Atv sputters at half throttle

Atv sputters at half throttle. Runs great until I open it up and it immediately sputters, I stopped went to Idle and it dies, no back fire. I finally got it going but it wont get going that fast and it will start to sputter and do that until I left off the gas. It drives fine half throttle and below. Took it up the road to test it out and made it about 1/4 mile under 80-100% throttle then it starts surging a little and backfiring and trying to die. May 12, 2021 · Here are some possible causes and fixes for a sputtering ATV. Let’s take a look at the probable causes and solutions to a sputtering ATV. Understanding ATV throttles is essential for Jun 13, 2016 · Got the valves adjusted and everything put back together on my Kodiak 400. It also backfires. I was working around the problem of throttle killing the machine by holding the choke closed. There are overlaps for in between settings where it's a little of both working together. Once you go over half throttle it bogs and sputters until you release the throttle. Choke doesn't seem to do anything and thinking perhaps it's stuck closed. I also put a full different engine in the frame and the different engine is acting the same way. . -Throttle ETC is clean / contacts good. Dec 23, 2010 · Of course it had carb problems and the idle speed was way to high and couldn't be lowered. I have a ESR full pipe, velocity air filter, outerwears lid, 172 main, 45 pilot, needle with clip set 5 down from top and air/fuel screw out 2 1/4. The most common reason has to do with a carburetor problem like a tuning issue, vacuum leak, or gas leak. Oct 17, 2012 · #1 - Option 1 New petcock, option 2 mod the stock vacuum one you have to be manual/free flow. Jan 23, 2008 · okay. Kept it about 25% throttle and as long as I'm on flat road it runs fine. It's a 2002 Yamaha Bear Tracker 250. It would also sputter if you tried to open it up past half throttle. Aug 23, 2009 · Totally Apart x 2, throttle cable adjustment, throttle actuator Inside, spark plug, Reverse REV Limiter, checked The Timing x 3, different flywheel, boot for carb to engine) starts and idles fine, just bump the throttle slightly,or try to feather it, it misses and backfires then dies ITS JUST LIKE THE REVERSE REV LIMITER IS STUCK ON. I know this is the idle circuit and I have tried everything from 1 1/2 turns on the mixture screw to 4 turn with no difference. Then suck hard two or three times on the vacuum hose going to the pump, and then let the vacuum off suddenly. if you catch it in time you can grab the clutch and feather the throttle and it will clear back up but if you ever let it cut off it takes a little bit to get it started back up. At about half throttle it sounded healthy but after half it would sputter but not stall. The other day I went to start it up and it idled perfectly so I let it warm up and I gave it some throttle. It smokes quite a bit but it's not "drooling" out of the pipe. I have tried 3 carbs, complete new wiring harness, changed stator. it will start up just fine and if you give it more than half throttle it will spit and sputter and backfire then just die. Jun 12, 2015 · I ran it once for just a few minutes with no airbox and it ran fine, with no sputtering, so I cleaned and checked the air filter, put everything back together and it was still sputtering past half throttle. The throttle of the ATV is what releases the fuel into the engine and thus allows you to accelerate forward. Jul 13, 2023 · Suzuki eiger 400 sputters when givin throttle Jump to Latest 2K views 3 replies 3 participants last post by John1960 Jul 14, 2023 Jan 28, 2024 · Hello, i have a 2003 suzuki ltz 400 and after summer ended I put my quad in storage meaning I drained all the gas and ran the quad until it didn't run. Now it spits and sputters at idle and half throttle. Oct 20, 2013 · Hi I recently picked up a nice 03 Predator 500 for $800 At the time the only issues were it had a rip in the seat, a stripped shifter and the grips were worn out. I swapped to the new zoom carb and had the same issue. It "coughs"and bogs at 1/4 and 1/2 throttle and then picks up revs at full throttle and runs fine at high revs. Sputter problem has remained since then. If the valve fails, the airflow will be off, causing an operating condition that is too rich or lean, which, you guessed it, could lead to engine misfire, amongst other things. I replaced the spark plug today with no improvements. can someone please tell me how to fix this and whats wrong with it thanks. I adjusted this using the small C that raises the needle unit, so they are closer to opening at same time and I can now rev engine in neutral without Nov 7, 2018 · Won't rev very high on full throttle but seems to be smooth at about 1/3 or less throttle. The valve works electronically with the ECU to regulate airflow to the engine. Oct 18, 2010 · Good morning. My 05 Suzuki ltz 400 all of a sudden started sputtering and back fireing at full throttle . You let off the throttle a little and runs good. After I ran some seafoam I can occasionally get it to run full throttle but most times it still sputters. Jan 26, 2015 · Cleared them out and the machine runs perfectly. I've got another Rancher 350 that very occasionally stutters on throttle, and I suspect the same issue. Why? Because the throttle serves as the lifeline of your ATV's performance. Jul 21, 2022 · Next you need to figure out what throttle position you’re at when it’s bogging. If the hose is dangling down you won't see the fuel pumping out properly. Now I have a new seat on it but heres my issue. This time i payed more attention to the symptom, and it feels less like cutting out than a complete bog like if for example i was running along at 1/4 throttle and i turned the choke on that kinda bog but at high speed and throttle position. This could be a simple air screw adjustment, or you may need to change the pilot jet size. It just won't go any faster after half throttle. The fuel screw is only for idle to 1/8 throttle settings, then it's slide needle from 1/8 to 3/4 throttle and main jet from 3/4 to wide open. On half-choke, it runs great throughout the throttle range until it starts to get warm, then it idles a little rough and idles better on NO choke once it starts to warm up (5-10 minutes at 30 F degrees). Feb 26, 2008 · Running with a stuck choke plunger will make for rough idle and a little sputtering at 1/4 to 3/4 throttle, but great at WOT This one I know cuz i ran that way, then adjusted my needles to overcome the rich mid throttle until i found out my choke was stuck on. All other ranges are fine. Ok so I bought a 2000 Quadrunner 500 a couple months ago. I spent a full week trying to figure it out and finally got it There is a little wire that contects to the spark plug coil that came off . When your engine sputters, you can typically detect it immediately. It starts to rev,hits a certain RPM and stops. Particularly, when applying the throttle? Just a 30-second online search would assure you that you’re not the first person to experience this scenario. Throughout the entire rpm range a hollow sound is made. When I went to start it up and go for a ride, the ATV started up and idles fine, but when I give it any throttle it bogs down, sputters and backfires. Jan 31, 2024 · Adjust Throttle Settings. Feb 26, 2022 · Idle good, full throttle good, starts up with a slight bump of the key. Thanks Mar 28, 2010 · It ran fine before,then one day while I was riding it just decelerated and started backfiring and sputtering,I was able to get it home by keeping it low RPM's. If it sputters, chances are it is #1. Sep 15, 2010 · When I get to mid throttle (slide is 1/2 way up) the engine sputters. and a brand new spark plug DCPR8E (stock) at the correct gap. But if you give it throttle little by little and then rev it up fast she bogs a bit but then catches fuel and revs high. You should see a single slug of fuel come out of the fuel hose. It would run but after a bit would sputter and eventually die and would not start again till it was cold. So, identifying where the bog is in the throttle range will help you find the problem fuel Sep 19, 2017 · Anyhow, I've got another project I'm trying to sort out for an older gentleman neighbor of mine. May 11, 2020 · What I mean by this is the quad seems to run perfectly at idle, and will shift into all gears and run and move in all these gears. I could get about 40% power by giving full throttle and holding the choke closed. fule screw 2 turns out and the dyno jet 165 main with a stock 45 pilot. Be sure you 're getting enough fuel, remove your carb fuel feed hose and crank the engine over. Jul 28, 2020 · Hi, did you ever fix your big bear? I am having the same problem. Nov 14, 2014 · I have 2000 350 and it starts fine and idles ok, but it will not rev up. It all started back when my gas cap was not tight and all the gas evaporated. If you can take it to half throttle (in gear and moving), then take it to full throttle. Ran great except for the Harley idle sound. It just started this. Dec 26, 2019 · What would make a 2018 Foreman sputter above half throttle, especially when going up an incline? I have not had time to check it out yet, but my first suspects would be to check the plugs, wires, air filter, and fuel filter. This feature is responsible for increasing or decreasing the fuel entering your ATV’s engine when idle. Put the carb back together and now the idle is good and runs good up to half throttle. If that is not the issue, I will check the valves to ensure proper gap. Check float level. It runs great at low throttle but once you go to about 1/3 throttle it starts to sputter. It does sound like the notorious worn cam shaft issue that many experience though. It can be backfiring, or it might just sound and feel like it’s not using the normal amount of power. Nov 29, 2009 · Quad still won't run from 3/4 to Full throttle. -No air leaks in carb boot. Dec 15, 2019 · I’ve got a 2004 Foreman Rubicon that sputters with the throttle a little above half through full throttle. Nov 20, 2022 · The reason your ATV is sputtering when accelerating could be due to carburetor problems, spark plugs, vacuum tubes, dirty fuel, or other problems. Sputtering Due to Carburetor Problems. Sep 27, 2015 · Both will act normal if you slowly build the throttle up. Posted by u/jesse13579 - 2 votes and 4 comments Jan 13, 2010 · My 01 Bear Tracker 250 cuts out in the mid throttle range on NO choke until engine is hot. When you give it throttle it sputters and will not rev up. 4 wheelers for adults with fuel injectors are an entirely different issue to tackle, and we won’t be discussing them here. But when riding if you get above say 1/2 throttle (doesn't matter which gear), the thing will split/sputter/hurk & jerk. Having some issues with your carburetor is one of the most common reasons why ATVs sputter. Mar 31, 2018 · ( I believe he had the throttle cable adjusted wrong, because it idled fine when I put it back together) So I tore down and cleaned the stock carb, and it started up and idled fine, but needed to have the choke 1/2 out to run. Feb 16, 2011 · A few days ago our 2000 Sportsman 500 started cutting out at about half throttle. It cranks and idles just fine. Mar 23, 2008 · I have a 2007 YFZ450. In neutral, it seems like it doesn't rev up all the way. i have tried to lower clip one at a time and no better i tried raising one at a time no better. Option 3 Yamaha raptor petcock. the only Sep 23, 2019 · -The atv did spend a couple years sitting outside handlebar switches are weathered, front lights intermittently work, i question electrical issues. If I fully clean the carb, install it, it runs good, but the next day, the sputte Oct 4, 2013 · 2011 Sportsman 500 HO Touring: Polaris 3500 lb. Apr 25, 2020 · If you give it fast throttle she bogs and doesn’t rev up. But when I drained the gas out of the tank last time I started it up to get the rest of the fuel out of the lines it ran like a champ. I have a 2006 arctic cat 250. There are many reasons why an ATV sputters. At half throttle, the engine starts missing and sputtering like it is starving for fuel. Is like if at the middle of the throttle she doesn’t get enough fuel for the amount or air but at higher rpms she gets enough fuel and air. HELP. com > > ATV's > General ATV Discussion Apr 3, 2007 - 7 posts - ‎7 authors The engine would only sputter and bog down, kinda like the choke was hung. I put it in gear and when I started to give it a lot of gas it kinda sputtered and wouldn't really go. Cleaned the carb. If it picks up good, it is probably #2. i tried the dyno jet main 165-175. Whether you have a thumb throttle or a twist throttle, you could be operating at a setting that is inappropriately providing too much fuel to your engine while you are sitting still (idling) or while you are in full swing. :help I have a 2006 500 ATV. Feb 21, 2018 · 2002 Polaris Sportsman 500 Backfires above half throttle Jump to Latest 5K views 9 replies 7 participants last post by polman500 Mar 10, 2018 Aug 29, 2017 · After I got the new carb in I adjusted the idle screw and it finally started idling fine. Winch, Kimpex Adventure XL Trunk, 7" Passenger Foot Risers, UNI Foam Filter 2006 Sportsman 500 X2 EFI: Superwinch Terra 25 w/Synthetic Rope, Kolpin 4 gal Gas Pack, 3" Passenger Foot Risers, 3-Headlight Mod, K&N Filter Jul 12, 2010 · 05 lt-z400 stuttering and back fire at full throttle Ok guys I hope this helps . So again, pilot circuit seems like the issue. o half throttle sputter Jump to Latest 2K views 4 replies 3 participants last post by lateburd Nov 1, 2021 We’ve had this ranger for several years and it gets pretty easy but steady usage. Try taking off the air filter and rev the engine to rule out lack of air. -I cleaned the carburetor thoroughly. High or low gear it will sputter at full throttle. once I am past 1/4 throttle It runs fine but I cant get rid of the popping and missing in the 1/4 throttle range. Jul 26, 2015 · My problem is after installing the cam I have a sputter at 1/4 throttle or less. It won't die or bog down, it just isn't moving any faster. The line that comes off the top of carb is for vacuum and if I put my finger over it to seal off it picks up speed and don't sputter, does anyone know what this could mean? Sep 24, 2016 · please help end of my rope here my 2002 polaris magnum 325 4x4 wont rev up??? spits sputters and acts like it has a rev limiter starts fine idles good but wont go after one quarter throttle carb professionally cleaned by local dealer gas tank and all filters cleaned new fuel filter and new fuel pump and new coil and plug all new gas lines and new air filter still wont rev up please any When it comes to All-Terrain Vehicles (ATVs), throttle control is one of the most critical components to master. When you come right on to it it bogs around half throttle then feels like it has no power. May 17, 2020 · Check the spark plug condition and read the color – Check the ATV Plug color guide for what each color means. -Valves are within spec. Why does my ATV engine pop when I give it throttle? This is the beginning of a very detailed question one of our readers asked the ATV AnswerMan. It never stumbles or cuts out on half choke. Any thoughts where to start? Sent from my HD1907 using Tapatalk Oct 8, 2011 · i got a 05 raptor 350. Took her out today and the problem still exists. New at this any help would be appreciated. It cranks nice and easy, idles good, etc. Thanks. For 1/4-1/2 throttle openings when bogging before the powerband, the needle is the most likely culprit. No sputters, chokes, backfires, nothing like that. I replaced the spark plug. It sounds like when I start my Honda without the air filter on. #2 the float bowl screws are a PITA. If it sputters at full throttle no matter what, a good chance the float is to high. Apr 8, 2023 · Lay it on it's side with the hose laying flat. Aug 14, 2010 · the motor idles fine and sounds okay when i hit the throttle but when riding its constanltly breaking up and sputtering it seems like a carb problem but it worked fine before and ive tried every different spot on the mixture screw tried running with half choke with and without airbox lid, everything! can this be elictrical problems? Jan 11, 2015 · Ok I have a 2001 sportsman 500 ho. if they are stripped, try a good pair of vice grips. I’ve replaced the fuel pump, filter, fuel lines, fuel line clamps, fuel tank breather valve, and spark Jan 26, 2015 · Cleared them out and the machine runs perfectly. It has a near identical sound. It just feels like it doesn't have the power at the upper rpm levels. I've rebuilt the top end. No help. The guy said it had set for a while full of gas. I've checked / tried: . May 25, 2017 · The ATV AnswerMan digs into a 2001 Arctic Cat 400. And It occurs at certain RPM's and not throttle position. i have now a dyno jet kit with there needle at the 2nd. Doesn’t matter what gear it’s in, R, N, low, d1 any of them. Starts back up and Idles fine, but once past 1/2 throttle it does the same thing. While ATVs are generally reliable vehicles, they do require some periodical maintenance and repair. I’ve never had problems until recently. Jul 2, 2020 · I did about 4 hrs of studying it and found when the throttle is opened, it opens the throttle butter fly about 1/6 open before it starts raising the needle that allows fuel to flow in high speed. Jul 13, 2014 · Hello, new to the forum. Your ATV’s engine needs air, fuel, and sparks to keep it running correctly. Choke half out bike ran ok. -Air boot / filter are clean and new. Jan 30, 2015 · Check your manual to be sure. When there’s a problem with the equilibrium between air and fuel, the first thing you need to do is adjust your ATV’s throttle setting using its throttle wheeler (fuel mixture screw). Other sputtering issues can be caused by an ignition issue. Oct 31, 2021 · 2003 sportsman 500 h. At higher rpms it sputters like it is hitting the rev limiter only you are not even close to it. It could signal a minor or even more serious engine, fuel, or exhaust system problem. It keeps bogging out anywhere above half throttle almost acting like a rev limiter. May 28, 2010 · I have a 08 650 that spits and crackles and runs rough in reverse at half throttle and even if I rev it up in nuetral. How To Diagnose Throttle Bog. Dec 6, 2020 · Had problem with float vavle letting gas in crank case. Jun 3, 2014 · After it's warm it idles fine and will restart without throttle. It starts to do better again at higher throttle. Jun 6, 2016 · With this setup the bike starts without choke so it should be rich in the pilot circuit. May 2, 2015 · I have a Suzuki Vinson 500 and have seen a lot of post on here about carb troubles, my just sputters when u go part half throttle and bad up hill when u get on it. arcticchat. com www. And by run I mean it sounds great. At 0-1/4 throttle openings, it’s most likely the pilot jet circuit. Does anyone know what is causing this. If I turn off the fuel and let it run for a minute It will rev like normal under full throttle until it stalls out from no fuel but as soon as I open the fuel line again it goes Oct 3, 2017 · If your bogging is at less than full throttle, then it's slide needle and slide needle jet. Apr 6, 2023 · An ATV that is sputtering is not attaining complete combustion. Your carburetor has a few different circuits that come into play at various stages of the throttle application. I can put it 1/4 throttle,1/2 throttle,full throttle and it does the dame thing. I haven't ridden it in a few months. The throttle dictates how fast you go, how well you navigate steep terrains, and even influences your fuel efficiency. The IAC valve is located on the throttle body of fuel-injected ATVs. I tore it apart and soaked over night and cleaned it good. Then time for test ride and everting ran smooth with normal power from start. I didn't remember the fan running, so I checked the fan fuse, but it was of the windings and cause a Dec 30, 2019 · Starts and idles fine, but after about half throttle it sometimes sputters, but really just won't take off like it used to. It's spit and sputtering when you hit the throttle. Jul 17, 2012 · '03 400 backfiring/bogging under throttle - ArcticChat. Changed the petcock, cable, and bought a new carburetor and replaced it. i tried the same system with the stock needle no better. Thanks for any help. gqy hrijg owc ncetm gsjst almytms drlbl pseak vxkpvex lgqqd