Also check the air filters and make sure they are clean. So be sure to keep your chainsaw properly maintained and avoid compression problems. You need to pull the exhaust to check that. Have had it into dealer and nothing wrong with it and dealer said that from time to time they see saws come in with nothing wrong with them but have increased compression. My /Sthil 034 is very difficult to start. On a 2 stroke the water would go into the crank case first and pool up. Ivor from uk here and I have a stihl chainsaw and when I am hedge laying or pletching as it is called the saw only runs for 15 or 20 seconds or perhaps 1 minute at the most if there is a big cut to make the spark plug tip builds up with carbon,i use proper 2 stroke oil at a ratio of 25to1 does any pletching or hedge laying go on across the pond?? Also try removing the spark plug and see how pull starter works, just trying to see if it could be binding in the recoil/starter assy or not. Carbon build-up in cylinder & piston, bad needle bearing, overused starter spring, oil in the starter system, old or bad fuel, etc can cause too much compression in Chainsaws. Not sure I would do it to a saw, but the engine is running at rather high rpm when the water is sprayed into the carb air inlet. Remove the filter, engine control lever and Stihl carburetor. I love to write about chainsaw for homeowners and professionals. Drain and discard the old fuel, mix new fuel and cycle oil in the ratio 50:1 in a container, shake it and then pour the mixture into the chainsaws fuel tank. Replace the spark plug with a new identical. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. Spark plugs that are not functioning properly are another probable cause of excessive compression. Sometimes the spring stops working correctly due to overuse and becomes brittle. When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. However, you still have to confirm the size of the gap before installing. If I drop start it I can pull it through 1 compression stroke. I've been working on a Stihl 026 chainsaw that John found, and it is very hard to crank. You will notice the compression less. If the chainsaw is too little compression, it may start easily but will not run smoothly. Guido Quoting Removed, click Modern View to see What?? Back to top derwen1959 Long Time User Make sure it's greased and the bushings are good. You can check the compression by pulling the spark plug out and holding it in your hand. I luv my 064. John Deere and its logos are the registered trademarks of the John Deere Corporation. Have had it into dealer and nothing wrong with it and dealer said that from time to time they see saws come in with nothing wrong with them but have increased compression. In this case fixing or repairing is required or worst replacing the engine all at once. I used to have a Homelite that would do that if I left gas in it. idle. Detailed, well-researched, and accurate home and garden information presented in an understandable format is our primary goal. Loosen the nuts and bolts clockwise and then pull out the oil pump gently. My husky 266xp has been that away from newjust pull over slow for 2 or 3 times and then try cranking.. You are misunderstanding WHY water is put into carboned up engines. "interactionType": "https://schema.org/CommentAction", Now, the gauge might come in a number of size variations, so you need to use an adapter to make a perfect seal between the gauge and the chainsaw. You are misunderstanding WHY water is put into carboned up engines. Some of the contributing reasons include a full tank of oil, carbon buildup on the exhaust system, and malfunctioning spark plugs. To inspect the guide bar, disassemble the chain cover, chain and bar. Even with new spark plugs in, incorrectly removing and installing the spark plugs can prevent the engine from starting. "@type": "Organization", TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. I think that's what I'd do. As a result, normal compression settings will change based on the kind of chainsaw machine you are using. Does the saw have a compression release? I would suspect the timing is too early. Ok folks, I'm stumped. It works when cold-starting the engine, when the engine is idle and when the engine is open. . }, When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. water will not dissolve carbon; it is far too hard to be effected. ", Then Google "decarb". "interactionStatistic": { Loosen the nuts holding the clutch cover and disconnect the chain shroud and remove the oil plate. That is what was told to me by the area distributor technician. A very loose chain will cause the blades to come out of the bar, while a very tight chain is also not ideal for the proper functioning of the chainsaw. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. Also take the spark plug out and do the same. When the engine starts running, turn the choke off. The excess gas can be cleared simply by removing the plug and operating the starter a few times. Other than that, you should also use the correct spark plugs for your chainsaw. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. The chain clutch might be, Read More Cordless Chainsaw Wont StartContinue, The most common reason is simply the wrong battery. All it needs is a few inches missing and it will pull too hard like the compression is too high. Hello EGBinOR, I will also add that if you have points, then the wrong gap will alter the point of ignition and can have the same results, Guido. Stihl 024 - Sherlock Holmes issue - help needed here. First, remove the cylinder and piston from the chainsaw. Start new topic; Recommended Posts. Take off the muffler or the carb to get access. Get you some Sea Foam at the local auto parts store. A drastic and frankly silly thing to do though . Any ideas? Poke the oil feed hole with a 16-gauge wire to unclog it until it slides through the hole smoothly. The ignition coil transmits electricity to the spark plug to create a spark that ignites the engine. Continue with Recommended Cookies. "logo": { Thus far, you have learned how to diagnose most problems with the Stihl chainsaw and how to fix the issues. I get it going now and its easier but its still a bear. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. SPONSORED. If the chainsaw is too much compression, it may be difficult to start. $49.99. When the fuel starts to turn stale, it gums up and clogs the carburetor just as it would in an unused lawnmower. Check for dirty fuel tanks, clogged fuel filters, loose pipes, clogged air filters, and a dirty carburetor, which can all the fuel volume going into the combustion chamber. Pull the rope until it starts. Check the chainsaws fuel if you have not used the tool for a while. It is significantly tougher to pull over than an 024 or the new 241. Stihl oil has been used. #1. anthonyg_ma Original Author 16 years ago Canguy, thnks for the tips! There are sprays (power tune) for removing carbon, but I doubt if that's your problem. I've done it to high hour Kohler engines many times. This Indoor Fly Traps: 5 Things You Didn't Know About Indoor Fly Traps. Press J to jump to the feed. of compression. It is best to put a new plug in after clearing. As the chain moves over the bar, it spreads the oil across the moving parts to reduce friction and heat. The ignition system is responsible for igniting the fuel and air mixture to produce energy that powers the chainsaw. If anything prevents the right amount of fuel into the combustion chamber, the chainsaw wont start. But it was stolen along with other tools around 1990. in the cylinder overnight because the rings are cerboned up? If oil is in there it is what makes the engine feel like it is almost locked up. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. The compression limit should also be doubled if the engine capacity is 100 CC. Obviously, the motor, which has a huge capacity, will require more compression. An engine is fit on the rear side of a chainsaw. You can clean and mildly clogged carburetor but if it is too severe, replace it with one compatible with your chainsaw model. Small Engine Technician #3. It's also possible the piston or cylinder are scored or carboned up. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. I got it going. Its just that its nearly impossible to pull. Finally the fuel will be converted into energy. It prevents the carburetor from allowing too much fuel into the combustion chamber. So, in our suggestion, one of the first things to check while feeling high compression is the starter spring. We are compensated for referring traffic and business to Amazon and other companies linked to on this site. "@type": "ImageObject", This can lead to serious injuries, including cuts and amputations. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Your ignition rope must be intact properly with the pulley to work correctly. stihl ms290 farm boss; By Ron Cook December 27, 2017 in General Chat. It is thus highly recommended that you drain the fuel from your chainsaw if it still has any old gasoline left in it. It is possible however to flood a two stroke which can cause the plug to fowl. If the air filter is too clogged, you should replace it. Cylinder Compression Plug Applicable Model For STIHL 021, 023, 024, 025, 026, 044, 046, 066, MS210, MS230, MS240, MS250, MS260, MS341, MS360, MS440, MS460, MS650, MS660 Chainsaw Parts Refer To Part No. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. Move the selector lever up one position immediately or the saw will flood on the very next pull. Check for clogging around the bar oil. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . The other cause of your chainsaws high compression could be the stuck ignition rope. When the motor warms up after about a minute, turn on the choke position. Chainsaw Parts. Use a brush and cloth to clean and remove any dirt, mud, or debris that can interfere with the controlsclean around the chain brake lever, the air filter housing, and the filter. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Ensure the wires leading to the On/Off switch are not tangled or in contact with the metal part of the engine if there is no spark. For a better experience, please enable JavaScript in your browser before proceeding. To ensure correct functioning and to prevent excessive compression, you might have to repair worn-out parts with new ones. After that, using a ratchet, remove the spark plug from the engine. I changed to synthitic. Try blowing the crankcase out with air. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. Typically, several reasons cause too much compression in a chainsaw and these include but are not limited to: Old contaminated chainsaw fuel Chainsaw Starter rope issues Faulty spark plugs Chainsaw Carbon buildup Insufficient Chainsaw Oil Old and contaminated fuel We describe all the possible issues and also suggest the solutions to fix them too. Carboned rings will decrease not increase compression. If it is over loading on fuel the carb may need rebuilt to stop the diaphragm from leaking fuel into the cylinder after the saw is shut off. I would suggest clearing the cylinder by pulling the rope with the plug out. Make sure it's greased and the bushings are good. "width": 200, I will also add that if you have points, then the wrong gap will alter the point of ignition and can have the same results. Try taking it out, Then holding the trigger while you pull fast. Below are the reasons the chain keeps coming loose and how to fix it. I would never put water in it! Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when starting. That is the nature of a 250. . For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. It was easier to pull after I cleaned it up, but still tough. You can follow the steps on how to troubleshoot and revive it when it wont start. No carbon on top or on roof of cylinder. I used to have a Homelite that would do that if I left gas in it. Make sure the keyway is lined up correctly and tighten the nut down good and tight. An example of data being processed may be a unique identifier stored in a cookie. Fine adjust everything and both saws start Normal now. A 250 has a fair amount of compression for a smaller saw but not that bad. I've got four other Stihl saws here, an 029, 036Pro, 015L, and an MS200T, only the 36Pro pulls this hard and only if I don't use the decomp button. A clogged carburetor wont allow fuel into the engine, preventing it from starting. Another big issue that causes too much high compression is the lack of oil in the starter system. The engine must be up to operating temperature, spray a light stream of water into the engine carb air inlet and the cold water shocks the hot carbon and the carbon flakes off and blows out the exhaust pipe. Help, can't pull start Stihl MS250 chainsaw, too much compression. Quoting Removed, click Modern View to see Don't put water in the saw-ever. If you are trying to start your chainsaw in winter and the oil you used for the chainsaw assembly is not suitable for the winter season, you also feel high compression. The piston and rings are very shiney. Yeah, I must have flooded it as I was working on it. Uninstall the spark arrestor and unblock it using a brush, but you can also replace it for efficiency. Turn the brake off. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. It's an older saw I bought at a garage sale. Turn the engine to get under the piston and blow the crankcase out. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. I'm an arborist by profession & a blogger by passion. We're all about fixing small engines, from carburetor rebuilds, to crankshaft machining. Posted December 27, 2017. I hook up a drill to the nut on the clutch and start hard starting saws that way . Move the selector lever up one position immediately or the saw will flood on the very next pull. It would give you rusted bearings. A hot engine also requires more compression to convert furl into energy as compared to the colder one. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . Make sure it is snug but can also move freely by hand. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. If you recently refueled your Stihl chainsaw, stale gas can be a reason why it wont start. You can prevent the new starter rope from fraying by burning the two ends of the rope. Follow the steps below on how to fix a flooded chainsaw engine. Check for side play in the crankshaft. It runs good after I get it started. It uncoils, tightens the spring, engages the clutch to start the engine. Hello EGBinOR, I will also add that if you have points, then the wrong gap will alter the point of ignition and can have the same results, Guido. lol. "height": 57 If it looks physically fine after cleaning it and you havent changed it in a few seasons, you should still replace it. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. John Deere and its logos are the registered trademarks of the John Deere Corporation. If you regularly use the chainsaw, then there might be the possibility that your starter spring breaks off. I can probably find one with at most 65 PSI. 24" is what I've got on mine, but it can handle a bigger bar. Does the saw have a compression release? I have a MS250 that has come up on compression since new. I hope you understand the problems why your chainsaw is hard to pull. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Stihl MS 250 Chain Saw: The pull start will barely move the flywheel. There is no idle when I release the trigger. Pour starting fluid into the carburetor and crank the engine several times. After all these operations are carried out, it is necessary to once again clean the saw from dirt, then turn it upside down and unscrew the four screws securing the engine to the chainsaw body. $75.00. ", How big a fella are ya? Here is a link for two stroke engine air cycle. MS250 start compression relief stopped working. Ron Cook. "height": 57 For a better experience, please enable JavaScript in your browser before proceeding. Also take the spark plug out and do the same. Can also be used with hedge trimmer attachment HS 246. All it needs is a few inches missing and it will pull too hard like the compression is too high. I would never put water in it! Cleaned air filters and both were very dirty. You need to pull the exhaust to check that. } Every chainsaw requires a specific amount of compression if this compression is more or less than the required amount, the engine will not be able to produce energy from the fuel source, and it will be exhausted faster. In most cases, a buildup of carbon under the rings presses the rings against the cylinder, culminating in compression of the cylinder. $799.99 CHOOSE AN OPTION Deliver From Store e.g., 123 Your Street, Virginia Beach, VA 12345 Add to Cart Order Online - Pick Up In Store Currently Shopping At: JC Licht Ace Hardware-Bridgeport (773) 523-8888 Change My dealer Features STIHL M-Tronic Whether you are a beginner or a professional woodworker, knowing how to fix your chainsaw will save you time and money seeking help from a service center. Starting fluid will make the fuel more combustible and makes the process of clearing out the combustion chamber much quicker. Also try removing the spark plug and see how pull starter works, just trying to see if it could be binding in the recoil/starter assy or not. A chainsaw with no spark will shut down suddenly or not start at all. Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. Would have to remove spark plug and rinse cylinder with gas to be able to start. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. Stihl recommends using 89 octane gasoline without ethanol, and the gas should not contain more than 10% ethanol. Additionally, most spark plugs come pre-gapped. It is like there is too much compression. If you do not replace the starter spring on time, it will cause you to replace the whole starter assembly. "name": "Yesterday's Tractor Co.", How does it feel with the spark plug removed? Have had it into dealer and nothing wrong with it and dealer said that from time to time they see saws come in with nothing wrong with them but have increased compression. Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? High compression in chainsaws is a dangerous problem that can lead to serious injuries. "image": { As the guide bar wears down with use, the bar heel- the part of the bar nearest to the drive sprocket- also wears down, which increases the distance the chain travels as the bar grooves become less effective. I usual only choke my MS250 for one pull and no longer have the flooding issue. How To Fix Chainsaw Battery Charger Blinking Red? If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. It runs good after I get it started. The second thing, Read More Stihl Chainsaw Charger Not WorkingContinue, Your email address will not be published. At this point, the battery will reset,, Read More How To Reset Echo 58-Volt Battery ChargerContinue, The chainsaw battery charger is constantly blinking red, even after charging for a long time!!! If the spark plug is working correctly and you have good fuel, there still has to be enough fuel in the combustion chamber for the engine to start correctly. If repeated cleaning does not fully unclog the carburetor, you will have to replace it. It is harmful to your machine to use old fuel. Turn the idle speed clockwise until the saw idles and chain turns, and then make a one-fourth counterclockwise turn. If it does maybe it is plugged. Check the chain tension and adjust it if it is too loose or tight. But the saw just has a rubber piece on the top shroud with a slotted nut that just fastens it to a stud on the cylinder head, where the valve should be. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. It is usual for the chainsaw chains to come off with continued use, but there is usually an underlying cause when its too repetitive. Guido Hello EGBinOR, If A two cycle engine gets flooded BADLY, oil can separate from the gas mix, accumulate in the crankcase and creates an hydrostatc lock. Wipe off any flammable fluid from the metal surface of the engine with a clean rag. The early 064, 044, 066 came with a red master control. Wipe off the excess fuel from the spark plug with a clean rag. When your Stihl chainsaw doesnt start after changing the spark plug and fuel, some common problems to look for can help diagnose the source of the issue. Make sure you have a replacement spark plug on hand in case the problem recurs in the future. Replace with a new starter house Problem 2: Damaged pulley system Solution: 1. A two-stroke gas-powered chainsaw uses relatively few moving parts. Manage Settings If the starter spring is keep working correctly, it will retract the ignition rope. Ask him if he's drop-starting it. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Do that to the starter side when you're looking at the starter assy. "text": "My chainsaw has gotten very hard to pull the rope. External air goes into the engine through the air filter to cool down the chainsaw engine and also mix with the fuel to ignite and run the saw. Tighten the tension screw with a screwdriver to tighten the chain around the bar. Would have to remove spark plug and rinse cylinder with gas to be able to start. You are using an out of date browser. Over time or when using the wrong fuel, the fuel filter becomes too clogged and restricts fuel flow, killing the engine shortly after starting. The Stihl chainsaw uses a four-position lever ignition system called the master control lever. Currently I live in Austin, United States. That is what was told to me by the area distributor technician, Ivor from uk here and I have a stihl chainsaw and when I am hedge laying or pletching as it is called the saw only runs for 15 or 20 seconds or perhaps 1 minute at the most if there is a big cut to make the spark plug tip builds up with carbon,i use proper 2 stroke oil at a ratio of 25to1. Here is how to troubleshoot a malfunctioning spark plug. Pull trigger and set full choke. I've seen it happen a couple times. Also check the air filters and make sure they are clean. Similarly, a 4-stroke engine needs 2 times more compression than a 2-stroke engine, around 180-210 PSI. Not sure it would accomplish anything on a 2-stroke chain saw engine. If it is not physically damaged, clean it with clean gasoline and a rag. Now it has sat since the last use and I went to start it and it turned over maybe three times and the compression . When the oil pimp or oiler is faulty, it will reduce the chainsaws performance and power. When you start your chainsaw, the crankshaft spins, creating vacuum pressure on the carburetor, pulling the gas from the tank and into the combustion chamber where it mixes with air and ignites. I hook up a drill to the nut on the clutch and start hard starting saws that way . Then Google decarb . It was metering lever. Let saw run until its warmed up, and go cut wood. Im Nelson, a DIY enthusiast with a bottomless can-do attitude. Remove The Chainsaw's Spark Plug Set The Pressure Test Gauge Tug On The Chainsaw's Starter Rope Reset The Chainsaw's Spark Plug Do The Thumb Test Remove The Spark Plug Place Your Thumb Over The Hole Tug On Your Chainsaw's Starter Rope Problems Caused By Too Little Or Too Much Compression Low pressure in a chainsaw High compression in a chainsaw I would suspect the timing is too early. As the starter, spring plays a vital role in running starter assembly smoothly. A large engine has a huge capacity in its motor. I hook up a drill to the nut on the clutch and start hard starting saws that way . If so, show him how to start it on the ground with his foot in it or with the rear handle between his thighs. We have explained the most effective way to unflood a chainsaw engine below. Remove the spark plug with a spark plug wrench and clean it with a brush to remove carbon scoring and dirt. Subsequent starts are just as hard. Typically, several reasons cause too much compression in a chainsaw and these include but are not limited to: Another common cause of chainsaw compression problems is a faulty quantity of old gasoline. I used to have a Homelite that would do that if I left gas in it. Find the low speed, high speed, and idle speed screws near the carburetor, start the engine and allow it to warm up. link to Indoor Fly Traps: 5 Things You Didn't Know About Indoor Fly Traps. Try blowing the crankcase out with air. A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. Wipe off lubricant and grime from the bar with a clean rag. Turn the engine to get under the piston and blow the crankcase out. Stihl chainsaw low compression diagnoses and How To Dave's Small Engines 8.89K subscribers Subscribe 17K views 2 years ago This video shows a Stihl MS310 chainsaw I have apart from low. Don't put water into the 2 stroke. Looks like a saw without base gasket, and too little squish my 250 did the same thing,had to start it with no choke.Take the plug out,crank it the motor and see how much gas spews from the cylinder.Mine would blow out way to much.I had to adjust the metering lever in the carb,no problems after that. Required fields are marked *. "author": { Press question mark to learn the rest of the keyboard shortcuts. Unscrew the spark plug wrench using a spark plug from the engine. Low pressure, 20 to 30 pounds is all you need. Indoor fly traps are an effective way to keep insects away from your home. I bought 2 032 Stihl saws at auction that pulled very hard. Check the chain oiler and ensure it is functional. The saw runs and starts great. I bought an old beater 621 Jonsered once that had very high compression, got it running well and sold it, made some money on it! If you find the brake drum moving, you must replace the needle bearing. Consequently, always use the right oil and make sure that your chain saws starting mechanism is lubricated to prevent excessive compression while starting the saw. Hello. A heavy-duty chainsaw requires a large amount of compression, whereas a chainsaw with a smaller engine needs less compression to convert fuel into energy. The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. By getting your pool ready for the winter, you can make sure it will be ready to use in the spring. If you still want to try and get carbon out of the saw either take it apart and clean it or use something along the lines of sea foam. The consent submitted will only be used for data processing originating from this website. Pull trigger and set full choke. No it wouldn't go straight to crankcase because you would spray a light mist through air intake with hot engine and let it run for a while, (quoted from post at 00:57:42 08/18/17) My chainsaw has gotten very hard to pull the rope. If the chainsaw is too much compression, it may be difficult to start. Don't put water into the 2 stroke.