the choke at all. And we kept the choke about 2/3 open all the time.

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Thank you

Jul 11, 2008 | Karcher 2500 PSI Pressure Washer

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