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  1. May 24, 2021 · The Challenge website suggests this...”it is most likely that the jets are blocked inside your carburettor... you can either try cleaning it yourself (purchase a 'carburettor cleaning kit'), or taking it to a local garden machinery centre for a service.”

  2. May 9, 2016 · 05/09/2016 9:38 PM. The reason it does that when getting low on fuel is because it is now sucking in air from the tank as well as what fuel remains, fuel level in the bowl drops and the mixture becomes lean. Hunting is generally a result of a too lean mixture. A couple of things to try.

    • What Is Engine 'Hunting'?
    • Checking The Fuel
    • Replacing The Fuel in Your Lawnmower
    • Check The Air Filter
    • Sponge Air Filter
    • Paper Air Filter
    • **If It Is Still Hunting - Carb Jets:**

    This is when the engine revs up and drops back down rapidly on a cycle. It is usually caused by a lean fuel mixture - ie.) not enough fuel in the fuel-air ratio. This is controlled by your carburettor and governor.

    Please make sure that you are using unleaded fuel that is no older than 30 days.
    If the fuel you are using is older than 30 days, please remove and replace the old fuel.
    First, please remove the air filter from the lawnmower.
    To remove the air filter, unclip the filter cover on the side of your engine.
    Some models may use a securing screw which can be removed by hand or using a screwdriver.
    You may then remove the existing fuel by unscrewing the fuel cap, tipping the lawnmower onto its side and emptying the fuel into a container.
    Please identify whether you have a sponge or paper air filter.
    To access the air filter, please unclip the filter cover on the side of the engine.
    Some models may use a securing screw which can be removed by hand or using a screwdriver.
    A clean sponge air filter would be either grey or yellow.
    If you have a sponge air filter which is dirty, you may clean the air filter using warm soapy water.
    Please ensure you leave the filter to fully air dry before reinstalling.
    A clean cartridge air filter would be white in colour.
    If you have a paper air filter, it is not possible to clean the air filter.
    If the air filter is dirty or damaged then you will need to purchase another filter.
    It is most likely that thejets are blocked inside your carburettor(the part which regulates the fuel into the combustion chamber).
    You can either try cleaning it yourself (purchase a 'carburettor cleaning kit'), or taking it to a local garden machinery centre for a service.
  3. May 5, 2018 · My Mountfield HP185's engine is surging when running, it's one of the ones with a plastic carb which has no adjustment screws on it at all anywhere. Things I've done so far: Stripped and cleaned carb. Put fresh fuel in. Cleaned Air filter. Gapped spark plug.

  4. Apr 8, 2017 · Hi all I've got a Challenge Xtreme lawnmower with a Chinese SV150 engine. It starts well but hunts/surges really noticibly. I have stripped the carburetor down and cleaned it thoroughly with carb cleaner but no difference. I have tried new fuel which didn't change anything either.

  5. Oct 16, 2005 · My engine has started "hunting" (surging) lately. It does this at low throttle settings. It is slight, but there. Once the throttle is advanced, it runs strong and smooth. What should I look for to fix it?

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