Tecumseh engine revs up and down This is a late 90's model Scott's lawn tractor with a Kohler engine. There's a slight backfire during the idle surge's decline. The carb was pretty gummed up with old fuel and such like. The screw was stripped on the clamp on the governor so I replaced the clamp on the rod along with a new spring. The engine is quite loud, likely due to the high RPMs, but how would I know the muffler needs changing out? I read that these old tecumseh engines always ran loud (snow king brand?) There was some soot build up around the inside of the carb. Toro 38515 38516 Snow Blower Step 1: You can start by removing the carburetor cover. I attempted to adjust the carburetor's main jet and idle screw out 1 1/2 turns. In many cases, you can troubleshoot and fix the root cause of the issue in your own garage but complicated fixes need a professional … Jul 4, 2025 · A lawn mower revving up and down often stems from engine issues, such as dirty air filters or carburetor problems. Common problems that affect the governor on a Tecumseh engine are that the engine runs either too fast or too slow or that the engine surges or hunts. It sputters and dies, I did clean the carb, replace and adjust a sunk float, replaced a cracked primer line, replaced the fuel We would like to show you a description here but the site won’t allow us. still can’t figure out why pushing up on the lever when it doesn’t move anything but yet the engines slightly revs higher?? Jun 27, 2023 · You will gain an understanding of why the engine on your lawnmower revs up and down, as well as how to fix the issue by going through this article. Any help would be appreciated. Jan 28, 2023 · Why is my lawnmower revs up and down? When your lawnmower revs up and down, the governor gives its best effort to ensure a sustained speed but fails to do it. So what causes the lawnmower engines to surge? Bad gas Bad Tecumseh engines can be a nightmare when they are old. Once it is warmed up and running it starts acting strange. Plenty of videos online for the swap. Thank you! Sep 15, 2023 · What repair is needed on a 5. Engine surging is a common symptom that indicates the need for adjustment or repair of the governor. No warning did not touch anything just happen. Thanks in advance for the help and Happy New Year! HOW-TO Fix A Lawnmower That Revs Too High! This is what I will show you how to fix in this video. The snowblower probably has fewer than 100 hours of use even though Feb 4, 2010 · I have a Tecumseh engine in my snowblower, it has an electronic ignition. What is a Governor? The governor controls the engine speed as loads are applied, such as when engaging blades or going up a hill. It may be cheaper and easier to replace with a Harbor Freight engine for around $200 - $400. Leaking Intake Gasket. Do not have the model number handy but can update this later. Dec 7, 2024 · Are you frustrated with your lawn mower revving up and down? This article explores the common causes behind this erratic behavior, from fuel issues to mechanical faults. Jul 28, 2010 · 2. The snowblower starts fine, when choke is off it revs ridiculously high and will shut down. Where to look for model & spec numbers If you are looking for a Parts Lookup System Check out this link. A build-up of grass, bad springs, poor adjustment, and a damaged governor lever can all lead to high revving. 75 were some very reliable, very tough engines, but they have one common problem that causes them to run and quit, i show how to fix that I own a 3 year old 9. The engine starts right up, then surges and dies. this is not 100% going to work all the time but it dont take much time to check if this quick tips stops your small engine from surging and I investigate why this mower wont rev up when it needs to. Carb is totally clean and rebuilt but I don't believe that was the problem. the thing has no power under load anymore. Fuel line blockages can disrupt smooth operation, causing erratic engine speed. Govenor is incorectly adjusted or not working at all. The exhaust smells very rich. Sep 16, 2007 · The HM80 and HM100 engines are good, they based the Tecumseh STAR karting engine off the HM block, and with Billet parts, it spins over 7K. It's an Ariens Jan 14, 2021 · If your snowblower is surging and backfiring, it’s most like related to carburetor issues, maintenance problems, or broken parts. The engine is a Tecumseh 8. In real good shape except it doesn't keep running. This results in a lean running condition and can be repaired by replacing with a new needle and seat, plus adjusting the float level properly. 773500, which is a big string trimmer on wheels with a Tecumseh engine. After it's been heavily loaded for a few minutes, the engine starts surging like it's running too lean. At this point its running great. I removed the carburetor and cleaned the bowl, needle Dec 16, 2012 · Outdoor Gasoline and Electric Powered Equipment and Small Engines - Toro CCR 2000 snowblower revs hi and low - Hello, I have a CCR 2000 toro snowblower. I prime it a bit and/or use the choke again and it starts right up. I used it a few years back and it was a totally different machine back then. So far I have: Cleaned the carb Completely Replaced the carb Adjusted the idle Replaced the gas Replaced the air filter Replaced the spark plug Replaced the gas with fresh Replaced the fuel line Attempted to adjust the governor per Aug 15, 2008 · I have a Go-Kart with a Tecumseh HM80 Engine. Surging and backfiring in a Tecumseh 8 HP engine often stem from improper carburetor adjustment or dirty fuel passages. e. After sitting a few years, it would start and run, but needed a little TLC to resolve the engine surging and racing up and down. FIX: Remove the air filter. I have read Most engines rev up to around 4,000 to 6,000 RPM, though this can vary significantly depending on what kind of car you drive and how powerful it is. If your air filter is a paper filter, knock the dirt out of the filter by tapping the filter against a solid surface. Dec 2, 2011 · Maybe someone knows something about a very unstable engine run. Discover practical troubleshooting tips, maintenance advice, and step-by-step guides to help you identify and resolve the problem. Now hold what you got and turn the governor shaft in the same direction you rotated the arm. Tecumseh Small Engine Repair: How to Fix & Troubleshoot Fix your Tecumseh Small Engine with expert guides, troubleshooting tips, and step-by-step repair help. to/4411LC9 Carb Cleaner spray: WALMART is around $2 Jan 26, 2021 · The carb to the governor lever was in i believe the wrong hole. 5 horse Tecumseh snow and rev's up an down constantly and will not idle at all except on high Oct 8, 2014 · I have a Tecumseh engine on a Troy Bilt Chipper. How can I repair? Is there a carb adjustment etc. I put a motor on it a few years ago because the old one blew. It has the 120 volt starter. Model 104m020223f1 it starts fine, revs up and then shuts down and dies. This inconsistent fuel supply can lead to fluctuations in engine speed as it struggles to maintain a proper power-to-fuel ratio. Cleaned the Spark Plug 5. 5 hp engine. I can rev it up and idle it down, but after I cut the grass and go to shut it down, I put the throttle into idle Dec 11, 2023 · After viewing this article, mower owners will quickly understand what causes Mower Engine Surging at Idle and how to resolve the problem. I can still blow but to me it sounds like I need more RPM. Learn my quick tip on how to fix a surging generator. The generator is starving for and “hunting” for fuel. If your lawnmower falls into this category, this guide will walk you through the six steps you use to stop lawnmowers from surging. I used it recently and it ran, but It's surging/hunting for an rpm. Learn when to troubleshoot issues yourself and when to seek professional assistance to keep Jan 2, 2022 · Two things most often cause surging on those Tecumseh engines, Most common cause is that the float needle seat has swelled, due to sitting with old fuel, which now is allowing the needle to shut off prematurely. It starts first or second pull and has what I consider normal R. all on its own when simply sitting and idling). The problem im having is it idles funny, it revs up and down, up and down, up and down. 2. Idle 2,200 rpm High 3,900 rpm How are those numbers? Does my machine need adjustment? Here's a pic of the sirometer (vibration tachometer) Dec 1, 2024 · A lawn mower that uncontrollably revs up and down indicates a problem with the engine. Dec 2, 2010 · This Tecumseh 8hp engine is in a Toro 824XL snow thrower, I think the engine is a HMSK80. When I opened the fuel tank, the gas smelled very bad, like turpentine. It always ran perfect and idled good. Understanding these issues will help you diagnose and repair the problem, restoring your lawn mower to its smooth-running state. Ignite your style with our 'Passion-Fueled Engine' graphics! Crafted for the driven soul and coffee aficionado. Throttle control cable doesn't seem to be controlling the engine speed whatsoever. Someone was working on this machine before I got it and I had multiple repairs to correct it. I looked up the service manual and made sure I had all the linkages and governor set It's intolerable! That racing up and down, surging, huntingso frustrating! In this video I'll explain to you the reason a lawn mower surges like that, and I'll demonstrate what can be done to Jan 28, 2011 · I just bought a lawn tractor with a 12. most of the small engines were Briggs and responded well to cleaning. 995502). Dec 10, 2022 · The float itself does not bind when moving it up or down. Stuff I used in the video: BUY A CHEAP NEW CARB $10-25 most engines: https://amzn. May 18, 2015 · However, while I was able to cut the grass, the whole time it ran the engine continued to rev up to cutting speed and drop down to idle. Replaced the Fuel 4. 5 HP Tecumseh OHV XL/C engine. Jan 3, 2022 · When a lawn mower surges, it sounds as if the engine revs up and down. Repair GOVERNOR ADJUSTMENT - Too high RPMs. Knock it back to high and all good. Just not open choke all the way. If your snowblower engine rpm's surge up and down, you'll need to check the springs, carburetors, and more. I believe year 2004, but I would have to check. what could cause this? HOW-TO Fix A Lawnmower That Revs Too High! This is what I will show you how to fix in this video. Ive looked it up and seen that some people remove the governer spring but I dont know if that would Dec 9, 2019 · Hello All Tecumseh HMSK80 155487S The Guy across the Street was snow blowing my driveway for me while I was away on a trip. 38583 R-Tek 141cc It has an over-rev problem. However, while I was able to cut the grass, the whole time it ran the engine FIXING A Snowblower That Surges Does your snowblower engine rev up and down (pulsating) and is that surging driving you crazy? In this video I show you a basic carburetor repair that will cure Snow thrower only runs at fast speed and is over revving, will not Idle. So I removed Jan 29, 2019 · Lawnmower engine surging is a right pain in the Jacksie; it’s an engine that runs erratically and revs up and down by itself uncontrollably. Then, the RPMs start to increase to the point it sounds ready to come apart. I could see the throttle butterfly constantly moving back and forth. Starting is sometimes difficult but sometimes OK. check the easy Oct 23, 2024 · Yes, a bad fuel line can cause a lawn mower to rev up and down. What do I do to fix it. It liked to have the choke one just a bit in Mar 9, 2025 · Is your lawn mower revving up and down unexpectedly? Discover the common causes behind this frustrating issue, from fuel system problems to clogged air filters. Put on new Primer Bulb Jan 12, 2014 · Thought I got some bad gas, so I drained bowl and did not find any water or sediment. Last year it ran great. If i throttle back up to fast the engine stalls again. Stop your Honda engine, Briggs and Stratton engine, Kawasaki, Kohler and any other 4 stroke governed engine from surging. it WILL restsrt back up again. Limited release—grab yours for a bold statement. Push mower. When Feb 10, 2013 · Outdoor Gasoline and Electric Powered Equipment and Small Engines - Tecumseh Snow King snowblower engine surges, even after new carb - I have a 10hp Tecumseh Snow King snow blower engine that surges. It is usually straight up and down where that hex screw is. FIXED! Flywheel removal, OIL SEAL replaced Murray Push Mower with Tecumseh Engine. now the engine revs up and down. im - Answered by a verified Technician A clean air filter should be used in your lawn mower. I don't have the model handy right now. 's when not under load. Jun 12, 2017 · Why is the engine over revving? With the engine running the governor doesn't seem to be controlling the engine rpm's and over-speeding. I replaced the carburetor and still have the same results. Proper adjustment of the governor lever is essential for optimal performance and prevents damage to the engine components. Replaced the carburetor 2. Basically it is a centrifugal speed control were the governor forces the throttle to The sound that a generator makes when it revs up and down is due to inconsistent fuel being delivered to the engine. Mar 17, 2019 · I've got this Craftsman w Tecumseh engine snowblower. Customer: What would cause a Tecumseh 9hp snow blower motor to rev up and down while not under load. If I manually move and hold the linkage it will run in idle but as soon as I let go of the linkage it revs back up. Aug 19, 2018 · I have a Craftsman 536. Toro Power Clear 21" Mdl. So I removed 2. The issue could be a dirty air filter. Now if i close the choke any sooner then 20 minutes it revs up and down, up and down, up and down. Also replaced the crankshaft key. • How to Rebuild a Tecumseh Aug 10, 2025 · Is your Lawn Mower Surging up and down every time you use it? A lawnmower surge is defined as an engine that revs up and down while running, and fortunately, it is something you can fix yourself. Aug 4, 2011 · There is also a video on youtube under the username "donyboy73" and he shows you how to adjust the governor on a Tecumseh engine. Runs for a bit then quits. Nov 17, 2014 · I have a newer 9hp craftsman/tecumseh snowblower (536. I concluded that the problem is that, it burns the prime almost instantly and then dies because it can't suck more gas out of. All of these can seriously impact your snowblower’s performance and prevent it from working correctly. Dec 14, 2019 · I have my dads cub cadet 24in snowblower with a tecumseh engine. It races up and it races down, ad infinitum. turned out I had a BAD ignition switch, but I adjusted valves. I usually set the We would like to show you a description here but the site won’t allow us. Second cause is the idle jet, under the Jan 29, 2019 · They will need to be adjusted depending engine state of tune/condition, engine size, altitude, air temperature, etc If you've got a fully adjustable carb now with main fuel mixture, idle fuel mixture and idle speed adjustability this is the ritual required to get it running right Oct 14, 2022 · The carb is not sending enough fuel to the engine, it is why your snowblower surges up and down. tractors, lawnmowers, snowblowers, chainsaws, weedwackers, generators, tillers, etc. I have to rev it back to idle to prevent the engine from stalling completely. Don't over rev the engine by pushing on the governor arm. A lack of fuel or an insufficient amount of air could cause the problem. The fuel line delivers fuel from the gas tank to the carburetor, and if it’s cracked or leaking, it can cause the engine to run erratically. Our troubleshooting and repair guide can help. Checked Fuel Line, gas tank fuel flowed as expected. Here's what I got. you can remove the choke table first, then you need to remove two Phillips screws and small bolts that hold the cover. Are there any carb adjustments on this or is it just a warn float and needle? Feb 12, 2013 · All kinds of issues after I took the carb off for a rebuild, cleaned the head and top of piston of carbon deposits, etcEverything back together and wants to rev really hi and only runs on full to half choke. The erratic behavior of your lawnmower, sputtering and speeding up, can be a symptom of various underlying issues. 25 and 6. Here is what i see. IT starts great. The engine runs fine for at least 1/2-hour and beyond so long as it isn't too heavily loaded. Pulled plug to clean and re-gap, plug was not fouled badly and gap was as recommended in manual. Governors are essentially designed to slow down the engine if rpms are getting too high. May 19, 2015 · I am working on my mower which has a Tecumseh 640174 engine (model 143. How a Mechanical Governor Works on a 4-Stroke Lawnmower Engine. If it is an older Flat head Tecumseh you need to fix it right away because the engine is in danger of blowing a connecting rod at rpms over 3600. Nov 4, 2013 · I have a 21 HP Kawasaki twin cylinder engine. I put a new carburetor on because of it stalling in the snow. it works. So what causes the lawnmower engines to surge? Bad gas Bad Tecumseh Small Engine Repair: How to Fix & Troubleshoot Fix your Tecumseh Small Engine with expert guides, troubleshooting tips, and step-by-step repair help. I have a 9HP Ariens sno blower, and the motor races up and down in a continuous cycle. Can We Make it Run Again? May 25, 2009 · It is an 8 HP Tecumseh number HM80-1556585 It is not overhead valves and it had the capacitor discharge ignition which I replaced. I can work on Small Engines so tried over the phone to help him - He Aug 13, 2020 · How To Fix A Surging Engine on a Lawn Mower, Generator, Pressure Washer & More! Is your small engine equipment revving up and down, hunting, pulsing and surging? If you want to get rid of this Find the most common problems that can cause a Tecumseh Lawn Mower not to work - and the parts & instructions to fix them. I would have first checked the spring tension, and tunred screws/bent tabs to lower spring tension to get it back down under 4000. A well-maintained carburetor and a properly functioning Sep 16, 2022 · What does it mean when your RPM goes up and down? Before we get into the possible problems behind RPM fluctuations, let’s stop for a moment to deal with the relevance of the revs. Sep 13, 2018 · The engine doesn't run smooth either. A plugged filter doesn’t only cause your engine to shut down, but it can result in your engine overheating causing internal engine damage. There is no choke or manual throttle control on this model of mower. The engine in my Sears snowblower from 1983 is a Tecumseh HM100-159079H that has a breaker point ignition. It will cause increased throttle by introducing additional fuel Mar 13, 2017 · I just tried out my new Briggs + Stratton vibration tachometer, and it's great! Used it on a '94 Tecumseh flathead Snowking engine. I've had it for 8-9 years now. Why Is My Lawnmower Revs Up and Down? American Lawn Mower Company 50514 14" 11-Amp Corded Electric Lawn Mower, Black HOW TO FIX a Honda Lawnmower that REVS up TOO MUCH. Yesterday I Jan 18, 2011 · Hi guys, I'm trying to figure out what's up with this snowblower (Husky Snowking) I just got from a friend of mine. White smoke for the first second or two 3. I can ride it around and mow the lawn, but don't like that it won't start up again sometimes after running, and doesn't run smooth. Feb 27, 2015 · +1 of what Jackmels said. This fourth results in the lawn mower riding rough. Our comprehensive guide offers expert maintenance tips for optimal engine performance, including spark plug inspections and carburetor checks. The lawn mower is a Toro w/ 6. So that you have a better view of the carb parts. a few needed new needle/seat. If the carburetor is clogged or malfunctioning, it may not provide a consistent flow of fuel to the engine. I cleand and lubed the torque converter the other day. Occasionally, it slows down, but then it revs back up again. The Motor start fine but the engine revs to high and with not drop down to idle. Bundle up to save on shipping Nov 17, 2014 · for quite a few years I've been cleaning out carbs on car/truck engines, and a lot of small engines i. After waiting 20 minutes or more i can then close the choke completely and it runs great. I have read Apr 14, 2021 · I'll try to keep this as concise as possible. Perhaps was running way too rich? air leak? (i don't have access to leak down testing) Things I've tried: Dec 3, 2016 · Use compressed air or carburetor cleaner. Problem is now it constantly surges. I did a static set on the Dec 28, 2016 · I agree it sounds like a governor issue or a linkage issue to the governor. There is a stop right there to prevent the throttle shaft from over rotating, but if the throttle shaft gets turned past that stop, it will cause the engine to idle only. Another possibility is that there is something wrong with your ignition system. Why A Tecumseh Engine Was Over-Revving & Repair In this video I show you why a Tecumseh snowblower engine was revving out of control and the repair to resolve the problem. 0 hp Briggs and straiten engine when the engine revs up and down the whole time it is running and the Governor rod is going in and out? Most common culprit in surging We would like to show you a description here but the site won’t allow us. 724cc twin, Model 44T677. Carb was completely torn down, cleaned, ultrasonic too, and reassembled. Feb 19, 2022 · 1981. The machine is about 5 years old and it starts and runs Dec 21, 2017 · I recently picked up a well used chipper with a HM-100 engine. Mar 3, 2025 · The governor is a crucial component in a Tecumseh engine, that ensures consistent engine speed under varying loads. Tecumseh engine. Don't know if a spring should be pulling the linkage Nov 14, 2022 · that governor linkage appears incorrect. Turning off the ignition does not A Tecumseh Lawnmower Engine - leaks oil, no power. What causes a lawn mower to rev up and down? The primary cause of a lawn mower revving up and down is often related to a fuel delivery issue. All of a Sudden the engine started to Over Rev. It often indicates a problem with the engine’s fuel delivery, air intake, or ignition system. If your lawnmower is over-revving make sure to check what I show in this video before taking it to Sep 17, 2005 · I've got a 10 hp tecumseh hm100 horizontal shaft engine on a Sears (american yard products) chipper. . Customer: When idling engine revs up and down a number of times and then stalls. It will start on 1 or 2 pulls and runs fine for 20-40 seconds. It sat for a while before he passed away and as usual the gas dried up and corroded a little in the carb. Engine HUNTING surging REVING pulsating etc FIXED permanently. In some cases, it may only happen under certain conditions, for example, only after the mower gets hot or only when the fuel level gets low. Jan 14, 2009 · Well today I fired the engine up. Dec 5, 2009 · Tecumseh engines are built for use in lawnmowers and snow blowers. Rotate the governor arm so the throttle is in the wide open position. (by Craig Kirkman) I have a Troy-Bilt garden tiller, a Versatiller. This motor is a Tecumseh but the same Sep 17, 2005 · I've got a 10 hp tecumseh hm100 horizontal shaft engine on a Sears (american yard products) chipper. 887992) and the engine revs up and down when I have the throttle in the run position. If you have any questions or comments put them in a bo Does your Mower Rev High?Fix in 3 Easy Steps!In this video, I'll be showing you how to adjust the RPM of your engine by adjusting the governor arm (which in Troubleshooting guide for lawn mower revving issues. 5 techumsa revs up and down at idle, runs smooth under heavy load. May 12, 2025 · How do I adjust the RPM on my Tecumseh engine? RPM adjustments are typically made by turning screws on the carburetor that control the high and low-speed settings. Currently it will only run with the choke fully closed. The engine has been more or less idle for about 2 years. Is your riding mower engine surging mostly UNDER LOAD at MID RANGE THROTTLE / RPM? Check this somewhat hidden and fragile carburetor linkage spring first before digging deeper (ie. The thing cuts out sometimes 10 minutes after starting on the first pull, sometimes longer. Apr 18, 2025 · Why is My Lawn Mower Revving High? (The Short Answer) High RMP stems back to the governor. May 13, 2025 · Overview: A lawn mower revving up and down, also known as “hunting,” can be caused by various factors. runs just Links to Engine Specifications and Line Drawings for Briggs & Stratton, Tecumseh, Robin Subaru, Kohler, Honda & Kawasaki Small Engines. Answered! View the answer I have this problem too Is this a good question? Jul 28, 2010 · 2. This system, often called the governor, is responsible for maintaining a consistent engine speed, even when the load changes. Jul 26, 2021 · If your car revs up and down while driving, you might be wondering why and what you can do it fix it. If it is over-revving, the governor in the engine may be working correctly, but the linkage cannot overcome the throttle spring. This guide will delve into the common causes behind a surging lawn mower engine, explaining why it happens and how you can diagnose and fix the problem trueGot a mastercraft snowblower with an 8. Thanks, Tom of Indy. It sounds like it's about to take off. Free repair advice! Tecumseh engines, especially the LEV series 6. it's a 2 stage 5 hp Tecumseh LH195SA, spec 67419V. Why Is My 10 Horse Tecumseh Snow Blower Engine Revving Extremely High? Mechanic's Assistant chat Customer: I have a 10-horsepower snow blower engine on a wood splitter that was running fine, but then it started to rev extremely high. Learn how to manage a mower that's not revving high enough or revving excessively. Mechanisim on top of carborator? (open and close butterfly valve) twisting back and forth (revs up and down). Nov 11, 2021 · I'm hoping I'll get lucky and someone who is expert on this engine and possible upgrades to it will see this posting. 's. 1. When the blockage moves or clears, the engine may suddenly rev up in response. I have a snowblower, and the engine revs up and down (surges). Common causes of car RPM fluctuation Apr 1, 2024 · A car revving up and down on its own often indicates an engine misfire. After smoke is gone (two seconds at most) i close the choke one click over. After years of use it got to where it would crank and then die immediately. Feb 12, 2014 · Hi, Tecumseh HM80155169E, Starts 1st pull, adjusted all the jets after carb rebuild, but it just seems that under load and full throttle it is revving low. Check and clean the carburetor jets and ensure the idle and high-speed mixture screws are correctly set. fast, slow etc. and yes, that tube is breather from the valve cover. I was told it would not start. When the throttle lever is moved up or down nothing moves and the engine revs the same until the throttle is dropped all the way down then it will idle. The engine has a governor, but I'm not entirely sure how they function. You can hear the RPMs go up and down every second or so. if I give it almost full throttle, the idle speed How to repair an engine carburetor that surges, hunts, pulses or waffles. Dec 14, 2014 · Hi, I'm completely new to the world of forums and this is my question: I have a Craftsman snowblower with a Tecumseh engine, no trouble starting and if I leave the choke on, the motor runs fine idle but as soon as i take the choke off, the motor starts going up and down in revs. Donyboy has a video on that. Sep 23, 2017 · So now when I start the engine on high it actually stays consistent, if I knock the throttle down, it starts to rev up and down again. I can run it for some time at max throttle (not all the way down to choke) with no problems, but suddenly the engine just stalls. Empower yourself to enjoy a smoother, more effective mowing experience by following our expert Apr 11, 2025 · A: When your lawn mower’s engine is revving up and down, it indicates a problem with the engine’s speed control system. Every time I put it away I close the gas valve and run the fuel out of it. Tecumseh stopped making engines around 2009, thus any parts will be 3rd party. ? Also, takes about 20 pumps on the primer to start. Engine is a Tecumseh Enduro OHH50. Mar 7, 2014 · A lawn mower that idles up and down may have an airflow issue. Learn from the DIY experts at Sears Parts Direct on how to fix a surging lawn mower. How to repair and never let it happen again! How to rebuild non adjustable carburetor. 0hp XL/C Xtra Life Industrial/Commercial Engine. Mar 13, 2025 · Mowing the lawn shouldn’t be a frustrating ordeal, but a surging lawn mower engine can quickly turn your chore into a headache. I have repositioned gov. When under a snow throw load, it normalizes, but once you are in a no load situation, it races The engine surges and so in this video I clean the carb. The engine then stalls when the idle Feb 26, 2016 · phayer, if you look down from the top of the carb, see if you can rotate the throttle shaft counter clockwise. It starts up fine but once off choke, it wants to take off and over-rev. It starts fine but revs high and low. Sep 2, 2007 · Hi guys thanks for your help. I shut the machine down, lubed the governor linkages, and noticed that tension from the governor shaft wants to bring the throttle to the WOT position. I haven't done a carb rebuild, but still wondering if my valves could cause this or is it a carb problem?? it runs a minute or so, then stalls. I am mechanically inclined and can read and follow diagrams. Last year, I noticed some fluctuating/sumbling at high rpms. One possibility is that there is something wrong with your engine. 1 year. Tighten the nut and that will do it. This sympton had driven me NUTS on a H60 Tecumseh I have on a Mar 1, 2014 · [/ATTACH][/ATTACH][/ATTACH]I am working on a 5hp Craftsman snowblower with a Tecumseh engine. Nov 17, 2014 · for quite a few years I've been cleaning out carbs on car/truck engines, and a lot of small engines i. It didn't start at all, so I took the carburetor completely apart and replaced the float and was able to get the mower to start. If your lawnmower is over-revving make sure to check what I show in this video before taking it to Aug 29, 2023 · Why Is My RPM Going Up and Down At Idle? There are a few reasons why your RPM might be going up and down at idle. a In this video I show you the throttle linkage configuration and how to set the engine speed on a generator with a Tecumseh flathead engine. Was running and mowing When idling engine revs up and down a number of times and then stalls. When under load it runs much smoother. When choke is on 1/4 or 1/2 it runs fine. I cleaned tank and carb out and it will start right Mar 11, 2010 · Here's a tip for those who might be frustrated by an engine that seems to run great at idle,but either refuses to rev up when the throttle is opened,or sputters and spits and runs erratically if you do happen to coax it above idle. Here, we’ll discuss the reasons why and tell you what you can do if your car starts acting up. It will rev up, then down almost to the point where it completely stops running and dies out. Briggs and Stratton mower engine. It engages the clutch when the rpm is at the highest during idle. my main problem now is ENGINE (tecumseh 13 HP) revs up and down, then stalls. For Opposed Twin engines, Horizontal and Vertical, remove the bowl drain nut and blow air in that hole. Runs for maybe 30 seconds to a minute then does the same thing. I have done the following. If you are adjusting a Tecumseh Jan 29, 2019 · Lawnmower engine surging is a right pain in the Jacksie; it’s an engine that runs erratically and revs up and down by itself uncontrollably. May 20, 2025 · Causes of a Car That Revs Up On Its Own There are several potential reasons for unexpected or unanticipated engine revving, each of which bears consideration when attempting to diagnose an issue of this sort. So I did that Jan 4, 2008 · Jump to page : 1 Now viewing page 1 [50 messages per page] Dec 7, 2018 · I have an older Snowblower with the HMSK80 Engine. It runs OK at full throttle but at idle the engine "hunts" for a constant idle rpm, (the governor is on and off), and the rpm's go up and down. P. Nov 26, 2005 · The engine is on a Snapper 826 snowblower from the mid/late 80's. To staticly adjust the governor, locate the governor arm and loosen the nut on the bottom of the arm. In this video, we'll show you how to fix a surging engine on a lawn mower, pressure washer, or any other small engine. That is a great way to throw a connecting rod right through the side of the block. It may happen at full throttle, when the engine is hot, or at any other time. Mechanisim on top of carborator? (open and close Running, revs going up and down. The engine does not kick down and rev up when I hit a snow drift it bogs down and I loose R. M. It starts fine but won't idle slowly. Assuming that you have a tecumseh engine, I'd add that the starting mixture settings for the Tec carbs are: - Main (bowl): 1 1/2 turns-out-from-seated - Idle Mixture (side of carb): 1 1/4 turns-from-seated - RPM: 3600 & ~ 2100 @ idle If it's running good when a load is applied but still hunts at high-speed / no-load, there's a good chance that the idle circuit is In this video I’m going to explain how to check your carburetor to see why it’s running at full speed. Aspen fuel or,true fuel no ethonal. Mechanic's Assistant chat Customer: I have a tecumseh 5 HP on a Troy Built snowblower. I've never worked on a Tecumseh before so I'll need some help with this one. When at idle, it (revs?) up and down. Not cleaning each part of the lawnmower separately and regularly without removing it may also cause the issue. Understanding the causes of random engine revving is the first step to fixing this otherwise worrisome condition. Still running like crap with engine surging up and down and backfiring. Under no load the engine starts slowing down until it almost stalls, then Jun 6, 2018 · I have a TORO (see year and model details in my profile) that started "surging / hunting" last fall and naturally it's still doing it this spring (= engine runs fast, slow. 4. The issue usually stems from spark plugs that have gone bad or an ignition system failure. Drained fuel, put a new carb and new fuel line on, and it finally runs. Customer: Troy bilt storm tracker 9. 5hp snowblower that hasnt ran in 6 or so years. For all down draft Briggs and Stratton Flo-Jet carburetors (7, 8, 10, 11 HP Horizontal), remove the bowl nut (has adjusting needle in it) and blow compressed air up the nozzle. 3. Luckily for me, it saw very little use from the previous (original) owner and has served me well for the past few years. When the engine starts up it has idle. When I try to reduce the idle, it surges back and forth, backfires, and dies. Your car’s revolutions per minute tell you exactly how many spins your engine makes in a minute. arm either too much revs or just a bit low. Instead of rebuilding the carb, I found you can order a new one (Oregon brand) for about $25 on Amazon. Jan 17, 2019 · I am trying to revive my Manco Dingo. Does the carburetor affect the governor, or does the governor directly I have a Bolens snowblower with a Tecumseh 8 hp engine that I got for free. I bought a new plug, drained the tank and carburetor bowl, put in some fresh gas, and playing with the choke, got it started. If the air that the engine requires to run is blocked, especially sporadically, it can cause the engine to slow down and then rev back up again. Small piece --_____-- shaped kinda like that fell off my tecumseh snow oh195sp. Customer: I have a Tecumseh 8hp MTD 26" snow thrower that idles inconsistently, going up and down, both with and without load.