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

Posted by mefco on

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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.


  • Dan Apthorp Jan 02, 2018

    I feel your carb is dirty. if there is a fuel cup on the bottom of the carb remove it and clean the cup real good and also clean the needle valve as well. I have more small engines that would not run right because the needle valve was either plugged or almost plugged.



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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


Dan Apthorp

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I feel your carb is dirty. if there is a fuel cup on the bottom of the carb remove it and clean the cup real good and also clean the needle valve as well. I have more small engines that would not run right because the needle valve was either plugged or almost plugged.

Posted on Jan 02, 2018


L Pfaff

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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

3 Related Answers

Phil Rivera

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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


  • 2 Answers

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. [email protected]

Posted on May 31, 2010

Tim Venetis

  • 259 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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If this engine turns over then try this. I am not sure if you mean starter won't turn or just won't start when turning over.
Take the fuel bowl off and clean it real good as well check the fuel jet and make sure it's not plugged. The jet in most engines is in the bolt you take off the bowl with. There should be fine holes in the bolt itself. I use my air compressor to clean mine.
If you want to try something first take the spark plug out and put a table spoon of gas in the spark plug hole and put the plug and wire back on. Try to start and if it fires up then stalls then you know its carb related.
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I assume this is on a snowblower?

Be sure you have fresh fuel.

You can also remove the bowl on the carb and spray carb cleaner in any orfice you see.

Always store a snowblower with fuel stabilizer in it. Otherwise it the fuel can "varnish" the inside of the carb and cause problem.

If it still doesn't start check compression.

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