Honda GX 160 on a sprayer used for herbicide application. The engine starts fine when cold. Begins to sputter and the stop, may happen after 20 minutes of use or 2 hours of use. Will restart but quits right away until the engine is fully cool. Have gone through the fuel system with no apparent problems found. The oil level is fine. The first time this happened, the plug appeared fouled so cleaned but the problem persists. Is this eletrical, maybe coil or low oil sensor malfunctioning?
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It could be the type of usage and the duration of the runs are too short for the engine and the oil inside to reach normal working temperature. Lots of cold starts and short runs will inevitably cause some fuel contamination of the engine oil due to the relatively large quantity of fuel used during a cold start, much of which is not burned and some of which will find its way into the oil.
An hour of normal use would usually be enough to evaporate most of the surplus fuel from a small number of cold starts but some fuel residue will always remain, often leaving behind a fuel odour for those with a sensitive nose. This would be exaggerated if the oil pan capacity was quite small but the residue will do little harm over the short term in a quality oil.
It is possible there is a fuel problem, such as a small amount of fuel leaking past the carburettor float valve, which if there is no fuel tap and the system is gravity feed, some could find its way into the engine intake.
In this case cold starting would be possible without engaging the cold start enrichment and it might be noticed the oil level never seems to reduce or even begins to rise and fuel consumption would be noticed to be higher than normal.
If the engine is being used in a cold climate it is possible it is over-cooled and even when worked hard for long periods the oil doesn't reach a high enough temperature for it to do its job properly.
carburetor float is either bad or sticking.shut fuel off remove fuel bowl 10 mm bolt once removed pull pin out of float and inspect it at the same time re open fuel valve to allow fuel to push any debris the might be still in the port.re install float and test by slightly pushing the float upward and turn fuel on no fuel should drain unless you release the float if float has any fuel inside replace it if not finish putting it together and problem solved:)
I look up honda engines at : honda-engines-eu.com they have the best access to detailed information. If you can identify the carb butterfly, any cable should attach to the butterfly control. I see a Honda GX100, but not a GX31.
sometimes the tube/straw on the inside of the sprayer where the water comes thru falls off its connection.If you put the end of the hose in the sprayer you may have knocked it off.Depending on sprayer it can be easy or a pain to put back on
Sounds like your thermal relief has popped and is not reseting. These are an easy replacement. Usually availble as a "thermal relief valve" in sizes 3/8npt or 1/4"npt ..national pipe thread. Might also mean that your pump is overheating. Check and replace the pump oil. Make sure you do not allow this sprayer to sit and run without triggering the gun every couple of minutes.
It is recommended that gardeners have at least two sprayers, one for herbicide and one for pesticide. This is not a sales gimmick, the residue from many herbicides is difficult to completely remove form inside a sprayer tank. This leftover residue could potentially harm other areas if the sprayer is used there. Plus, it's not a good idea to mix pesticides. Make sure you label each sprayer appropriately.