Too much hot or cold engine does not work or even start to produce vacuum pressure inside engine. Disconnect the spark plug from the engine and inspect if it is damaged, eroded, or dirty. "@context":"https://schema.org", However, you still have to confirm the size of the gap before installing. This article will help you fix the most commonly reported problems of a Stihl chainsaw. I thought all the fuel was out but there was some in the line yet. Posted December 27, 2017. #1. 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. 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. They're easy to use and inexpensive, so if you are considering buying one for your home, there are a few quick things you Consumers in the Home and Garden sector turn to us for answers to their nagging questions about various goods and services. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. Your ignition rope must be intact properly with the pulley to work correctly. Ok folks, I'm stumped. Carbon buildup is yet another important factor in the increasing compression experienced by chain saws over time. 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. { Generally covering everything under 25 HP. It was metering lever. "text": "My chainsaw has gotten very hard to pull the rope. I bought it used around 1978. or Best Offer. Always change the spark plug after 100 operating hours of the chainsaw to avoid engine problems. The vibration of the tool during use can run some fasteners loose, preventing it from starting again. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. Sometimes it kicks and the rope pulls right out of my hand. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. It is significantly tougher to pull over than an 024 or the new 241. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. Pull the recoil off and check for binding Pull rope or starter pawls misaligned. Press question mark to learn the rest of the keyboard shortcuts. Normally it's not a problem but if it was already difficult to pull it could be. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. "name": "Egbinor" 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. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull. "interactionType": "https://schema.org/CommentAction", Once it's removed, you can place a gauge on the place of the spark plug. "@type": "Person", 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. Check for clogged shafts and jets, clogged carburetor, damaged valves, stuck levers, and damaged or warped diaphragms, all of which can interfere with the fueling process. Poke the oil feed hole with a 16-gauge wire to unclog it until it slides through the hole smoothly. If it looks physically fine after cleaning it and you havent changed it in a few seasons, you should still replace it. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. 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. I got it started. However, this will vary by model and compression readings alone are not enough to determine the condition of the engine. no, afraid I don't have equipment to test. It uncoils, tightens the spring, engages the clutch to start the engine. 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. If this is the case, you may want to try lubricating the rope to see if it would assist to resolve the difficulties. Im Nelson, a DIY enthusiast with a bottomless can-do attitude. runs way too fast. I think that's what I'd do. My one and only MS250 was a kicker to start it but that was the only problem. Replaced the chain and did some serious cutting and was so pleased. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. So, replacing the ignition rope is a better option to keep everything working smoothly without any damage. Stihl 024 - Sherlock Holmes issue - help needed here. It would give you rusted bearings. Locate the spark plug from the top of the engine underneath the chain brake handle. Consequently, operating this chainsaw becomes a really difficult chore to do. Also, remove the muffler and check for carbon buildup. }. We and our partners use cookies to Store and/or access information on a device. Press question mark to learn the rest of the keyboard shortcuts. } 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. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. 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. That is what was told to me by the area distributor technician That is the nature of a 250. It is like there is too much compression. I've seen a 20psi drop with the wrong type of gauge to be pretty common. Even though it was purchased "brand new" I'm not so sure. A drastic and frankly silly thing to do though . How Much Compression Should a Chainsaw Have. Without proper compression, the engine will not be able to suck and use the fuel for combustion. Follow the steps below on how to fix a flooded chainsaw engine. "userInteractionCount": 23 Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. You have an option to either pull off the starter and clean it or look for an ideal replacement for your starter house. Remove the sprocket and the washer. Currently I live in Austin, United States. Try it, it may just do the trick! The Pulley compartment plays a massive role in retracting the ignition rope. That is what was told to me by the area distributor technician. The switch might be damaged or the motor is burned out. Loosen the nuts holding the clutch cover and disconnect the chain shroud and remove the oil plate. 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. If it is hard to pull, then check how the spring is performing. The other reason might be the use of the wrong type of oil for the climate. If so, show him how to start it on the ground with his foot in it or with the rear handle between his thighs. It is usual for the chainsaw chains to come off with continued use, but there is usually an underlying cause when its too repetitive. When it comes to power tools, good maintenance, and proper use will maintain the functionality and lifespan of the tool regardless of whether it is an electric miter saw or a gas power chainsaw. The exhaust is black but no build up. 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. It is thus highly recommended that you drain the fuel from your chainsaw if it still has any old gasoline left in it. Oct 24, 2011 / Chainsaw excessive compression #1 . Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Recognised as a leading saw in the forestry industry, it is available in guide bar lengths 13"/32cm to 18"/45cm. For a better experience, please enable JavaScript in your browser before proceeding. When this pressure, or compression, is too low or high, the chainsaw . ", Back to top derwen1959 Long Time User If you regularly use the chainsaw, then there might be the possibility that your starter spring breaks off. Usually, this happens when you use a chainsaw after a very long time or by wear and tear of the rope. Would have to remove spark plug and rinse cylinder with gas to be able to start. Carboned rings will decrease not increase compression. 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. I get it going now and its easier but its still a bear. When there is too much fuel, it will not ignite, and the engine wont start. It is, therefore, necessary to determine if the problem has been remedied by adding fresh fuel. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Are you sure the starter rope isn't a little too short? Ron Cook. If it does maybe it is plugged. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. You are using an out of date browser. I hope my epic guides will help you to choose,buy and maintain chainsaw. If you see any unusual movement of spring, then take it in to replace it. 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. Create an account to follow your favorite communities and start taking part in conversations. Does the saw have a compression release? Insufficient fuel in the system may result in excessive compression. If it is not physically damaged, clean it with clean gasoline and a rag. 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. The engine creates a vacuum pressure inside it. Trying to rotate the chain while a huge piece of wood is . Wipe off any dirt and debris and check for any signs of damages. You're familiar with how to start a stihl yes? Would not be afraid to do it to a 4, 6, or V-8. A faulty spark plug will have carbon, dirt, and oil blocking the insulator nose, preventing it from firing consistently. JavaScript is disabled. But it was stolen along with other tools around 1990. I would suspect the timing is too early. Not sure it would accomplish anything on a 2-stroke chain saw engine. When there is no air for the spark to ignite, the chainsaw will start and then die after a short while. Cleaned air filters and both were very dirty. Check for side play in the crankshaft. More information can be found on this page. Disengage the chain brake, turn on the ignition switch and install the new spark plug into the rubber connector. 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. I think that's what I'd do. If it does maybe it is plugged. You never try to get it to run with the choke on. Unscrew the spark plug wrench using a spark plug from 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. Also check the air filters and make sure they are clean. The compression limit should also be doubled if the engine capacity is 100 CC. A compression gauge is used to measure the compression of a chainsaw which works similarly to the tire gauge. What ratio mix is he using? To test the recoil starter, remove it and reposition the spring. Check for broken teeth on the chain and replace them if necessary. Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? 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?? 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 the reading is below or above the required range, then your ignition coil requires changing. Carboned rings will decrease not increase compression. It runs good after I get it started. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. Even with new spark plugs in, incorrectly removing and installing the spark plugs can prevent the engine from starting. Not sure it would accomplish anything on a 2-stroke chain saw engine. }, 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. Cleaned air filters and both were very dirty. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . I agree the saw runs great, but when your helping old men with ideas of their own its hard to say I wish I had 190 pounds of compression. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . I changed to synthitic. Create an account to follow your favorite communities and start taking part in conversations. The owner is complaining of hard to pull start. I tried draining the crankcase with the saw upside . i have a ms 250. 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. Low pressure, 20 to 30 pounds is all you need. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. You can check the compression by pulling the spark plug out and holding it in your hand. Register today and take advantage of membership benefits. Activate the chain brake and then place the chainsaw on a flat, leveled surface. OEM GOOD USED STIHL 048AV CHAINSAW SHORT BLOCK ENGINE 120 PSI COMPRESSION. You are using an out of date browser. }, Pull trigger and set full choke. Make sure the gap is according to the specifications of your chainsaws engine. However, the compression also has a limitation because a very high or very low compression will cause problems and prevent your chainsaw from operating efficiently. This increased distance will cause the chain to keep coming out of the guiding bar with the vibrating saw. Chainsaws are very powerful tools, and if theyre not properly maintained, they can easily overcompress the chain, which can cause it to break. 24" is what I've got on mine, but it can handle a bigger bar. If any of these components are worn or broken, the chain saw wont start even with fuel. 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. I would never put water in it! The starter assembly often fails to rotate due to a weak connection between the pulley and the ignition rope. I;ve read somewhere to put water? I would never put water in it! 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. 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. 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. Friction is usually the cause of a rope failing to draw when it should. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. I wouldn't go messing with the carb expecting to cure the issue unless you have obvious signs of flooding when trying to start. If the compression is too high or too low, the engine wont start. Most times, when the Stihl chainsaw stops working, it is never a complete breakdown. It's also possible the piston or cylinder are scored or carboned up. People sometimes try to cut down a tree that is too big for their chainsaw. Check the tension 2. In most cases, a buildup of carbon under the rings presses the rings against the cylinder, culminating in compression of the cylinder. On a 2 stroke the water would go into the crank case first and pool up. Cleaned it all up, and had it tuned up. 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. If oil is in there it is what makes the engine feel like it is almost locked up. Getting these problems resolved is a rather straightforward process. I have a MS250 that has come up on compression since new. The ignition coil transmits electricity to the spark plug to create a spark that ignites the engine. You may also notice that the chain saw loses power during operation. What are the numbers on your sparkplug? "interactionStatistic": { Subsequent starts are just as hard. My name is Chris Ross. The choke position is the fourth setting on the master control lever. "author": { Don't know what to do at this point. 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. I have a MS250 that has come up on compression since new. Any ideas? Any ideas? 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. Are you sure the starter rope isn't a little too short? I'll even do the labor for free. I've done it to high hour Kohler engines many times. Once you identify the cause of high compression, you can repair that affected part or find a new replacement for it to make it work smoothly. A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. It is possible however to flood a two stroke which can cause the plug to fowl. Does the saw have a compression release? Get you some Sea Foam at the local auto parts store. Press J to jump to the feed. 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. It's supposed to warm up later this week so I'll be able to do some more on this chain saw. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. The key on the flywheel is in place and not sheered. Low pressure, 20 to 30 pounds is all you need. 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. Don't put water into the 2 stroke. A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. The piston and rings are very shiney. Quoting Removed, click Modern View to see What?? Low pressure, 20 to 30 pounds is all you need. The excess gas can be cleared simply by removing the plug and operating the starter a few times. I usual only choke my MS250 for one pull and no longer have the flooding issue. It's also possible the piston or cylinder are scored or carboned up. 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 early 064, 044, 066 came with a red master control. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. Take off the muffler or the carb to get access. of compression. Thanks. It prevents the carburetor from allowing too much fuel into the combustion chamber. Soaking in water will do nothing but rust things up . I bought 2 032 Stihl saws at auction that pulled very hard. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. If the chainsaw still wont start, it is defective and requires a replacement. The plug should be tight against your thumb. Choke cannot be used even when engine cold, or flooding occurs. Hope this helps. Try blowing the crankcase out with air. If you buy another battery, make sure it has the same voltage and amperage as the old battery. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. Also check the air filters and make sure they are clean. A heavy-duty engine gets hot faster and works better than a cold engine. If cleaning does not help release oil onto the bar, the pump may be damaged and require replacing. ", Confirm the spark plug gap, check and adjust with a feeler gauge or gaping tool. This compression converts fuel (any source) into the potential energy in the engine to start it. Stihl oil has been used. I went with a meteor piston/cylinder set. The Stihl chainsaw comes with a sturdy body, strong teeth, and a smooth rotating bar to help you cut through trees, ice, and even concrete with ease and precision. Similarly, a 4-stroke engine needs 2 times more compression than a 2-stroke engine, around 180-210 PSI. I was given (estate) a small McCulloch chain saw and it started and ran great. If the coil is faulty, there will be no spark to start the engine and run the chainsaw. I;ve read somewhere to put water? This may sometimes jam your chainsaws rings, causing it to become inoperable. Other than that, you should also use the correct spark plugs for your chainsaw. When you are doing a cold start, push the choke lever to the warm start when the engine starts to run. To clean it, drain the fuel, spray some carburetor cleaner and loosen the residue with a small brush. It was easier to pull after I cleaned it up, but still tough. If oil is in there it is what makes the engine feel like it is almost locked up. 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 after doing it.You might want to do it with screen removed from muffler. So, in our suggestion, one of the first things to check while feeling high compression is the starter spring. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. I think that's what happened, although I didn't think such a small amount could do it. Does the saw have a compression release? Keep in mind that the stuck ignition rope can also damaged other parts inside the starter assembly. Carboned rings will decrease not increase compression. Replace the fuel filters instead of cleaning them as they are pretty affordable and easy to install too. Pull the rope until it starts. Wear rubber gloves and hold the rubber plug and spark plug about 1-2cm from the metal surface of the engine unit. Another big issue that causes too much high compression is the lack of oil in the starter system. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. To inspect the guide bar, disassemble the chain cover, chain and bar. Repair or replace the damaged part 2. An example of data being processed may be a unique identifier stored in a cookie. Thanks! Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. John Deere and its logos are the registered trademarks of the John Deere Corporation. This is bad practice, and can damage your chainsaw. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. If that doesnt work, try gently tapping on the side of the bulb with a screwdriver or other tool. If the chainsaw is too little compression, it may start easily but will not run smoothly. Quoting Removed, click Modern View to see Don't put water in the saw-ever. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. If it has damaged parts, replace it with a carburetor kit that fits your chainsaw model. "datePublished": "2017-08-17", 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. 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. 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. Turn off the choke by pressing the control lever to activate the fast idle. The owner is complaining of hard to pull start. Every chainsaw needs to have some compression to ensure that it operates well. Sometimes, this might be triggered by another problem that is impacting your system. It is basically the same product as TruFuel (same base synthetic fuel with different synthetic oil) that is sold through Stihl dealers and endorsed for use in all Stihl 2-stroke engines. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. Don't know what to do at this point. This can lead to serious injuries, including cuts and amputations. or Best Offer. Clean any mildly dirty parts and replace all the damaged parts. 3 9 9 comments Best Add a Comment Revolutionary-Act469 2 yr. ago Doesn't pull at all or just hard to pull. Generally the minimum is 110 lbs. Make sure the crank taper is clean and the flywheel taper also. Turn the idle speed clockwise until the saw idles and chain turns, and then make a one-fourth counterclockwise turn.