Can anyone make a suggestion. Remove the sprocket and the washer. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. If your chainsaw doesnt automatically turn it off or you forget, the engine cuts off immediately. 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. 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. It would give you rusted bearings. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. The compression limit should also be doubled if the engine capacity is 100 CC. Would not be afraid to do it to a 4, 6, or V-8. If you do not replace the starter spring on time, it will cause you to replace the whole starter assembly. stihl ms290 farm boss; By Ron Cook December 27, 2017 in General Chat. Replace with a new starter house Problem 2: Damaged pulley system Solution: 1. The spark arrestor in a chainsaw traps exhaust products emitted from an internal combustion engine. Reassemble the chainsaw, refill the fuel tank, crank the engine and check for oil along the bar. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. I have a MS250 that has come up on compression since new. Low pressure, 20 to 30 pounds is all you need. You will notice the compression less. This may sometimes jam your chainsaws rings, causing it to become inoperable. It's possible the timing is off a little but without knowing the make and model of the saw that's just a long shot. If cleaning does not help release oil onto the bar, the pump may be damaged and require replacing. 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. 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 ", It would give you rusted bearings. Final step: removing the old spark plug and installing the new one. Keep in mind that good maintenance and storage will reduce breakdowns and maintain your tools performance throughout its lifetime. Any ideas? Recognised as a leading saw in the forestry industry, it is available in guide bar lengths 13"/32cm to 18"/45cm. Read More Chainsaw Primer Bulb Temporary FixContinue, Pull out your battery from the chainsaw, and press the battery button sustainably for a minimum of 5 seconds before you release it. i have a ms 250. I have a MS250 that has come up on compression since new. 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?? I think that's what happened, although I didn't think such a small amount could do it. The other cause of your chainsaws high compression could be the stuck ignition rope. If the compression is too high or too low, the engine wont start. My first chain saw was an old Homelite EZ with a blue metal case and a 20" bar. A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. When you are doing a cold start, push the choke lever to the warm start when the engine starts to run. Take better care of your chainsaw and perform regular maintenance according to the manufacturers recommendations to prevent any of these problems. }, The exhaust side of the piston is a warm gold. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. STIHL MS 170 Chainsaw (NEW) full pack $295.00 $59.00 shipping Stihl MS170 Chainsaw Motor Fast Free Shipping $75.00 Free shipping or Best Offer Stihl 16 inch bar + Chain for MS170 - MS251 3/8 Pitch .043 Gauge 55 drivers $79.75 $25.45 shipping Only 3 left Stihl MS170 Chainsaw motor OEM Fast/Free Shipping $85.00 Free shipping or Best Offer Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. ", The lack of oil dries the chainsaw assembly, which causes high compression and becomes very difficult for you to handle the chainsaw. Detailed, well-researched, and accurate home and garden information presented in an understandable format is our primary goal. or Best Offer. You will notice the compression less. He checked.it clearly says that in the OP. I would never put water in it! First thing I'd check is the pull start assy. 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! JavaScript is disabled. Register today and take advantage of membership benefits. 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. Fine adjust everything and both saws start Normal now. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. I'm an arborist by profession & a blogger by passion. Wash the dirty filter with a non-abrasive detergent and water. We have explained the most effective way to unflood a chainsaw engine below. If the air filter is too clogged, you should replace it. I bought 2 032 Stihl saws at auction that pulled very hard. 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. Remove the right side cover, bar, and chain. Don't put water into the 2 stroke. A heavy-duty engine gets hot faster and works better than a cold engine. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. If any of these components are worn or broken, the chain saw wont start even with fuel. Disconnect the spark plug from the engine and inspect if it is damaged, eroded, or dirty. Stihl chainsaw compression test Joe_Power Jun 2, 2015 Not open for further replies. 3 9 9 comments Best Add a Comment Revolutionary-Act469 2 yr. ago Doesn't pull at all or just hard to pull. People sometimes try to cut down a tree that is too big for their chainsaw. You are misunderstanding WHY water is put into carboned up engines. I have a MS250 that has come up on compression since new. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. I think that's what I'd do. Make sure the gap is according to the specifications of your chainsaws engine. If it is the right sparkplug and not flooded, I would maybe buy a different saw with easy start. Make sure you have a replacement spark plug on hand in case the problem recurs in the future. It is, therefore, necessary to determine if the problem has been remedied by adding fresh fuel. Move the selector lever up one position immediately or the saw will flood on the very next pull. The power of the motor of an engine is measured in its capacity. 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 think that's what I'd do. 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. 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! I tried draining the crankcase with the saw upside . Cleaned air filters and both were very dirty. The carburetor is a significant part of the chainsaw. My name is Chris Ross. Replaced the chain and did some serious cutting and was so pleased. Refill the chain oil by opening the cap on the chain oil tank, filling up the tank until the level is below the cap threads, and then replace the lid. 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. Stihl 251 chainsaw. I;ve read somewhere to put water? Sometimes an adapter is needed to make a tight fit. Free shipping. Sounds flooded, or maybe wrong sparkplug? There is no idle when I release the trigger. A drastic and frankly silly thing to do though . Getting these problems resolved is a rather straightforward process. $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 Unscrew the spark plug using a ratchet and screw the compression gauge in its place. 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. You never try to get it to run with the choke on. For 503552201 Cylinder Compression Plug Package Include: 3 x Cylinder Plug Cylinder Compression Plug The compression limit should also be doubled if the engine capacity is 100 CC. Make sure it fits snug. What are the numbers on your sparkplug? The saw is about 2 years old, light use. Disengage the chain brake, turn on the ignition switch and install the new spark plug into the rubber connector. 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. Soaking in water will do nothing but rust things up . Cleaned air filters and both were very dirty. Another big issue that causes too much high compression is the lack of oil in the starter system. I;ve read somewhere to put water? Also check the air filters and make sure they are clean. 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. Cleaned it all up, and had it tuned up. 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. It is like there is too much compression. As the chain moves over the bar, it spreads the oil across the moving parts to reduce friction and heat. Would not be afraid to do it to a 4, 6, or V-8. Are you sure the starter rope isn't a little too short? Without proper compression, the engine will not be able to suck and use the fuel for combustion. #1. Follow the steps below on how to fix a flooded chainsaw engine. Also, remove the muffler and check for carbon buildup. Turn the engine to get under the piston and blow the crankcase out. This compression converts fuel (any source) into the potential energy in the engine to start it. Pull the rope until it starts. Runs well, except it. Make sure it's greased and the bushings are good. Try blowing the crankcase out with air. Pull trigger and set full choke. Sparkplug was correct but I think it was a little flooded. Tighten the tension screw with a screwdriver to tighten the chain around the bar. It takes a Bosch WSR6F or NGK BPMR7A. To clean it, drain the fuel, spray some carburetor cleaner and loosen the residue with a small brush. Hope this helps. Youll need to clean the cylinder and piston to fix this thoroughly. Turn the engine to get under the piston and blow the crankcase out. Most times, when the Stihl chainsaw stops working, it is never a complete breakdown. Is the spark plug the correct one for the saw? Use recommedend chain oil lubricant. The chain clutch might be, Read More Cordless Chainsaw Wont StartContinue, The most common reason is simply the wrong battery. A 250 has a fair amount of compression for a smaller saw but not that bad. Once the 250 is running, its fine. To inspect the guide bar, disassemble the chain cover, chain and bar. If it is hard to pull, then check how the spring is performing. I've done it to high hour Kohler engines many times. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Open the spark plug hole facing away from you, remove the wire from the spark plug and disconnect the spark plug using a spark plug wrench. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. Low pressure, 20 to 30 pounds is all you need. All it needs is a few inches missing and it will pull too hard like the compression is too high. Also take the spark plug out and do the same. Turn the engine to get under the piston and blow the crankcase out. If the chainsaw engine dies when you release the throttle, turn the low-speed screw with a screwdriver clockwise until it stops and then turns it counterclockwise once. A flooded engine is when there is too much gas in the combustion chamber, usually due to repeatedly starting the chainsaw using the recoil system without the engine starting. NelsGarage will share the knowledge Ive gathered about different tools and give you tips to accomplish your DIY projects faster. It had a compression release, and it started and ran well. You need to pull the exhaust to check that. pulls with little resistance, similar to my farm boss. 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. Save my name, email, and website in this browser for the next time I comment. Hello. Press question mark to learn the rest of the keyboard shortcuts. How To Fix Chainsaw Battery Charger Blinking Red? We and our partners use cookies to Store and/or access information on a device. We're all about fixing small engines, from carburetor rebuilds, to crankshaft machining. That is what was told to me by the area distributor technician. Stihl MS290 MS390 MS310 Chainsaw Has Oil Tank Engine Housing Assembly OEM/ Bin G . If there is any damage to the pulley at any stage, it will cause High Compression or stiffness during a pull.. Currently I live in Austin, United States. As far as compression, you can usually tell by how the saw pulls when starting it. Don't know what to do at this point. If the starter spring is keep working correctly, it will retract the ignition rope. When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. 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. 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. We will explain the causes of high compression and how you can quickly fix it to make it run smoothly. Use of this Web site constitutes acceptance of our. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. I used to have a Homelite that would do that if I left gas in it. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. When there is too much fuel, it will not ignite, and the engine wont start. Would have to remove spark plug and rinse cylinder with gas to be able to start. Try blowing the crankcase out with air. How Much Compression Should a Chainsaw Have. Not sure it would accomplish anything on a 2-stroke chain saw engine. Fine adjust everything and both saws start Normal now. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. I used to have a Homelite that would do that if I left gas in it. Also check the air filters and make sure they are clean. runs way too fast. 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. Make sure the keyway is lined up correctly and tighten the nut down good and tight. 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. Turn the idle speed clockwise until the saw idles and chain turns, and then make a one-fourth counterclockwise turn. You can also quickly fix this anomaly by ensuring a proper troubleshooting of the pulley compartment to find damages. The first step is to remove the cover that covers the spark plug on your chainsaw. 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. It works when cold-starting the engine, when the engine is idle and when the engine is open. Then Google decarb . It is possible however to flood a two stroke which can cause the plug to fowl. Carbon buildup is yet another important factor in the increasing compression experienced by chain saws over time. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. The chain oil will keep the chain lubricated, keep off dirt and allow smooth movement. I would suspect the timing is too early. All it needs is a few inches missing and it will pull too hard like the compression is too high. If not I'm honestly kinda stumped. This is because each machine is made differently and has various needs. Then Google decarb . The key on the flywheel is in place and not sheered. It will be apparent if it is, but usually a scored saw won't run good, if at all. I bought it used around 1978. You can check the compression by pulling the spark plug out and holding it in your hand. Generally covering everything under 25 HP. Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? I bought 2 032 Stihl saws at auction that pulled very hard. Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. The recoil starter in a chainsaw is a start mechanism that allows you to pull the rope. You are misunderstanding WHY water is put into carboned up engines. It will be apparent if it is, but usually a scored saw won't run good, if at all. "author": { You can prevent the new starter rope from fraying by burning the two ends of the rope. 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. More information can be found on this page. Other Professional Battery-Powered Chainsaws We Recommend: Stihl MSA 220 C-B 36V 16-inch Chainsaw: Solid design and increased power backed by Stihl's dealer network. It very often kicks back and pulls the starter rope back in. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. 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. If it does maybe it is plugged. Friction is usually the cause of a rope failing to draw when it should. Remove the entire carburetor and clean it. what and or where is the metering lever.? Too much hot or cold engine does not work or even start to produce vacuum pressure inside engine. If the chainsaw still wont start, it is defective and requires a replacement. If you regularly use the chainsaw, then there might be the possibility that your starter spring breaks off. "name": "Egbinor" Thanks! The starter assembly often fails to rotate due to a weak connection between the pulley and the ignition rope. in the. Although this is often true, it is not always the case. A large engine has a huge capacity in its motor. 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. I got it started. Sometimes the spring stops working correctly due to overuse and becomes brittle. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. Find the low speed, high speed, and idle speed screws near the carburetor, start the engine and allow it to warm up. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. This increased distance will cause the chain to keep coming out of the guiding bar with the vibrating saw. 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 hook up a drill to the nut on the clutch and start hard starting saws that way . Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. 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. "@type": "InteractionCounter", There might be a small stone or thing that is stuck inside the starter and causes the rope not to retract. Turn off the choke by pressing the control lever to activate the fast idle. That model is extremely easy to flood. If you see any unusual movement of spring, then take it in to replace it. 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. 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. "datePublished": "2017-08-17", 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. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. Ensure the chain fits snugly inside of the bar and the teeth that keep it in place are not worn down too low. You are using an out of date browser. Temperature Of The Engine A heavy-duty engine gets hot faster and works better than a cold engine. Create an account to follow your favorite communities and start taking part in conversations. A lot of variables might contribute to excessive compression while using a chainsaw. 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. I have had the cylinder off. "interactionStatistic": { 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. I'm hearing thats just the nature of the beast. Its just that its nearly impossible to pull. Even though it was purchased "brand new" I'm not so sure. I would never put water in it! That is a high compression saw, pull the rope slowly until you feel resistance then give it a short quick pull. By checking & repairing/replacing these, you can fix the issue. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. You can use a ratchet to do the task. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Remove the filter, engine control lever and Stihl carburetor. 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. Any ideas? { 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. This is because your oil is not rated to get to work at a low temperature. I was given (estate) a small McCulloch chain saw and it started and ran great. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) I've done it to high hour Kohler engines many times. If anything prevents the right amount of fuel into the combustion chamber, the chainsaw wont start. Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when starting. You should also make sure the new gas you use is appropriate for the chainsaw. Youre familiar with how to start a stihl yes? The Stihl 066 chainsaw uses the same type of engine most gasoline-powered yard tools use, a two-cycle combustion engine. 24" is what I've got on mine, but it can handle a bigger bar. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. 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. You can unclog the carburetor if the clog is minor. Cleaned air filters and both were very dirty. Posted December 27, 2017. 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. Blup throttle to bring it down to idle. chain saw compression release mod. "description":"Discussion of Chainsaw has too much compression in the Tool Talk forum followed by comments. 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 This could be understood by reading the further explanation below. Use a can of carb cleaner sprayed into the breather/filter assembly. A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. 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. 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. Other than that, you should also use the correct spark plugs for your chainsaw. If oil is in there it is what makes the engine feel like it is almost locked up. Stihl 024 - Sherlock Holmes issue - help needed here. If oil is in there it is what makes the engine feel like it is almost locked up. I wouldn't go messing with the carb expecting to cure the issue unless you have obvious signs of flooding when trying to start. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. An excessive amount of compression in your chainsaws starting rope could also be indicated by the beginning rope failing to draw. #3. The spark plug is located in the engine and ignites the fuel and air mixture, driving the piston and running the engine. I usual only choke my MS250 for one pull and no longer have the flooding issue. }. Start new topic; Recommended Posts. It's also possible the piston or cylinder are scored or carboned up. or Best Offer. I would suspect the timing is too early. Stihl recommends using 89 octane gasoline without ethanol, and the gas should not contain more than 10% ethanol. The ignition system is responsible for igniting the fuel and air mixture to produce energy that powers the chainsaw. Other than damaged parts, using the choke position to start a warm saw often causes a flooded engine. It was easier to pull after I cleaned it up, but still tough. That is the nature of a 250. The second thing, Read More Stihl Chainsaw Charger Not WorkingContinue, Your email address will not be published. When the motor warms up after about a minute, turn on the choke position. Spark plugs that are not functioning properly are another probable cause of excessive compression. Your ignition rope must be intact properly with the pulley to work correctly. John Deere and its logos are the registered trademarks of the John Deere Corporation. JavaScript is disabled. I would suspect the timing is too early. Check the chainsaws fuel if you have not used the tool for a while. The consent submitted will only be used for data processing originating from this website. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull. Ron Cook. 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.