The book probably says that to keep your engine safe since being too lean causes engine damage while too rich usually just makes the engine shut down. This simple fix will not cost a very high amount, but it will definitely save you and your ATV in the long run. This could mean that there is not enough fuel in the first place, thus, the imbalance would be due to insufficient fuel being supplied through the intake. I picked up a 2004 Raptor 350 for $500. However, too much fuel could indicate a fuel leak, and too little air could indicate a clogged component of your vehicle such as the air filter, exhaust, or beyond. I have a 06 raptor 350 and recently i added a jet kit and a pipe. Common reasons include issues with the fuel/air mixture, carburetor, ignition, or fuel pump. http://www.powersportrider.com/CGI-BIN/ZCATJPG?cat... Go to - Index - K & N - Air Box Lid & Filters Precharger. Recently my grizz has been popping/backfiring back through the carb at low rpms. While you are attempting to fill up your ATV with fuel, you could be supplying a smaller portion than you are assuming you are. It seems to do it worse when its cold. It is better to pay a bit out of pocket for a professional to run a few diagnostics than for you to cause (greater) harm to your vehicle. When this issue begins to take place more frequently, then you should attempt to narrow down the issue through the process of elimination. Similar to driving another automobile, these should be regularly changed. However, keep in mind that when this is causing your ATV to backfire, you will at least know the root cause and be able to move on from there. The connector between the carb and the head had a split in it. Get your answers by asking now. Either you can find these in your ATV’s operational guide, or you can do a quick search to see what is appropriate given the varying terrains, speeds, and your personal use of the throttle (and vehicle). Then, your ATV is at a high risk of backfiring. To function properly, remember that the engine needs to have both the fuel and air at the proper proportion. Common reasons include issues with the fuel/air mixture, carburetor, ignition, or fuel pump. When this occurs, your ATV is not able to properly engage in the way it was designed, and your ATV will backfire quite frequently. Have the carbs balanced and then try 2 1/2 turns on the screws. i know what backfiring is (too much gas, not enough air) i just don't know if it's bad for your motor and what not . First of all I would like to thank you everyone in advance for there help. Meaning that the engine is receiving less fuel than it requires for the air taken in or more than enough. Since then my carb has been sounding like it is backfiring. In this case, having less fuel than air in the mixture will cause the small explosion. An ATV carburetor performs the vital role of mixing air and gasoline (in the right amounts) before getting the mixture into the ATV'S cylinders. While some will have access to shops that can look at and review the mechanical and other issues going on with your ATV, this might not be the same for all. ontario400ex. This, though not noticeable as you might first picture when the term ‘explosion’ is brought up, is still a danger in the long run. Since then my carb has been sounding like it is backfiring. AtvHelper.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. #2 - Every jet is identified by a number and that number relates directly to the size of the opening inside the jet. 3. I figured this out while wiggling the carb and the bike got better. PDA. Timing sounds retarded, but I am not an a TV mech. it only does it when it is idling and at low speed cruising. Have not taken carb apart, did check … read more. This site is designed to be go-to resource for Off-Roading and Motor Sports enthusiasts around the world. How an ATV Clutch Works: Operation and Maintenance. What this really means is that the equilibrium that is needed to cause the vehicle to work properly is off, and you will likely experience the resulting backfiring. Although not commonly used in modern ATV releases,... Hi I’m Rob. This could include a wide array of actions, so pay attention to the vehicle and how it is operating. Here’s a video showing the backfiring issue related to a clogged carb and how to fix it. To adjust the settings of your throttle, you will need to review the particular settings that are recommended for your vehicle. Clean the carb. So bad that when it would backfire through the carb it would kill the engine. Sometimes drilling a few 1" holes in the airbox cover will increase air flow and improve running. As mentioned above, these can become clogged or faulty. Join Yahoo Answers and get 100 points today. Forums. Together with the unburned fuel in the … Check the fuel injectors for proper operation. I pulled the carb and cleaned it out. One reason that your ATV could backfire regularly, especially if your ATV has been sitting in storage for a while, is that the carburetor is clogged. Louie. Determining how to resolve your backfiring issue with your ATV will take the process of elimination. Now that you understand the why turn the screw IN to lean out the mixture a little bit. Along these lines, a faulty engine could mean that there is something wrong like a leak, bend, or break in the components of the engine. Carbs rebuilt because of my mistake.Was doing the very same thing when purchased. Were you recently driving your ATV and noticed a sudden and loud bang or pop, potentially causing you to jolt forward? I rigged the connector with some plastic cement and placed a cut tire patch over it for a test. When this happens, the excess fuel will become ignited by the spark plug- the igniting will just take place outside of where it is supposed to (the combustion chamber). These should always be at least checked every 500 miles or so. In this instance, if your spark plugs are not igniting the fuel inside of the combustion chamber, and instead continue to ignite the fuel in the intake or exhaust, then you will notice your ATV backfiring pretty frequently. there is more fuel and less air. 5 Posts . If you want to look at the mechanics of why your ATV is backfiring, you can understand the general principle that is causing this to occur. Backfiring occurs when one (or more) spark plug in the ATV engine ignites the fuel when it’s out of turn in the chamber, and the exhaust valve on the cylinder is open. No idea what the obstruction is, or was, or if it's supposed to be there. It is likely that this was resulting from your ATV backfiring- something that is relatively common but can still be concerning. The ratio of air to fuel in the mixture gets skewed in favour of fuel i.e. I have a 06 raptor 350 and recently i added a jet kit and a pipe. One reason that this could occur is the weak or low pressure from the fuel pump. This means that they should be blocking out any particles such as dirt and mud that could otherwise clog them up. The better you treat your ATV, the better you can expect it to treat you in terms of a quality experience (and no backfiring). Not all ATVs are set up the same, but here’s an example video showing how to replace an ATV air filter. 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