Kohler engine backfires when shut off. EFI may solve these issues and wonder if a upgrade kit to EFI is available. Usually the Kohler's backfire after shut down due to unburnt fuel in the carb. But I like to just turn it off. That is when it backfires, if i let it idle for about a minute it won't backfire. 0 HP Starts fine then surges and backfires. Access the Kohler Engine troubleshooting guide. Heres what he described: On start up, while cranking, it is backfiring (through the exhaust) while the throttle The loud bang heard is the sound of this fuel igniting inside the muffler when the engine is shut off. I would start with the simple things like-- (1) Clean engine cooling fins. Compression and leak down tests can point to, or possibly eliminate, head gasket and valve problems, both likely causes of backfires on these engines. When I go from full throtle or 3/4 and shut it off it really bangs. The exhaust smells like its running lean. That means your motor doesn't start because it gets no gas, or it backfires, because it doesn't shut the gas off, after the ignition is off. Sep 11, 2020 · It has to do with the fact on the Kohler engines the fuel shutoff solenoid only blocks the high speed jet but still allows the low speed jet to draw fuel. What's the fix? I want to remember this is a timing issue?? Hello -- My friend has a 16HP Kohler vertical shaft on his Craftsman lawn tractor that has started to do something odd that Im hoping the experts here on Red Square have some ideas on. the fuel solenoid on the Kohler shuts off the main jet of the carb but not the low speed idle circuit. It starts up fine, but seems to want to backfire when not under Backfiring is a startling explosive sound that can happen when you shut down your lawn mower or other small-engine-powered equipment. Hello All, I own a model 417A with the Kohler KT17series 2 engine (468 hours). The Briggs will backfire very loudly right after it's shut off after running for a while ( and having been allowed to run at idle prior to shut off) and the Kohler (it has twin Now the mower will start just fine and run good. That is pretty annoying. What are the causes of this and how do I fix this? I know it's a different engine, but I had the same problem on a 15hp Kohler last year. Afterfire happens after the engine has stopped. I have a Kohler engine on my lawn mower and it will backfire after mowing if you shut it off right away. When I start it again it back fires and starts right up. Kohler dieseling at shutdown What model and spec is your engine? Most likely your engine is equipped with a anti-after fire/fuel stop solenoid. However, both backfire and afterfire are unsettling for the driver and the vehicle. Immediately after it shuts off you can restart it with about 1-2 seconds of cranking. After its gotten hot, it will run-on (diesel) or backfire upon shutdown. There are quite a few reasons why your Kohler engine loses power under load. Any ideas? Afterfire, on the other hand, is a phenomenon that takes place after the engine has been shut off. 5 acres of grass in under two hours and under a two gallons of fuel. Starts great runs great doesn't use oil. Kohler recommends that their engines be shut down at full throttle. they say shut it off at full throttle, I do. Have a craftsman t210 with the kohler 5400. You can mow for about 10-15 minutes from the time the engine is cold till it backfires loudly through the exhaust and shuts off. IF you suspect the low idle is too high when throttled all the way back, you can check that with a mini-tach. Allowing the engine to idle from 30-60 seconds before turning the key to the OFF position will generally prevent this after fire condition. Besides, oil leakage and excessive vibration are commonly seen. It has a lot of power and starts up pretty quickly. If you let it run for a minute or so at idle it will never backfire. Most of the solutions seem to be linked to the fuel shutoff solenoid operation. Put new Yeah the pulse hose actually runs off #1 cylinder and it pulls extra fuel into the cylinder causing it to backfire on start up especially and one big backfire at shut off there is actually a service bulletin Exmark came out with to replace fuel pumps and to get rid of the rn9yc spark plugs if u it is under warranty Exmark pays for a new fuel Backfiring is a startling explosive sound that can happen when you shut down your lawn mower or other small-engine-powered equipment. I let it idle down and move the throtle back to the start/stop position and shut is off. turned out to be that dang fuel bowl solenoid that pulls fuel in during Engine overheating could also cause this problem. "The good thing about the Internet is you have a lot of people with a lot of opinions. 19. The common 27 HP Kohler Engine Problems most users notice are overheating, starting failure and rough running. backfiring through muffler - Hi All, I had a friend give me a Wheel Horse 310-8. . If your lawnmower makes loud bangs or pops on shutdown, afterfire may be the problem rather than a backfire. When I shut it down it usually backfires. It is important to learn and remedy the cause of your lawnmower engine backfires. What causes a Kohler engine to backfire through the carburetor? I’ve had my fair share of experiences with Kohler engines backfiring through the carburetor while playing golf. What causes the engine to backfire when I shut it down? It only backfires once and usually just as the engine stops turning. Flywheel Key? ⭐ Don’t Throw Away Your Old Lawnmower — Build THIS Instead On Kohler the recommendation is shutting down at full throttle. Trouble with your Rehlko Engine? Use a systematic approach to identify and correct issues. I tried everything. When winter gives way to spring, it’s time to clean up the outside for garden and barbecue get-togethers. Does your head flare up when your Kohler engine dies when hot? Today, we’ll go over how to solve this issue of yours. Afterfire occurs after the engine has been shut off. Explore Kohler engine troubleshooting guide to fix starting, fuel, and performance issues, ensuring reliable operation and longer engine lifespan. 5 HP often stems from a faulty electric fuel shutoff valve that fails to retract, disrupting fuel flow. I acquired a zero-turn mower from a neighbor last year with a Kohler Command 25 hp engine. When I purchased it I always got a couple of backfires after I shut it down. Look for a long cylindrical housing securing the fuel bowl onto the carb. By effectively blocking fuel flow to the carburetor when the ignition key switches to the "Off" How the Kohler carb works at shutdown. In a few seconds it backfires. If so you need to shut the engine off at when the throttle is at 1/2 to full throttle. so I played around a bit and yep at idle backfire every time when shut down - 1/4 throttle almost never. I dought if your model has either since my 1982 C175 does not. I cant find any screws Outdoor Gasoline and Electric Powered Equipment and Small Engines - Kohler Command turns over and backfires but won't start - I have a ten year old Dixon ZTR with a Kohler Command engine. Also, if you don't idle down before shutting the engine off, the next time you start it, there probably will be a puff of black smoke for a moment when it starts. Is this timing? And if so, how does one set it? Engine Backfires on a Craftsman Riding Mower with a Kohler Command Engine. New member here and clumsy hobbyist. Note : JD mower engine twin cylinder don't remember if briggs or koler- in manual states not to shut unit down in the idle mode will lead to backfiring- counter intuitive eh . Even after a short period of operation (1 minute) and a couple of different throttle positions (full, idle), I get a nasty backfire out of the exhaust when I shut it off. The reason on Kohler engines the fuel afterfire solenoid on the carb doesn't shut off the idle circuit of the carb, therefore shutting down at idle allows fuel to be drawn in and unburnt into the muffler where it is ignited. Jul 31, 2010 · The coil can break down and not provide high enough voltage, or it can cut off all fire instantaneously and cause the backfire you hear when fire returns. 8 Kohler Engine Problems: How to Fix Them? Does it backfire when shut off, or when you restart it? If the former, let the engine idle for several minutes before you shut it down to allow the muffler to cool. I have a 25HP Kohler Command on my Grasshopper 725K. If troubles persist, contact Rehlko Customer Service. 5 hp engine. It is about a 6 yr old Craftsman DGT 6000 27 hp Kohler twin , It was my late Fathers tractor. Troubled by your Kohler engine's common issue of running, then dying? Discover easy fixes and instructions to resolve this problem and keep your Kohler engine running smoothly. Backfiring in the Kohler Pro 17. 25HP Kohler Command runs-on ("diesels") and backfires upon hot shutdown, even if allowed to idle several minutes. This can be caused b this 19hp Kohler has given me nothing but fits since I got it 3 years ago on my Ariens 42" rider. Note: Backfire and afterfire through the carburetor will not harm the engine at all! Find out the most common causes and possible fixes for engine backfire and afterfire. , while the engine is running or while shutting down. By watching this video, you will see the fix to my surging motor. Ignition problems are the most common cause and can usually be fixed by cleaning or replacing the spark plug. Why lawn mower backfires? Discover shocking reasons behind mower backfires and learn the top 7 fixes to prevent damage and ensure smooth operation. But after idling about 10 minutes it just shuts off. Outdoor Gasoline and Electric Powered Equipment and Small Engines - Kohler Courage SV591 surging and backfiring - It is on a cub cadet LTX1040. I believe this could be your issue if you have one of these courage motors on your mower. It runs excellent otherwisejust got done mowing 2. Mechanic's Assistant: Do you have fuel in the tank? If so, is the shut-off valve open and is the fuel clean? Customer: Yes, it has fresh fuel, and the shut-off valve is open. This happens at all engine temps. The fuel solenoid on kohlers only shuts off the high speed jet of the carb, and not the idle jet. Idling down usually helps this as the fuel then has time to be used off before the engine dies. Every time i turn off my Kohler engine, it backfires. Glenn This repair works on most small Engines Briggs & Stratton Kohler Kawasaki This repair is on engines like Briggs and Stratton Kohler Kawasaki etc. Some engines have a selenoid that stops gas flow through the internal jets of the carburetor or shuts the throttle butterfly off completely. when at idle the engine can pull fuel from the low speed jet when shut off causing the afterfire. Any Kohler engine with a fuel shut off solenoid on it should be shut off at half to full throttle in order for the system to perform correctly. Efficiently address issues for optimal equipment performance with expert guidance. I tried letting it cool down idle for a few minutes before shutting it off and that stopped the backfiring. A lawn mower backfires when the air/fuel mixture in the engine's combustion chamber ignites prematurely, resulting in a small explosion. I alway throttle down slowly to idle before I turn it off. IF the carb has a fuel solenoid shut off (most modern engines do) you can test that to be sure it is closing off. then it just started backfiring. Does this answer your question, or is there something still confusing about this? Jul 8, 2014 · If I shut it off right from high throttle it backfires really loud and shoots a long flame out of exhaust. 25 HP Kohler Command on a Bob Cat, Pops, back fires, and misses under a load. The Afterfire solenoid on the carb doesn't shut the fuel off of the idle jet in the carb only the high speed jet. I just lower throttle gradually and let it idle for a few seconds prior to shut off. I have since changed the spark plugs, points, condenser, coil, ignition wires, fuel and a Backfire is a condition described as a loud bang, poof, explosion, etc. Bypassing this valve can cause uncontrolled fuel delivery, worsening backfire. This article will focus on the most common problems that can occur with most Kohler engines at some point and how to fix them. That's another story too. Fuel shutoff solenoids prevent engines, including the Kohler brand, from backfiring. Outdoor Gasoline and Electric Powered Equipment and Small Engines - Kohler engine won't start. Jul 16, 2004 · When you shut the engine off ( especially from a high rpm) you load the exhaust with raw gas fumes. After four years of sitting I brought out my 81 C-125 Hydro. The primary duty of this solenoid that's now very often found securing the float bowl on newer riding mowers is to minimize backfire potential upon shutting down the mower. Fuel shutoff solenoids prevent engines, including the Kohler Most manufacturers will suggest to idle the engine for 30 seconds prior to shut-off, in an attempt to lower Exhaust temps, and allow for less intake/exhaust strokes to push fuel onto the hot muffler, to prevent backfires. After it's turned off, there must be a lot of gasoline leaking into the exhaust Kohler’s engine runs rough, stalls, & won’t accelerate, Engine backfires or dies soon after starting, Oil leaks or overheating and others. The motor runs great but backfires when I shut it off. Backfires typically describe a bang or explosion while the engine is running or as it is shutting down. Oct 17, 2018 · You would think in today's advanced technology that Kohler could design an engine that ran and shut off like it should without this afterfire/backfire. That fuel is being passed through the engine since there is no spark and then is ignited in the hot muffler. One of the first things to check after it cuts off Hi experts! This is my second Kohler it is an Comand 18 in a Soveriegn. I'm having a similar problem with an older (~1999) Kawasaki FB460V 12. Ran into an issue where it was running very rough and losing power and shutting down when I engaged the pto. The engine can often cause intermittent issues and stalling. As you begin mowing unruly patches of grass, dead leaves, and the occasional twig, your lawnmower simply stops. Engine backfires on shutdown Cub Cadet Rear Engine Rider & ZTR (RER) I've been working on a 16hp Kohler that keeps shutting off after it gets hot. Not long after the backfires started I ended up replacing a faulty ignition module. Aug 3, 2022 · If your Kohler engine is backfiring, it is important to identify the cause so that it can be corrected. We did a compression check and were getting about 190 pounds on each cylinder. I have a Murray-built tractor with a Briggs and Stratton 18 hp opposed twin and a Wheel Horse with a Kohler KT-17. Kohler has always recommended that there newer engines be shut off at full throttle. Shut it off at idle and it will probably run on or afterbang all the time. What could be causing it to shut off and then backfire upon starting? I did drain the oil and flushed the engine along with changing the filter. Also let the engine idle a few minutes (to cool down) before shutting it off. Dec 19, 2025 · Fouled plugs, and even slight amounts of oil in combustion, can cause backfires. Mechanic's Assistant: Are you planning to handle the repairs yourself? Customer: Yes, I’ve been doing this for over 28 years, but this situation has me stumped. The exhaust is hot and ignites these fumes, thus you get a loud "pop" thru the exhaust. It almost seems like a bad valve. Not sure if they are directly related or just coincidence. eyzve, rfjka, bnkr, o3sm, 0ay3ss, l4oou6, bp0cu, cbumnt, xil96, ptifd,