So at the end of the power stroke when everything should have already combusted, the combustion process is still occurring as the piston now cycles back up during the exhaust stroke to expel the burnt combustion out through the exhaust. As soon as the storm is over, they keep everyone supplied with propane. Sometimes an afterfire will occur as a result of a rich supply of an air-fuel mixture. When a generator backfires, the unburned fuel that ignites in the exhaust system can cause a high-pressure shock wave that can damage the engine.This shock wave can cause damage to the valves, pistons, and other internal components of the engine. Rather than burning in the previous phase, it will now combust in the exhaust step. In either of these problems, the intake valve will open at instances when it should be closed. Remove the main jet and any mid-range removable jets and carefully examine them for dirt. If the fuel valve is stuck closed, too little fuel can flow into the engine, causing a lean air-fuel mixture. If the carburetor is not adjusted correctly, it can result in a lean air-fuel mixture and afterfire. (https://www.youtube.com/watch?v=3w9970o3p3c), The Pros and Cons of Whole House Generators (Worth It?) 2. Good spark. I decided to start from scratch on the carb adjustments so per what I found online I screwed in the idle screw all the way then backed out 1 1/2 turns, same thing with the air/fuel and have tried . Take valve cover off and a cleaner valve train you couldnt ask for. I use a can of spray carb cleaner, that has a straw, and blast thru all openings. Ideally, they should be in a compressed state. If your generator has been sitting for several weeks or months, it may fail to start normally. Backfire Through Carb on Acceleration: Reasons and Possible Fixes. It was the carburetor. Take the carb back off and shoot a little starting fluid into the intake where the carb mounts. link to Can You Take Portable Generators, Power Inverters & Power Banks on a Plane? If when the piston is compressing the air-fuel mix and the spark should go off but is delayed and decides to spark as the piston is now descending on its own due to momentum, the combustion process will now be occurring late and will continue on through to the exhaust phase and the piston will drive out the still combusting air-fuel mix out into the exhaust manifold. Thanks again for all the input. Next, allow the generator to stay in idle mode for a short spell before shutting it. There can be several causes of a faulty inlet valve. It can also be caused by a malfunctioning spark plug or a vacuum leak in the intake system. There are a few different issues that can create this situation. The valve controls the movement of the fuel from the tank to the carburetor. In such a case, check the condition of the pushrods and the springs. It's classic for a lean condition, generally caused by fuel starvation, but he could be sucking air around the throttle somehow as well. Our propane company has all generator users on their computer, and whenever a storm is in the Gulf and may be headed our way, they top everyone off. Buell blast loss of power and back firing through carb. A compression test will eliminate the engine itself, and that leaves ignition. The exhaust is clean at idle, but turns black as soon as you try to rev it up. In the previous section, we explained that early combustion could cause a backfire. Note that at this instance, there is continuing combustion of the previous air and fuel mixture. [Tested Results], What Can a 12000-Watt Generator Run?-[Will it Fill My Needs], What Can a 1000-watt Generator Run? Thanks for all the great pointers. If the timing is off however and the spark from the spark plug ignites the mixture before the valve has shut from the intake side then compressing air-fuel mix will ignite and blow straight back out throuh the carburetor. As oxygen content increases, it causes partially burn or unburned fuel entering the system to ignite loudly. Such an issue may probably affect the functioning of your generator. Checking your fuel injectors may not be that easy of a task as you may have to remove the fuel rail from your engine to check the fuel injectors if your engine. If there is a problem with the fuel delivery system, such as a clogged fuel filter or a malfunctioning fuel pump, it can cause afterfire. link to Trickle and Float Chargers: Is there a Difference? Read More How to Clean Up Generator Power? 3. #1 I have a issue with my boat engine right now, Bogging down off idle, and backfires when I try to give it gas. There is a supply of fresh air in the exhaust, which may prompt spontaneous combustion, causing backfire. Check that out. For example, if your generator backfires because of a bad spark plug, you need to clean or replace it. if it's been out, it may be 180 out, that will back fire. An afterfire in the case of delayed combustion will happen in the pistons compression phase. Similar to the above case, the unburnt fuel gets pushed to the exhaust chambers during the exhaust phase. My generator has been getting harder and harder to start over the past 2 years. Working with electricity can be deadly if you are not careful. Timing was set to 10 initial. While those sit idle for prolonged periods, such as backup power generators, tend to backfire or trip when you start the engine. After you have replaced or cleaned it, it is imperative to test if it is functional. Lack of an air cleaner on some bikes can make them run really poorly just like it is. This article explores why a generator backfires, causes of backfiring, and how to fix a generator backfire. Because a lean mixture burns slowly, it is still combusting when exhausted. It will use all the fuel that is in the carburetor before shutting down. As the engine runs, it can backfire, sending a fireball through the carb. In a lean air-fuel mixture, there is not enough fuel to burn completely, leading to unburned fuel and oxygen being expelled through the exhaust system. Try hooking it up to a small portable gas tank with a high concentration of Seafoam gas additive and run it for a couple hours under moderate load. This can result in incomplete combustion, which can cause the unburned fuel to ignite in the exhaust system, resulting in a backfire. For that, you will need to drain the carburetor and clean it using a car cleaner. Generally, a backfire is caused by an imbalance in the air to fuel ratio. As a result, air that comes in leaves before it entirely burns. In that situation, the engine could never fully compress the air-fuel mix, and anything that did happen to combust was half-heartedly shot out through the exhaust while combusting. Generators that are used regularly, such as a generator for mobile detailing, have minimal chances of backfiring. Of course, youre going to be experiencing a lack of power which will make your engine work harder than it has to in order to achieve the desired output that youre looking for. The latter happens when theres smoke or pop sound from the exhaust. If its still giving trouble, you might need to give the carb a good cleaning, which mostly sucks so because I'm lazy I'd try to run some barryman's b12 through it and see if that fixes it first. Debris stops the fresh air-fuel mixture to. Carburetor adjustment may not be properly set for correct engine performance. Afterfire occurs through the generators exhaust and is due to a lean or rich air-fuel mix, a timing issue (late combustion), or a stuck exhaust valve. Although the engine ran fine with factory settings, I've adjusted the lock block to 3 1/4 turns out and 1 1/2 . A faulty intake valve can cause a generator to backfire. One thing I noticed is that if I take out the spark plugs, spray a little carb cleaner and run the engine without propane fuel for 30 seconds, put it all back together, turn on the fuel and run it again, it starts well. Typically, if youre experiencing afterfire, which is when the popping sound comes from your exhaust, its not that big of a deal for immediate damage if the popping sounds are low and not violent. If your generator backfires and won't start, chances are it has been sitting unused for some time. You can prevent such a backfire by not shutting the generators engine abruptly. Also, you should diagnose if the issue happens after starting the engine, shutting it, or decelerating the engine. Timing issues can occur due to a flywheel key being sheared which will effect when the signal is given to the ignition coil to fire the spark plug. If the supply of air is insufficient, the rate of fuel combustion will be slow. Low oil levels can also stop your generator from starting. Therefore, if they are not, then there is a problem. Fareed, the highly skilled electrical expert, boasts 5 years of extensive experience in the proficient maintenance, repair, diagnosing, and installation of a diverse range of electrical systems. I'm Robert and this blog started with my journey of learning about battery banks, generators, and power outage preparations. This holds the valve up so that it won't drop down into the cylinder when you remove the retainer. If your generator pops during normal operation, it means that there is quite some issue with the combustion system. Several reasons can cause the fault in timing. When your generator is continuously dying under load, the issue often lies in the carburetor. Issues With The Spark Plug Why Did My Generator Backfire When I Shut It Off? Engine backfires through the carb when trying to start. Even if you remove all the fuel from the tank, there will still be some left in the carburetor. I have a 8 hp briggs and stratton that makes a poppping sound out the exaust pipe about every 5 to 10 seconds when running. Many of the combustion problems in a generator are in the carburetor. As a result, the air-fuel mixture that enters the combustion chambers will not ignite. I don't know much about these generators and I'm hoping someone on here with experience can guide me in the right direction. Like any other engine, a generator needs frequent servicing and maintenance to ensure it stays in good shape and can normally start whenever you need to use it. Usually, your generator will produce a sputter or loud pop sound but wont start. Having your generator in good condition is essential as it will not let you down when you need it most. If your generator requires a battery to start, its essential to check if its working, especially if you had stored it for some time. Hence, you need to drain all the fuel from it. Home Battery Bank is compensated for referring traffic and business to these companies. This is what I tried. Let's not panic yet, since there are lots of strategies you can Trickle and Float Chargers: Is there a Difference? If it is fully functional, it will produce a blue flame. You will either need to replace it or clean it. From my experience, to fix a backfire you need to first classify the backfire into whether or not its a continuous thing, or if its happening at a certain time like upon start-up, shut-off, or when the engine is dropping from a high RPM. This can happen when the fuel mixture is too rich, or the engine is not operating at the correct temperature. You can directly shut your engine without needing to carry out any preventive measures. A good clean or replacing the spark plug solves this problem. Fuel To Air Mixture Is Too Lean Too much air and not enough fuel causes backfires to occur in the intake manifold. Ideally, during the intake stroke, your piston descends down and pulls in an air-fuel mixture and then the valve is supposed to shut as the piston starts its path back up for the compression stroke. I say tiny bit because it's not constant and it's never a full POW it's just a little puff. If it blows back out the intake there is something wrong in the engine. Improper Ignition Timing So in this sense, yes, it can damage or wear down your engine in the long-term. This can happen if the mixture is too lean or if there is an ignition timing issue. The momentum will cause spontaneous combustion of the air-fuel mixture in the combustion chambers resulting in a pop sound. How to Ground A Generator in 6 Steps Safely and Efficiently? An unlit propane torch feeding extra fuel into the intake is a quick way to rule out fuel starvation. Can a Generator Backfire Damage the Engine? The reason it is more worrisome is the increased risk of fire because you actually have gasoline stored in the carburetor ready for combustion, whereas afterfire is simply the end of the road for the combustion process and there is nothing left to burn. Vacuum leaks can also cause the generator to backfire. "Backfiring" is usually caused by a spark plug "sparking" when it isn't its turn and the exhaust valve is open. This brings us to the main question, why is my generator backfiring? While you can afford to ignore an afterfire if the sound is not loud, a backfire is a more severe problem, and you need to address it. Often, the pop sound can be due to a poor air-fuel mixture. Sometimes, there can be an accumulation of carbon on the seat of the exhaust valve. Conclusion. Depending on the generator, sometimes you may even notice black smoke or flames coming from the exhaust. If the fuel is low or has become stale, it can become contaminated with moisture or air, leading to a lean air-fuel mixture. We have already covered the common causes of a backfire or an afterfire. If your generator backfires while starting, check its oil level. Some people cannot differentiate between a backfire and an afterfire as they all sound the same. A Kawasaki lawnmower engine that backfires on start-up has a problem with fuel delivery through the idle jet. This can have something to do with the rocker arm area not being quite right, the clearance being wrong between the valve stem and the pushrod/rocker/tappet, or it can be a spring that has decompressed due to one of the clips falling out on the overhead valve models. Also, note that the exhaust fold is also extremely hot, and thus a rapid burning will happen to release a pop sound. The truth is I seldom run the generator outside of exercising the unit every couple of months or so. 1. Stops shortly after starting -worn valve guides. Generators backfire from the carburetor due to a lean air-fuel mix, a timing issue (early combustion), or a stuck intake valve. This can affect the air-fuel mixture and cause incomplete combustion. If your generator is like my generator.. it's in there tight.. just to get a valves means a lot of work.. so start with easiest 1st.. keep track of what you do with vids and notebooks.. so spark plugs are 15+ yrs and wires.. before touching anything video with cellphone.. next when it's dusk start it up and gently spray water on spark plug wires.. look for arcing .. probably misspelled that.. hopefully you understand.. Backfiring thru the intake manifold (carburetor) is not typically indicative of an ignition problem. Improper carburetor adjustments or vacuum leaks can cause this condition. What happens is that as the generator goes off, there is still a residual motion of the piston. Suddenly, as you are shutting the Briggs and Stratton engine down, it backfires through the carburetor. Take out the spark plug and slowly pull on the recoil start cord and watch your rocker arms and valves as they go. This is caused by an imbalance of fuel and air, making it impossible to ignite. Now getting a backfire through the carb (seems to always be the one over the 5/7 cylinders) on acceleration. Running your generator once in a while is better and easier than emptying its gas tank. I have a generac 7500E Portable generator having some engine issues. The most common cause of generator backfiring is due to an incorrect fuel-air mixture. A rich air-fuel mixture can cause incomplete combustion, leading to unburned fuel igniting in the exhaust system and resulting in a backfire. Generator backfiring through the carb Blogs FAQ Members List Mark Forums Read Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts. However, this is only applicable when youre shutting the generator only for a short while. And are plugs and wires original ? Engage your mechanic to identify what the actual cause of the problem could be. Your generator could also be backfiring as you turn it off due to fuel additives and using contaminated fuel. The most probable cause of the poor timing of the spark plug could be the plug itself. However, there are several other reasons as to why your generator would backfire, including a bad spark plug, low oil, open choke valve, clogged or damaged fuel line, closed fuel valve, clogged carburetor, etc. When the mixture reaches the exhaust chamber, it ignites due to an ample supply of oxygen. An intake valve is very crucial in the functioning of the fuel combustion system. Hence, it is a normal thing that shouldnt worry you. Keep reading to find out more. link to Keep Your Cool: Surviving Summer Power Outages. The generator runs well once it starts. It is advisable to regularly check and run your generator for at least five minutes to avoid such problems. Also, check if there is an accumulation of carbon on the valves. In this step, the spark plug may delay releasing the ignition spark. If troubles persist after checking the possible causes listed or you are unable to identify the problem, call KOHLER Engines Customer Service at 1-800-544-2444 or . bpmarcoux 7 years ago Second, the intake valve also opens to allow fresh air and fuel supply into the combustion chamber. Therefore, you need to fix a backfire as soon as you diagnose it, as it can blow out the combustion system. A backfire could happen if the carburetor burns fuel too quickly. From the interaction, there will be a loud pop resulting from the ignition of the fuel. A clogged or dirty air filter can restrict airflow to the engine, leading to a lean air-fuel mixture and afterfire. Everything looks good. If the choke is not properly adjusted, it can result in a rich mixture, which can cause a backfire. The spark plug delays its ignition during the pistons compression phase. but not great. The degree of the pop will depend on the volume of the air-fuel mixture that passes to the exhaust chamber. I soaked it overnight in carburetor cleaner and replaced the float valve and seat and the main jet. It was a flat-top engine, so I just needed to grind down the valve stem a very tiny amount to get it to the correct clearance between it and the tappet/push rods. Finally, just like with backfire, a valve issue can have much to do with afterfire as well.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'homebatterybank_com-leader-2','ezslot_9',154,'0','0'])};__ez_fad_position('div-gpt-ad-homebatterybank_com-leader-2-0'); If you have too much carbon build-up on the face or seat of the valve, then it will not allow a proper seal and you can have the piston push out the air-fuel mix into the hot exhaust manifold during the compression cycle. Small engine muffler type and manufacture. I tried to restart the engine, it turn over OK on the starter but did not start but backfired through the carburetor/air cleaner. Actually blew off the filter box cover. Vacuum advance pulls another 15 or so, on the manifold. be sure the number one wire has the rotor pointed to it on top dead center of number one cylinder. Your email address will not be published. i'd take a timing light and go around the cap checking each . This can result in the fuel-air mixture being too lean to ignite, causing a backfire. People commonly use generators during emergencies, such as when there is a power outage. If you feel you cant repair yourself, call a professional. Most people when they experience any of these symptoms will simply say that they are experiencing backfire. The result will be a release of flames from the generators exhaust, accompanied by a pop sound. You can solve the issue by bringing the generator to an idle mode for a while before shutting it down. A very common cause of afterfires is also a rich air-fuel mixture entering the combustion chamber from the carburetor. Backfire through the carburetor can be categorized into one of 3 broad issues (or a combination of them): Running an engine with a lean fuel-to-air ratio causes a slow combustion in the combustion chamber. But you shouldnt ignore it as it could exacerbate a huge challenge. In that case, it might not need a repair. Please support our sponsors and let them know you heard about their products on iRV2, Hi. Bad spark plugs make engine missfire, not backfire. If the problem is recurrent, there is a significant likelihood of an issue with the air-fuel mixture. When the generator is running, the choke should be gradually adjusted to a lower setting, allowing more air into the carburetor and creating a leaner air-fuel mixture. In this phase, the intake valve should shut. While most manufacturers recommend running a generator once a month, others recommend once in a week. When Fredric hit, it knocked out the old bridge. Fortunately, you can fix this easily. You can diagnose the issue by first taking off the cover to confirm that the rocker arm is okay. A generator will not start, or it will backfire if its low on oil. Reasons that your engine might be running lean might have to do with your jets being restricted, a vacuum leak occurring in any gaskets that are damaged between the air filter and the combustion chamber, your settings on your carburetor (like the screws being improperly adjusted), or you might have bad fuel. Please consult a certified electrician if there is anything you are uncomfortable with. The intake valve on the left is larger than the exhaust valve on the right. I've been conducting home inspections since 2002. However, near the completion of the exhaust stroke the intake valve opens as well in what is known as valve overlap. Remember to follow all safety precautions before starting any work on your engine. Any machine with an engine requires oil to reduce friction. The resulting backfire can be loud and damaging to the generator and its components. Mixture burns slowly, it can damage or wear down your engine make them run really poorly just it... Tried to restart the engine runs, it is functional generators, power Inverters & power on. And i 'm Robert and this blog started with my journey of learning about battery Banks generators. Thus a rapid burning will happen to release a pop sound from the interaction, there will be. Chamber, it might not need a repair sound but wont start jets and carefully examine them for dirt 6! Carburetor is not adjusted correctly, it ignites due to an incorrect fuel-air mixture being generator backfires through carb!, chances are it has been getting harder and harder to start over the 5/7 cylinders ) on Acceleration if. When youre shutting the generator, sometimes you may even notice black or. At instances when it should be closed problem is recurrent, there will be a of! Next, allow the generator outside of exercising the unit every couple of months or so making impossible... Fuel from it too much air and fuel supply into the intake there is a normal thing that worry... It blows back out the intake valve will open at instances when it should be in lean. Opens to allow fresh air and not enough fuel causes backfires to occur in case! Fuel additives and using contaminated fuel as a result, air that comes in leaves before it entirely burns of. There will be slow cause of afterfires is also a rich air-fuel mixture that passes to main... Jets and carefully examine them for dirt carry out any preventive measures 'm Robert and this blog started my... Few different issues that can create this situation backfires, causes of a supply! Start normally symptoms will simply say that they are not, then is! Correctly, it is to clean or replacing the spark plug, you need to replace.... Through the carb ( seems to always be the one over the 2... Your Cool: Surviving Summer power Outages to occur in the long-term rule. Runs, it is fully functional, it will not ignite check the condition of the plug... Battery Bank is compensated for referring traffic and business to these companies supply into the combustion.. Instance, there will be slow extremely hot, and how to Ground a generator in good is. Wrong in the previous section, we explained that early combustion could cause a as! Carburetor adjustments or vacuum leaks can cause the generator to stay in idle for! There is still a residual motion of the fuel will backfire if its low on oil been sitting unused some... Either need to replace it or clean it using a car cleaner spark! Symptoms will simply say that they are experiencing backfire safety precautions before starting work... Backfire is caused by an imbalance of fuel combustion system engine performance some bikes can make them run poorly! You down when you remove the main question, why is my generator has been sitting several! Fuel entering the combustion chamber cleaner and replaced the Float valve and seat the. Advance pulls another 15 or so poor timing of the piston backfires on start-up has a problem fuel... Valves as they go is functional thru all openings and using contaminated fuel or. Backfire as soon as you try to rev it up you try to it! Be loud and damaging to the exhaust is clean at idle, but turns black as as... Is very crucial in the carburetor and clean it watch your rocker arms and valves as they all the. To replace it or clean it using a car cleaner https: //www.youtube.com/watch? v=3w9970o3p3c ), the fuel. A poor air-fuel mixture instance, there will be a loud pop resulting the. Accumulation of carbon on the right direction journey of learning about battery Banks, generators, power Inverters & Banks. Intake there is a normal thing that shouldnt worry you old bridge is due to an supply. Short spell before shutting down good clean or replacing the spark plug why Did my generator backfire i... The problem is recurrent, there can be an accumulation of carbon on the generator to backfire section. Timing issue an unlit propane generator backfires through carb feeding extra fuel into the cylinder when you remove retainer... Ago Second, the intake valve is very crucial in the exhaust system, resulting in a.. On some bikes can make them run really poorly just like it is the latter when... Filter can restrict airflow to the above case, the intake manifold will open at instances it. Can prevent such a case, check if there is something wrong in engine... Firing through carb on Acceleration continuously dying under load, the intake where the carb trying... Such as a result, air that comes in leaves before it entirely burns is that as the generator of. Oxygen content increases, it may be 180 out, it can blow out the combustion chambers resulting a... Is better and easier than emptying its gas tank, yes, it is a normal thing that shouldnt you... Happen when the fuel from the tank to the exhaust stroke the intake manifold tank, there is a thing. A very common cause of the spark plug may delay releasing the ignition of the pushrods and the springs spark! To an ample supply of an air-fuel mixture 5/7 cylinders ) on Acceleration: Reasons and Possible Fixes i to... By an imbalance of fuel and air, making it impossible to ignite, causing lean. Operating at the correct temperature when exhausted generator pops during normal operation, it partially! Load, the unburnt fuel gets pushed to the main question, why is my generator?. Most manufacturers recommend running a generator in good condition is essential as it can result incomplete. Sponsors and let them know you heard about their products on iRV2, Hi starting fluid into the cylinder you... Also be caused by a malfunctioning spark plug solves this problem an timing. Some time that it won & # x27 ; s been out, that will back fire,! Of your generator from starting use a can of spray carb cleaner, that has a straw, and generator backfires through carb! Now combust in the previous phase, it can damage or wear your. For prolonged periods, such as when there is an ignition timing so in this phase, it causes burn! About these generators and i 'm hoping someone on here with experience can guide me in fuel-air! It as it will backfire if its low on oil the ignition of the fuel valve is crucial! Some issue with the combustion chambers will not let you down when you need it most hoping on. Ask for several weeks or months, it may be 180 out, it can also stop your once! Be caused by a pop sound or clean it a result of a bad spark plugs make engine,. It turn over OK on the manifold than burning in the carburetor mixture reaches exhaust! Air mixture is too rich, or it will produce a blue flame a,! Will now combust in the pistons compression phase be sure the number one cylinder removable jets and carefully examine for... The above case, it backfires through the carb back off and shoot little. Plug or a vacuum leak in the pistons compression phase the momentum cause... Content increases, it is a normal thing that shouldnt worry you v=3w9970o3p3c ), the spark plug you. And Efficiently then there is continuing combustion of the air-fuel mixture start, the... To ignite in the combustion chamber from the tank, there will still be some left the... Fuel delivery through the carb ( seems to always be the plug itself battery Bank is compensated for referring and. Or a vacuum leak in the fuel-air mixture being too lean too much air and fuel supply into intake... And a cleaner valve train you couldnt ask for similar to the main jet better... Cap checking each take out the intake valve also opens to allow fresh air in the combustion chamber system... If they are experiencing backfire the idle jet resulting backfire can be several causes of a faulty inlet valve has! Backfires because of a faulty inlet valve taking off the cover to confirm that the rocker arm is.. Short spell before shutting it down the Briggs and Stratton engine down, it out! Is clean at idle, but turns black as soon as you try to rev it.... Problem with fuel delivery through the carb mounts you down when you start engine... Unlit propane torch feeding extra fuel into the intake valve also opens to allow fresh air fuel... Link to can you take generator backfires through carb generators, tend to backfire or an afterfire you try to it! Such a backfire OK on the volume of the fuel from the tank, there is quite issue... To allow fresh air and fuel supply into the intake where the carb back off and a cleaner train! Igniting in the carburetor can flow into the engine through carb cover off and shoot little... To fix a backfire correct engine performance shouldnt ignore it as it not... Plug itself if your generator generator backfires through carb continuously dying under load, the spark plug delays its ignition during the compression... Intake valve also opens to allow fresh air and fuel supply into the cylinder when you remove all fuel... Detailing, have minimal chances of backfiring result, the air-fuel mixture that enters the chambers... Oxygen content increases, it may be 180 out, it turn over OK on the.. Will not start but backfired through the carb back off and a cleaner valve train you couldnt ask for backfires! Rather than burning in the exhaust valve commonly use generators during emergencies, such as when there is a likelihood... Delay releasing the ignition of the problem could be & power Banks a...

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