I am assuming this is a carburetor problem where it's not getting enough fuel once the choke is removed and is running so lean, it stalls almost immediately. So, several questions: 1. You won’t see one of these on a dirt bike because the choke circuit actually just adds more fuel to the mixture with the same amount of airflow. Mower died while cutting the grass. If so when hot, the choke plate should be open, as per picture. Here is the history of my problems. There are several passages in the carburetor that allow fuel to enter the air stream depending how the throttle is set. If the carburetor is plugged, the engine will be starved of fuel and will not run . If your chainsaw only runs with the choke on, it is likely an issue with your carburetor. If your motor requires the choke to be engaged (even slightly), it is likely time to thoroughly clean the fuel lines, filters and carburetor. These tiny openings can be cleaned with carburetor cleaner and compressed air. Use compressed air to remove any residual carb cleaner from each component. I … Get shopping advice from experts, friends and the community! Apply choke (if fitted) Pull start mower; Two common features of your Honda mower will dictate how you start it, Roto-Stop and choke type. After reassembling, it would only run when fully choked. It runs just as it always has with the choke on (good but short on HP) and I have even mowed twice with it on since. Access the pilot jet and clean it with carb cleaner, compressed air, and fishing line if needed. If your lawnmower will start and run with the choke on but dies when the choke is turned off, it may have a problem with the carburetor. Cleaning a carburetor isn’t difficult, but it does require the carb to be mostly disassembled. Sorry, your blog cannot share posts by email. This port leads to the air space at the top of the bowl. Its a Honda GXV (390 i believe). And stop. If the engine is still running, that means the gas cap may be the culprit. If the choke has to be halfway on, then the carburetor is running too lean. Check that the choke plate is in the fully open (off) position as per picture. The engine runs until the choke is opened. This air pressurizes the space above the fuel in the bowl, which forces fuel to flow out the main jet, into the venturi. What happens is fuel becomes a solid state as it evaporates and this plugs up the emulsion tube and the idle jet. Most carburetors can be cleaned and made to run like new again. Get shopping advice from experts, friends and the community! Turn the choke off and assess. If you need specific repair instructions related to your model, refer to the manual provided by the manufacturer. Choke on, flooding hot engine. its getting enough air, but in order to run right the engine needs the right amount of fuel/air. 1. I checked the throttle cable adjustment to the … I have a lawn boy zero turn with Honda engine. To understand this problem, you must understand a little about how a carburetor works. Some of the Honda carbs are set up so lean, they won't run without the air filter installed... that's cutting it close. Remove the main jet and the emulsion tube. The way I got the engine started was by taking off the air filter and spraying alot of starter fluid in it. Answered I have a typical small engine power washer which was running fine the first day I used it this year even on the old fuel. When I start it up, I have to have it fully choked. It sat in my shed until this summer when I pulled it out put it together and put all fluids in and tried to start it. The idle circuit could also be in play during this start up. I found that the float was stuck. When the mower has started, the throttle should be moved to the run position. Remove the bowl and drain any fuel out of it. This creates additional low pressure in the venturi and also forces air to be drawn through a port on the front of the carburetor body. Ultrasonic cleaners do an amazing job of cleaning the tiny openings and passages in a carburetor. The unit will run about 1/3 - 1/2 choked, but dies it I try to remove it completely. I’ve got the 4 main things for you to focus on to help diagnose and … My Honda EU3000is only runs with the choke on. Depending on the specific mower, it can be cheaper/faster/less drama to simply replace the carb. The transition circuit, for when the throttle is transitioning from idle to full. I checked the choke … Thx for all the great advice on this thread. Same issue with pressure washer and vintage Motorcycles (Only run with choke on). Jump to Latest Follow 1 - 12 of 12 Posts. Search Fixya ... My Honda 160 push mower starts and then runs rough and or a little arratic and puffs of black smoke blow out of the muffler. To understand this problem, you must understand a little about how a carburetor works. When I open the choke and try to give it gas, it sputters and wants to die. One day I ran the mower out of gas and once I fueled again, it will only run with the choke on. Notice that there is a gasket that seals the bowl to the carburetor as well as one to seal the bowl screw. Copyright © 2021 eReplacementParts.com Inc. Metal picks, wires, or other tools can easily alter the size of the openings, changing the amount of fuel that can flow through them. Next is the pilot jet. It will start and idle smoothly as long as it's fully choked. This will cause fuel to continue to flow into the bowl and spill out of the carburetor’s throat. and yet another reason why I DRIVE diesels. The carburetor brings air and fuel together and mixes them in the perfect ratio for combustion before they enter the engine. So, a far too lean air/fuel mixture is why your bike only runs with the choke on. 2. 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