Remove the sprocket and the washer. 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. The extra effort to pull the saw is probably due to carbon build up on the piston crown and combustion chamber. Make sure you have a replacement spark plug on hand in case the problem recurs in the future. The engine creates a vacuum pressure inside it. A drastic and frankly silly thing to do though . Is the spark plug the correct one for the saw? Try it, it may just do the trick! Can anyone make a suggestion. $99.95. I've done it to high hour Kohler engines many times. Runs well, except it. First, remove the cylinder and piston from the chainsaw. water will not dissolve carbon; it is far too hard to be effected. Finally the fuel will be converted into energy. If the starter spring is keep working correctly, it will retract the ignition rope. "width": 200, I thought all the fuel was out but there was some in the line yet. "description":"Discussion of Chainsaw has too much compression in the Tool Talk forum followed by comments. ", Use recommedend chain oil lubricant. Stihl recommends using 89 octane gasoline without ethanol, and the gas should not contain more than 10% ethanol. The second thing, Read More Stihl Chainsaw Charger Not WorkingContinue, Your email address will not be published. Sometimes it kicks and the rope pulls right out of my hand. Could your gauge be off a little? When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. The chainsaw has grooves all around the outer edge of the guide bar, and the chain has teeth that run within the bar rail to keep the chain in place and moving straight. Then Google decarb . By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. water will not dissolve carbon; it is far too hard to be effected. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Are you sure the starter rope isn't a little too short? Stihl MS 250 Chain Saw: The pull start will barely move the flywheel. I would suspect the timing is too early. Flooding usually happens due to an underlying issue: a bad spark plug, bad gas, or a faulty carburetor. Compression is measured by using a simple screw-in gauge. The consent submitted will only be used for data processing originating from this website. Generally covering everything under 25 HP. Oct 7, 2019 / Minimum compression for a Stihl 2 cycle #3 the actual numbers will vary from one tool to another Getting accurate numbers without special tools is quite difficult because of the small volumes. It would give you rusted bearings. Chainsaws are very powerful tools, and if theyre not properly maintained, they can easily overcompress the chain, which can cause it to break. Don't know what to do at this point. The Stihl chainsaw uses a four-position lever ignition system called the master control lever. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. 1. saw has new carb 2. flywheel has been removed and key inspected. Disconnect the spark plug from the engine and inspect if it is damaged, eroded, or dirty. Wipe off any dirt and debris and check for any signs of damages. Being in the cutting services for more than 10 years, I know a thing or two about chainsaw. I hope my epic guides will help you to choose,buy and maintain chainsaw. I have a MS250 that has come up on compression since new. 3 9 9 comments Best Add a Comment Revolutionary-Act469 2 yr. ago Doesn't pull at all or just hard to pull. If oil is in there it is what makes the engine feel like it is almost locked up. Remove the filter, engine control lever and Stihl carburetor. Help, can't pull start Stihl MS250 chainsaw, too much compression. Would have to remove spark plug and rinse cylinder with gas to be able to start. Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. Make sure the crank taper is clean and the flywheel taper also. Soaking in water will do nothing but rust things up . Its just that its nearly impossible to pull. 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. Hold the tip of the blade and adjust the tension of the chain correctly. I got it going. Sparkplug was correct but I think it was a little flooded. "name": "Egbinor" Press J to jump to the feed. It's an older saw I bought at a garage sale. If it is the right sparkplug and not flooded, I would maybe buy a different saw with easy start. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Convenient, durable and robust with minimum weight, the STIHL MS 260 can come with a number of optional features to make the job even easier. Repair or replace the damaged part 2. Once youve done that, reassemble the chainsaw, which should work properly again. Make sure you have a gauge with a schrader valve right at the tip of the spark plug adapter or you will get a low reading every time. Step 1: Prepare the chainsaw Remove the spark plug from the chainsaw. Youll need to clean the cylinder and piston to fix this thoroughly. Stihl 291 chainsaw too much compression Check the compression of the engine. Carboned rings will decrease not increase compression. No carbon on top or on roof of cylinder. If you suspect a compression issue, seek professional help as compression repairs can be complicated. You are using an out of date browser. It would give you rusted bearings. By checking & repairing/replacing these, you can fix the issue. When this comes to a stop, it will come to a complete stop at a certain number, which is the compression of your chainsaw blade. The switch might be damaged or the motor is burned out. Check for side play in the crankshaft. If it has damaged parts, replace it with a carburetor kit that fits your chainsaw model. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. A compression gauge is used to measure the compression of a chainsaw which works similarly to the tire gauge. 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. "height": 57 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. Don't know what to do at this point. If cleaning does not help release oil onto the bar, the pump may be damaged and require replacing. The power of the motor of an engine is measured in its capacity. Apparently gas would seep int crankcase and over several months of setting gas would evaporate leaving oil behind and first time it was pulled would suck oil into the cylinder. I think you'll like it. An excessive amount of compression in your chainsaws starting rope could also be indicated by the beginning rope failing to draw. 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. We will explain the causes of high compression and how you can quickly fix it to make it run smoothly. The choke should be closed during a cold start to limit the air and increase the fuel in the engine to keep it running while it warms up. I;ve read somewhere to put water? Sometimes an adapter is needed to make a tight fit. 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. Youre familiar with how to start a stihl yes? Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. A lot of variables might contribute to excessive compression while using a chainsaw. If it is flooded that should clear it up. The Pulley compartment plays a massive role in retracting the ignition rope. I'm an arborist by profession & a blogger by passion. When the spark plug is removed, the engine turns Ask an Expert Car Questions Small Engine Troubleshooting JON, Small Engine Technician 2,680 Satisfied Customers Certified Small Engine Technician JON is online now Related Small Engine Questions Thank you for the responses. Pull trigger and set full choke. "@type": "Organization", But it was stolen along with other tools around 1990. Stihl oil has been used. Other than that, you should also use the correct spark plugs for your chainsaw. 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. Carbon buildup is yet another important factor in the increasing compression experienced by chain saws over time. Disengage the chain brake, turn on the ignition switch and install the new spark plug into the rubber connector. ProTip: You can use a small air compressor to blow air through the air filter and get rid of the loose dust before proceeding to clean it further. Hold the saw firmly to the ground and crank the engine about four to six times to bleed out the fuel from the combustion chamber. 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. Register today and take advantage of membership benefits. Several reasons can cause your Stihl chainsaw to bog down when your pull the trigger. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) Quoting Removed, click Modern View to see What?? If you recently refueled your Stihl chainsaw, stale gas can be a reason why it wont start. If any part of a carburetor has issues, the right amount of fuel/air mixture wont pump into the chamber, therefore, preventing the engine from starting. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. 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. Turn the idle speed clockwise until the saw idles and chain turns, and then make a one-fourth counterclockwise turn. A chainsaw with no spark will shut down suddenly or not start at all. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. The starter assembly often fails to rotate due to a weak connection between the pulley and the ignition rope. If you regularly use the chainsaw, then there might be the possibility that your starter spring breaks off. If you see any unusual movement of spring, then take it in to replace it. As a result of using bad fuel or leaving fuel in the chainsaw for a long time, the fuel evaporates and leaves behind a sticky substance that accumulates and clogged the carburetor. Trying to rotate the chain while a huge piece of wood is . It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. It is possible however to flood a two stroke which can cause the plug to fowl. Try blowing the crankcase out with air. NelsGarage.com All Rights Reserved 2021 Theme: Prefer by, Stihl Chainsaw Troubleshooting & How-to Guide. Fine adjust everything and both saws start Normal now. It's also possible the piston or cylinder are scored or carboned up. Does the saw have a compression release? Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. You are misunderstanding WHY water is put into carboned up engines. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. Now it has sat since the last use and I went to start it and it turned over maybe three times and the compression . The other reason might be the use of the wrong type of oil for the climate. This may sometimes jam your chainsaws rings, causing it to become inoperable. You are misunderstanding WHY water is put into carboned up engines. Also take the spark plug out and do the same. Sometimes the spring stops working correctly due to overuse and becomes brittle. Do that to the starter side when you're looking at the starter assy. Starter fluids spray can help in those conditions Before pulling shoulder. A smaller gap will cause a weak spark and poor ignition of the engine, while a wider gap will not bring out any spark. Sometimes, this might be triggered by another problem that is impacting your system. If it looks physically fine after cleaning it and you havent changed it in a few seasons, you should still replace it. Check the spark plug of the chain saw if the engine is not starting at all. Stihl MS192T Chainsaw Fuel Oil Tank Engine Housing Assembly OEM. Don't put water into the 2 stroke. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. Also check the air filters and make sure they are clean. 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. runs way too fast. Any ideas? Replace the fuel filters instead of cleaning them as they are pretty affordable and easy to install too. "publisher": { You are using an out of date browser. 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. 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. Check for broken teeth on the chain and replace them if necessary. I changed to synthitic. Check the saws exterior for loose bolts, nuts, and screws and tighten them with an adjustable wrench or screwdriver. No compression when pulling start rope read more Expert Stihl ms 180 chain saw, new carb, spark plug, compression stihl ms 180 chain saw, new carb, spark plug, compression 110, new gas, still won't start what next, piston is not scored. I would suspect the timing is too early. It is significantly tougher to pull over than an 024 or the new 241. That would have to be some puddle of oil for a MS250 to have a "bar oil leaking in and causing high compression problems" What kind of Stihl oil regular or synthitc, had an 025 years ago that was a real knuckel buster never checked compression but was using regular Stihl oil. "author": { If A two cycle engine gets flooded BADLY, oil can separate from the gas mix, accumulate in the crankcase and creates an hydrostatc lock. The owner is complaining of hard to pull start. Generally the minimum is 110 lbs. Do that to the starter side when you're looking at the starter assy. I just picked up a well used 025 that runs like a champ and has quite a bit of compression, I have not put a gauge on it but it will pull the starting handle out of my hands if I'm not paying attention. Lift the bars nose and tighten the nuts on the sidebar to secure the sidebar and guide bar in place. If the chainsaw is too much compression, it may be difficult to start. If oil is in there it is what makes the engine feel like it is almost locked up. If this does not fix the issue, it may be necessary to replace the whole starting rope system with another one. 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. This Indoor Fly Traps: 5 Things You Didn't Know About Indoor Fly Traps. To avoid flooding the chainsaw when cold starting, turn the control lever to half choke after the fourth pull and then turn the lever again to the open choke position immediately when the engine starts. 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! We describe all the possible issues and also suggest the solutions to fix them too. 1 2 Next J Joe_Power Joined Apr 18, 2013 Messages 651 Location USA - Coast to Coast, Border to Border Jun 2, 2015 #1 I just replaced the cylinder and piston on a stihl 036. Use an adjustable wrench to loosen the two nuts on both sides of the chainsaw. The saw runs and starts great. I wouldn't go messing with the carb expecting to cure the issue unless you have obvious signs of flooding when trying to start. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. Check if the wires are damaged or broken and replace them if necessary. "@type": "ImageObject", The carburetor is a significant part of the chainsaw. Being new carb, wasn't looking that direction educate a non mechanic. It works when cold-starting the engine, when the engine is idle and when the engine is open. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. #3. Soaking in water will do nothing but rust things up . It was metering lever. 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 As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. To ensure correct functioning and to prevent excessive compression, you might have to repair worn-out parts with new ones. My husky 266xp has been that away from newjust pull over slow for 2 or 3 times and then try cranking.. 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?? The other cause of your chainsaws high compression could be the stuck ignition rope. A highly compressed engine will not be able to work smoothly because of the too much pressure on engine and you will find it hard to start the engine. If oil is in there it is what makes the engine feel like it is almost locked up. 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.. Quoting Removed, click Modern View to see Don't put water in the saw-ever. If so, show him how to start it on the ground with his foot in it or with the rear handle between his thighs. I would never put water in it! 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 When the fuel starts to turn stale, it gums up and clogs the carburetor just as it would in an unused lawnmower. Unscrew the spark plug wrench using a spark plug from the engine. If you could start an engine with the choke closed and not turn off the choke on time, you will end up flooding the engine with too much gas. Fine adjust everything and both saws start Normal now. So, If you feel too much compression while pulling a chainsaw, the possible reasons might be as below. Suitable Replacement Stihl MS 250 C Compression Release Parts 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. I;ve read somewhere to put water? 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. Turn the engine to get under the piston and blow the crankcase out. Over time or when using the wrong fuel, the fuel filter becomes too clogged and restricts fuel flow, killing the engine shortly after starting. 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?? "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", everything is harder in a tree, not a conclusive test. That is the nature of a 250. It is thus highly recommended that you drain the fuel from your chainsaw if it still has any old gasoline left in it. An example of data being processed may be a unique identifier stored in a cookie. You can use a ratchet to do the task. Get it ported and it brings it to another level. Make sure the gap is according to the specifications of your chainsaws engine. I used to have a Homelite that would do that if I left gas in it. lol. A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips. If you still have questions regarding high chainsaw compression, you can discuss them in the comments. Why is the Garage Door Opener Light Not Working? When starting the motor when its col, you should engage the choke position to increase fuel intake and reduce air to allow the engine to start. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. 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. of compression. 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. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. I bought 2 032 Stihl saws at auction that pulled very hard. To ensure that enough air reaches the chain saw's engine, remove the air filter and clean or replace it, depending on the manufacturer's instructions. The choke position is the fourth setting on the master control lever. A large engine has a huge capacity in its motor. It runs good after I get it started. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Final step: removing the old spark plug and installing the new one. Create an account to follow your favorite communities and start taking part in conversations. Press question mark to learn the rest of the keyboard shortcuts. I bought it used around 1978. The spark arrestor in a chainsaw traps exhaust products emitted from an internal combustion engine. I have a MS250 that has come up on compression since new. Carboned rings will decrease not increase compression. If you do not replace the starter spring on time, it will cause you to replace the whole starter assembly. A drastic and frankly silly thing to do though . If a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. Thanks! If it does maybe it is plugged. It is typical for the Stihl chainsaw to develop some issues, and when this happens, some basic troubleshooting will help identify the source of the issue and solution to help it run smoothly. As far as compression, you can usually tell by how the saw pulls when starting it. If the issue persists after the addition of new fuel to the tank, there may be a fault with the gas pipelines or the fuel filters. stihl ms290 farm boss; By Ron Cook December 27, 2017 in General Chat. There is no carbon build up and all looks like new. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. 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. Remove ignition coil and muffler. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. If you experience low compression, pull the muffler and check the piston and cylinder for, Read More How Much Compression Should a Chainsaw HaveContinue, The possible reasons can be the battery not being charged, properly connected, or dead. The exhaust side of the piston is a warm gold. "height": 57 Spark plugs that are not functioning properly are another probable cause of excessive compression. That is what was told to me by the area distributor technician That is the nature of a 250. The ignition coil transmits electricity to the spark plug to create a spark that ignites the engine. It had a compression release, and it started and ran well. Make sure it is snug but can also move freely by hand. Once it's removed, you can place a gauge on the place of the spark plug. Replace with a new starter house Problem 2: Damaged pulley system Solution: 1. "text": "My chainsaw has gotten very hard to pull the rope. . None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. or very unlikely but happened to me on an 041 make sure the crank hasn't shifted and started to bind. Advanced arborist chainsaw with a top handle and STIHL M-Tronic technology. As a result, normal compression settings will change based on the kind of chainsaw machine you are using. The key on the flywheel is in place and not sheered. Loosen the nuts and bolts clockwise and then pull out the oil pump gently. or Best Offer. 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. I went with a meteor piston/cylinder set. Blup throttle to bring it down to idle. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. pulls with little resistance, similar to my farm boss. Can also be used with hedge trimmer attachment HS 246. The ignition system is responsible for igniting the fuel and air mixture to produce energy that powers the chainsaw. Required fields are marked *. Getting these problems resolved is a rather straightforward process. To fix this problem, turn off the chain saw and let it sit for about 30 minutes to allow the excess gas to evaporate. If the rails are shallow, you need to replace them.