Repair guides and support for gas, electric, and human powered machines used to cut grass, whether push style, or ride-on. Work the mower in the usual way until it stalls, then go ahead and follow these steps: If the mower starts and runs as normal, your gas cap is faulty, go ahead and replace it. Clean accordingly. Repeat Try another spark plug to eliminate a faulty plug; failing to test with a second plug means you could condemn the armature in error. And, I got my nap. The gas flow gets too little for the engine to run. It is now healthy and happy and runs like a champ. Check out the Amazon link below for common lawnmower armatures. From her description, we agreed that it was either a fuel or air problem. An easy way to see if excessive oil is the root of the problem is to lean the mower on its back for two hours. Sharpen and balance the lawnmower blades. Now turn the flywheel until both valves are closed. (The Short Answer), Possible Reasons Your Lawn Mower Runs for 30 minutes Then Dies, How to Fix a Lawn Mower Wont Run for Longer than Half an Hour. Most problems that will cause a John Deere lawn mower to stall after 20 minutes occur due to the distribution and rate of flow in the fuel and air systems. So you have good flow from the fuel line at the carburetor correct? If your lawn mower starts, runs briefly, then dies these are the four most common reasons that's happening: Dirty carburetor / clogged carburetor bowl. social. Customer reviews and photos may be available to help you make the right purchase decision! Copyright Lawnmowerfixed.com 2018 Virginia, County Cavan, Ireland. Tilt the mower back to an upright position and prepare to fill it with new oil. Too much oil can also cause your riding mower to push oil through the valve train and into the cylinder. Gas Filter Blocked. Once the bowl has been removed, check for debris and build up. Step Four - Remove the Carburetor Bowl for Cleaning. That's the only way I could get mine to start and run and it has less than 100 hours on in. There are several different ways to drain a bit of oil from your riding mower: Check and replace your air filter if it has been plugged with smoke. We welcome your comments and suggestions. The filter shows no fuel in the chamber when it dies. Drain a little oil by removing the drain plug. MacGyver didn't get it right every time. Safety switch malfunctioning. I bought a used simplicity Sunstar 1692135 year 1995. Tractor stops running after 20-30 minutes Summer, 40-60 minutes Fall. Using vice grips or a clamp works very well for this. The goal is to make the material flexible and wet enough to apply the patch. Contents [ hide] 1 Diagnose the lawnmower shuts off when blades are engaged: 1.1 Step 1: Check the blades of the lawnmower. Good luck. Another reason your mower may die is when the wrong fuel is run through your riding mower. DoItYourself.com, founded in 1995, is the leading independent home improvement and repair website. Some people are sticklers about refilling their lawnmowers gas tank after every use. Checking spark isnt difficult, and its all covered below. Ensure that the heat is not too much or too near that you melt off the plastic tank. Newer lawnmowers have fuel caps that comply with government evaporative emissions requirements. Did you actually take the carb apart and clean out the jets? Solution: Loosen or remove your fuel cap and start your mower. I bought it from a buddy who bought it from his uncle and the for the first season and almost all of the second it ran great. Try to restart the mower. After about 10 or 15 minutes, the vacuum will become strong enough that fuel will stop flowing to the carburetor and the lawnmower will die. If not, replace it with a new air filter. And we make it easy! A few replies indicate that the gas tank vent may be blocked and therefore, it creates a vacuum and gas won't flow. I fixed it in about 45 min. JavaScript is disabled. A mower that shakes irregularly while idling or surges while in use is likely affected by a bad spark plug. If it is original, it doesn,t owe me anything, but sure seems weird. Also, you need to be careful not to overtighten this bolt. Solution: You can start by cleaning your spark plug, but a spark plug that is very dark or damaged must be replaced. Lets get testing so. Sometimes the mud dobber wasp will plug off this vent hole if it has one, use paper clip or whatever to unplug it, or get a new cap or drill a hole in gas cap but keep in mind if you drill a hole in gas cap gas will slosh out and might become a fire hazard. Same issue here. 2022 LawnMowerForum.com. F725. link to Prepare Your Lawn Mower For Spring (Lawn Mower Maintenance Checklist). Cleaning the deck will also help keep your cutting blades sharper for longer. Thanks for the replies. Possibly the fuel tank vent is clogged. The air filter and spark plug are new and gas is new from gas station. . Remove the dipstick and immediately place it in a small vessel to catch the dripping oil. Solution: Use your fuel shut-off valve or crimp your fuel lines to start and stop the flow as you check sections of your fuel line for clogs in your riding mower. If your riding mower's e engine runs rough or misfires, the carburetor could be clogged.. The battery is new, but it seems to be a fuel issue. Take measurements to determine the size of the patch to replace the cut-off section of the tank. Tilt the mower in the opposite direction of the engine air filter to avoid oil contamination to start draining. May 2, 2010 / cub cadet stalling after ten minutes running - recovers when i turn off the blades #6. I had another problem with my mower.. You answered the first one about the clutch.. I need help, I have cleaned every thing, and checked everything I can think of, again, I NEED HELP !! Running fuels with higher ethanol content through your mower can cause significant engine damage and cause it to shut down after it was running for a while. Spray carburetor cleaner into the air intake. Other possible causes include: Stale/Dirty Gas. The best way to avoid this is to hose off your cutting deck after each use. The air filter gets dirty quickly, so clean it every eight hours of operation. Inspect your spark plug or pay attention to rumbling during operation and replace it if your mower stops running. Bobby, I did get your thanks. Ethanol in your gasoline along with the moisture it attracts can gum up the fuel system causing clogs. From her description, we agreed that it was either a fuel or air problem. You are using an out of date browser. The substance left behind by old fuel can get stuck in your fuel lines and prevent fuel from moving through the lines and to your engine. Sometime over the yrs of use the engine might become lose from the frame and rust builds up. Thinking it is a carb issue or coil. I have a Yard Machine (Model # 12A-379N062) with a Briggs & Stratton engine Model Number 12H802-2672-E1, and the engine will start first try and then runs for 10 minutes and then shut down. This is a push mower Craftsman about a 4 hp. The spark plug works with the ignition coil to create a timed spark in the cylinder, causing combustion. No issue with B & S engine. Menu Ask a Question Share a Post Account Search. This is the info I can find on the mower. Make sure that the fuel cap is in good condition and has a vent that works properly. With our Fix app, you always have a personalized repair guide on-hand. Starting cable connectors loose. Next time it starts to happen loosen the gas cap to allow air in to prove problem. As soon as you take it off, it should start flowing, so be careful. Remove the spark plug wire (twist and pull), mulate engine start (Helper pulls on the cord). If it starts and continues to run, replace the cap. This gap is where the spark is produced. The fuel cap creates a seal in the fuel system and when it fails to provide a functional seal, a fuel flow issue ensues. Thats when well check for spark. A clogged fuel filter can also cause a mower engine to die. I headed out to the garage intending to check the gas cap vent first. If you have spark, your armature is good, and its likely you have an over-fueling carburetor issue (see below) usually caused by a faulty auto choke system. The spark plug on your lawnmower should be replaced at least yearly to ensure trouble-free operation. When this happens, the spark plugs are unable to get the voltage needed to work properly. Gas Line Blocked. @deser. Replacing the plug is easy to do. Work the mower in the usual way until it stalls, then go ahead and follow these steps: Remove gas cap. Dont reuse the baster for cooking purposes. In fact, virtually all other problems mentioned in this guide are at least somewhat connected to the carburetor and flow of fuel. Find out more about the negative results of too much engine oil here. Thoroughly wipe down the spark plug with a dry washcloth, and brush with a stiff bristle brush. Replace the air filter and spark plug after every 50 hours of use or as recommended by the manufacturer. Startup the lawnmower to warm up the oil allowing for easier drainage. A fuel siphon works great for this. This is what I have done so far. What a pain in the jacksie! After taking a look at the air filter, the next place I would investigate is the fuel cap. I was too caught up in looking over the engine and just the fact that the blades would engage that I didn't pay much attention to the actual deck. Any ideas? Always a plus! Keep hands and feet clear of the mower blade as the engine is cranked over. After cleaning the spark plug, check for visible signs of improvement in your lawnmowers performance. I just have to relate this story. This increased pressure can cause your riding mower to overheat and die. Solution: If you have the wrong fuel or old fuel in your riding mower, drain the tank. Remove the bottom hose to check and inspect this fuel filter. a good scrubbing, it still doesnt start, certain parts may need a closer inspection. There is usually a large plastic cover protecting self-propel mechanism that should be removed prior to accessing the carburetor. The base also has a second electrode attached to it. Did you read this thread? The ceramic insulator also isolates the center electrode electrically from the spark plugs base. I did solve the running problem.. Finish by replacing the spark plug wire. We are compensated for referring traffic and business to Amazon and other companies linked to on this site. 19 hp Kolher courage engine. An important part to mention is main jet. The line will collapse internally but look fine out side. The choke spring was broken and I replaced it. The spark plug is really a very simple device. Before removing the carburetor bowl, you must first pinch off the fuel line. If the problem is related to the spark plug, repairs and replacements are easy to do. Your engine requires clean air to run. Check the level and quality of the engine oil. When I called to let her know that I had arrived, she told me the John Deere rider had stopped after about 15 minutes and she had to get the neighbors to help push it back to the house. Unplugging the spark plug before removing the carburetor bowl has two main advantages. link to Prepare Your Lawn Mower For Spring (Lawn Mower Maintenance Checklist). However, when fitting the armature, an air gap between the armature and the flywheel must be maintained in order to generate a sufficient spark. John Cunningham is an Automotive Technician and writer at Lawnmowerfixed.com. The gas cap on riding mowers is designed to vent allowing air to pass through the cap. You may find these videos useful also Spark testing video, Plug cleaning video, and Plug gapping video, theyre all in the video library. Ethanol is an environmentally friendly fuel option added to gasoline. One of lifes greatest enjoyments is sitting back and relaxing in your own backyard oasis, sipping your favorite beverage. With the metal spatula, apply light pressure to set the patch in place and remove bubbles that may surface. Make sure the carburetor mounting bolts are tight. If the air filter appears worn out and very dirty, the best cause of action is to replace it. Gas Tank Blocked. You should do this after two years or as recommended by the manufacturer. 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