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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. It's supposed to warm up later this week so I'll be able to do some more on this chain saw. check the cylinder & piston for carbon build-up, how much compression Does the chainsaw Engine need, How To Reset Echo 58-Volt Battery Charger. When there is too much fuel, it will not ignite, and the engine wont start. So, replacing the ignition rope is a better option to keep everything working smoothly without any damage. It's an older saw I bought at a garage sale. This compression converts fuel (any source) into the potential energy in the engine to start it. How does it feel with the spark plug removed? $20.00 shipping. If this is the case, you may want to try lubricating the rope to see if it would assist to resolve the difficulties. Remove the spark plug with a spark plug wrench and clean it with a brush to remove carbon scoring and dirt. A cold engine will need the compression of 50-100 PSI whereas a hot engine will require compression above 150 PSI. This increased distance will cause the chain to keep coming out of the guiding bar with the vibrating saw. Has someone invented a new kind of two stroke motor? The second thing, Read More Stihl Chainsaw Charger Not WorkingContinue, Your email address will not be published. The excess gas can be cleared simply by removing the plug and operating the starter a few times. Remove the entire carburetor and clean it. When you are doing a cold start, push the choke lever to the warm start when the engine starts to run. The plug should be tight against your thumb. I used to have a Homelite that would do that if I left gas in it. 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. Is the spark plug the correct one for the saw? "@type": "ImageObject", Remove the right side cover, bar, and chain. A 250 has a fair amount of compression for a smaller saw but not that bad. The choke position is the fourth setting on the master control lever. I'm hearing thats just the nature of the beast. 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. How Much Compression Should a Chainsaw Have. This site is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. 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. Here is a link for two stroke engine air cycle. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Detailed, well-researched, and accurate home and garden information presented in an understandable format is our primary goal. If the starter spring is keep working correctly, it will retract the ignition rope. You can unclog the carburetor if the clog is minor. Just wondering what your opinions are of the lowest compression you can run a Stihl MS250 at. Get you some Sea Foam at the local auto parts store. It does not take much to increase the compression. 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 your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. Make sure it's greased and the bushings are good. He checked.it clearly says that in the OP. Repair or replace the damaged part 2. When there is no air for the spark to ignite, the chainsaw will start and then die after a short while. chain saw compression release mod. For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. #3. Now it has sat since the last use and I went to start it and it turned over maybe three times and the compression . Register today and take advantage of membership benefits. Fine adjust everything and both saws start Normal now. Of all the Stihl saws, the MS250 is the toughest to start in relation to it's size. We and our partners use cookies to Store and/or access information on a device. The carburetors work in a chainsaw engine allows the right amount of fuel and air mixture into the combustion chamber. As the starter, spring plays a vital role in running starter assembly smoothly. That is the nature of a 250. Any ideas? Cleaned air filters and both were very dirty. "publisher": { Turn the brake off. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Not sure it would accomplish anything on a 2-stroke chain saw engine. Low pressure, 20 to 30 pounds is all you need. Save my name, email, and website in this browser for the next time I comment. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. By checking & repairing/replacing these, you can fix the issue. If oil is in there it is what makes the engine feel like it is almost locked up. It will be apparent if it is, but usually a scored saw won't run good, if at all. in the cylinder overnight because the rings are cerboned up? I've done it to high hour Kohler engines many times. If the compression is not produced in the engine at an appropriate level, it will not be able to convert fuel into energy. 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. I usual only choke my MS250 for one pull and no longer have the flooding issue. 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. }, An example of data being processed may be a unique identifier stored in a cookie. Ask him if he's drop-starting it. Its just that its nearly impossible to pull. I would suspect the timing is too early. Additionally, most spark plugs come pre-gapped. Replace the fuel filters instead of cleaning them as they are pretty affordable and easy to install too. It uncoils, tightens the spring, engages the clutch to start the engine. If your chainsaw doesnt automatically turn it off or you forget, the engine cuts off immediately. A hot engine also requires more compression to convert furl into energy as compared to the colder one. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . Remove the air filter, wash it with detergent and water and scrub off the dirt with a brush. Recognised as a leading saw in the forestry industry, it is available in guide bar lengths 13"/32cm to 18"/45cm. Can anyone make a suggestion. If the air filter is too clogged, you should replace it. Poke the oil feed hole with a 16-gauge wire to unclog it until it slides through the hole smoothly. 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. A drastic and frankly silly thing to do though . Any help out thereEGBinOR Get you some Sea Foam at the local auto parts store. A large engine has a huge capacity in its motor. Make sure you have a replacement spark plug on hand in case the problem recurs in the future. You will notice the compression less. Lift the bars nose and tighten the nuts on the sidebar to secure the sidebar and guide bar in place. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. You can clean and mildly clogged carburetor but if it is too severe, replace it with one compatible with your chainsaw model. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. There is no carbon build up and all looks like new. Modern View Forum powered by phpBB 2001, 2005 phpBB Group. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. It is best to put a new plug in after clearing. Uninstall the spark arrestor and unblock it using a brush, but you can also replace it for efficiency. Check for clogging around the bar oil. Usually, this happens when you use a chainsaw after a very long time or by wear and tear of the rope. Each chainsaw has a different level of compression. I;ve read somewhere to put water? I bought 2 032 Stihl saws at auction that pulled very hard. 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. Gas with ethanol also burns hotter than gasoline which can cause the engine to overheat and burn the plug electrodes. There is no idle when I release the trigger. 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. Take off the muffler or the carb to get access. Required fields are marked *. The saw runs and starts great. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. But it was stolen along with other tools around 1990. I hope my epic guides will help you to choose,buy and maintain chainsaw. Yeah, I must have flooded it as I was working on it. water will not dissolve carbon; it is far too hard to be effected. Insufficient fuel in the system may result in excessive compression. 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. The compression limit should also be doubled if the engine capacity is 100 CC. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. You are misunderstanding WHY water is put into carboned up engines. Are you sure the starter rope isn't a little too short? Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when starting. link to Indoor Fly Traps: 5 Things You Didn't Know About Indoor Fly Traps. A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. Use recommedend chain oil lubricant. Starting fluid will make the fuel more combustible and makes the process of clearing out the combustion chamber much quicker. The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull. pulls with little resistance, similar to my farm boss. It was metering lever. I get it going now and its easier but its still a bear. Replace the spark plug with a new identical. 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. Once it's removed, you can place a gauge on the place of the spark plug. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. Being in the cutting services for more than 10 years, I know a thing or two about chainsaw. I bought 2 032 Stihl saws at auction that pulled very hard. My one and only MS250 was a kicker to start it but that was the only problem. 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! Try blowing the crankcase out with air. Quoting Removed, click Modern View to see What?? 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. 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. The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. Do that to the starter side when you're looking at the starter assy. We got rid of both of those useless things . Most fuels nowadays are a blend of ethanol which attracts moisture and speeds up the rotting process. . "width": 200, My /Sthil 034 is very difficult to start. That is a high compression saw, pull the rope slowly until you feel resistance then give it a short quick pull. A two-stroke gas-powered chainsaw uses relatively few moving parts. To inspect the guide bar, disassemble the chain cover, chain and bar. "logo": { What are the numbers on your sparkplug? If the chainsaw still wont start, it is defective and requires a replacement. All it needs is a few inches missing and it will pull too hard like the compression is too high. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. 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. Also check the air filters and make sure they are clean. A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. Carboned rings will decrease not increase compression. Would not be afraid to do it to a 4, 6, or V-8. John Deere and its logos are the registered trademarks of the John Deere Corporation. 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. Wipe off the excess fuel from the spark plug with a clean rag. Help, can't pull start Stihl MS250 chainsaw, too much compression. Once youve done that, reassemble the chainsaw, which should work properly again. You can check the compression by pulling the spark plug out and holding it in your hand. A 50CC engine needs 150 PSI compression. "@type":"DiscussionForumPosting", It works when cold-starting the engine, when the engine is idle and when the engine is open. Ok folks, I'm stumped. Turn the engine to get under the piston and blow the crankcase out. The other reason might be the use of the wrong type of oil for the climate. However, if I push downward on the trigger button, it slows down to. And some will have more. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. JavaScript is disabled. You are using an out of date browser. Turn the engine to get under the piston and blow the crankcase out. Then Google decarb . It would give you rusted bearings. Loosen the nuts holding the clutch cover and disconnect the chain shroud and remove the oil plate. Check the chain tension and adjust it if it is too loose or tight. "author": { Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. "text": "My chainsaw has gotten very hard to pull the rope. Press question mark to learn the rest of the keyboard shortcuts. You have an option to either pull off the starter and clean it or look for an ideal replacement for your starter house. It was easier to pull after I cleaned it up, but still tough. The spark arrestor in a chainsaw traps exhaust products emitted from an internal combustion engine. Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. All it needs is a few inches missing and it will pull too hard like the compression is too high. As far as compression, you can usually tell by how the saw pulls when starting it. 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.. What is the minimum compression for my STIHL chainsaw? Step 1: Prepare the chainsaw Remove the spark plug from the chainsaw. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. As a result, normal compression settings will change based on the kind of chainsaw machine you are using. The saw runs and starts great. Would not be afraid to do it to a 4, 6, or V-8. Get you some Sea Foam at the local auto parts store. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. #1. Stihl recommends using 89 octane gasoline without ethanol, and the gas should not contain more than 10% ethanol. As long as I can get it going.. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) 4 Possible Problems & Solutions Problem 1: Damaged starter housing Solution: 1. The Pulley compartment plays a massive role in retracting the ignition rope. Low pressure, 20 to 30 pounds is all you need. 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. 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. or Best . When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Also check the air filters and make sure they are clean. Check for side play in the crankshaft. I think you'll like it. It prevents the carburetor from allowing too much fuel into the combustion chamber. 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. 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. I hook up a drill to the nut on the clutch and start hard starting saws that way . The owner is complaining of hard to pull start. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. I would never put water in it! Soaking in water will do nothing but rust things up . I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. 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. There might be a small stone or thing that is stuck inside the starter and causes the rope not to retract. Too much hot or cold engine does not work or even start to produce vacuum pressure inside engine. If anything prevents the right amount of fuel into the combustion chamber, the chainsaw wont start. Choke cannot be used even when engine cold, or flooding occurs. Wear rubber gloves and hold the rubber plug and spark plug about 1-2cm from the metal surface of the engine unit. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. 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 There are sprays (power tune) for removing carbon, but I doubt if that's your problem. If your saw doesn't have a compression release since like you say its not a pro, then the two things I would check is either the go through recoil assembley with a fine tooth comb. Yes I tried that last time and it did help some. Try it, it may just do the trick! If you buy another battery, make sure it has the same voltage and amperage as the old battery. 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 In most cases, a buildup of carbon under the rings presses the rings against the cylinder, culminating in compression of the cylinder. John Deere and its logos are the registered trademarks of the John Deere Corporation. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. If you regularly use the chainsaw, then there might be the possibility that your starter spring breaks off. On a 2 stroke the water would go into the crank case first and pool up. That is the nature of a 250. Stihl is a leading manufacturer of chainsaws and other handheld outdoor and landscaping power tools. A chainsaw is going to be exposed to oxidation over time, but you can at least limit the process by storing your chainsaw well. 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. The other cause of your chainsaws high compression could be the stuck ignition rope. Hope this helps. The end of the tester must protrude exact the same volume into the cylinder as the spark plug or the reading will be wrong. Are you sure the starter rope isn't a little too short? Block the spark plugs hole by putting a nylon rope to prevent the piston from moving. After initial pull on rope (which feels like vapor lock on cylinder), saw will start on second or third pull. 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?? 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. "name": "Yesterday's Tractor Co.", Hello. Thanks. Cleaned air filters and both were very dirty. 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 a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. 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. Stihl MS 250 Chain Saw: The pull start will barely move the flywheel. 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. Try it, it may just do the trick! When the engine starts running, turn the choke off. You can also quickly fix this anomaly by ensuring a proper troubleshooting of the pulley compartment to find damages. I've done it to high hour Kohler engines many times. If you suspect a compression issue, seek professional help as compression repairs can be complicated. Could your gauge be off a little? Don't know what to do at this point. Thus far, you have learned how to diagnose most problems with the Stihl chainsaw and how to fix the issues. I've got one here with 105-110 compression that I can't get to run and it feels kinda funny when I pull the starter rope, like it has compression with the piston going up and down. 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. You can use a ratchet to do the task. I went with a meteor piston/cylinder set. I'm an arborist by profession & a blogger by passion. Check the chainsaws fuel if you have not used the tool for a while. Even though it was purchased "brand new" I'm not so sure. You can prevent the new starter rope from fraying by burning the two ends of the rope. Register today and take advantage of membership benefits. 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. 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. Use a screw wrench to loosen the nuts on the guide bar side panel to give you room to adjust the chain. It is possible however to flood a two stroke which can cause the plug to fowl. Generally the minimum is 110 lbs. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Also take the spark plug out and do the same. Obviously, the motor, which has a huge capacity, will require more compression. It would give you rusted bearings. Take better care of your chainsaw and perform regular maintenance according to the manufacturers recommendations to prevent any of these problems. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? If it has to do with small engines, it's welcome here. If that doesnt work, try gently tapping on the side of the bulb with a screwdriver or other tool. It runs good after I get it started. Create an account to follow your favorite communities and start taking part in conversations. link to Winterize Your Pool Like a Pro: A Comprehensive Guide for Home owners. When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. 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. "@type": "WebPage", Dont substitute it with. 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. Start new topic; Recommended Posts. Disengage the chain brake, turn on the ignition switch and install the new spark plug into the rubber connector. The exhaust is black but no build up. Sometimes the spring stops working correctly due to overuse and becomes brittle. Try blowing the crankcase out with air. If it is the right sparkplug and not flooded, I would maybe buy a different saw with easy start. A heavy-duty engine gets hot faster and works better than a cold engine. 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. A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips. It's also going to be wise to try to put the chainsaw somewhere that isn't exposed to constant sunlight since that can be a contributing factor to the oxidation. This Indoor Fly Traps: 5 Things You Didn't Know About Indoor Fly Traps. Not sure it would accomplish anything on a 2-stroke chain saw engine. Stihl MS290 MS390 MS310 Chainsaw Has Oil Tank Engine Housing Assembly OEM/ Bin G . Change in temperatures and dirt will cause clogging anywhere the oil passes, and this can prevent the oil from spread all across the bar. If the reading is below or above the required range, then your ignition coil requires changing. A chainsaw with no spark will shut down suddenly or not start at all. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. Remove the filter, engine control lever and Stihl carburetor. }. To clean it, drain the fuel, spray some carburetor cleaner and loosen the residue with a small brush. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. You are using an out of date browser. 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. "image": { In fact, Stihl thinks so highly of Motomix, that they will double the factory warranty on their Stihl 2-stroke tools if you use it. Make sure the keyway is lined up correctly and tighten the nut down good and tight. Unscrew the clutch assembly on top of the oil pump. How Much Does it Cost to Install a Garage Door Opener? Every chainsaw engine has a different capacity depending upon its motor power. Here is how to troubleshoot a malfunctioning spark plug. "@type": "Organization", Also, remove the muffler and check for carbon buildup. We will explain the causes of high compression and how you can quickly fix it to make it run smoothly. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. Turn off the choke by pressing the control lever to activate the fast idle. "name": "Egbinor" Without proper compression, the engine will not be able to suck and use the fuel for combustion. I missed the "no carbon". You're familiar with how to start a stihl yes? I love to write about chainsaw for homeowners and professionals. Your chainsaws compressive strength is measured with the use of a screw-in gauge. Take off the muffler or the carb to get access. Don't put water into the 2 stroke. Flooding usually happens due to an underlying issue: a bad spark plug, bad gas, or a faulty carburetor.