stihl chainsaw too much 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. 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. Then Google decarb . NelsGarage will share the knowledge Ive gathered about different tools and give you tips to accomplish your DIY projects faster. The spark plug is located in the engine and ignites the fuel and air mixture, driving the piston and running the engine. It is significantly tougher to pull over than an 024 or the new 241. Cleaned air filters and both were very dirty. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. It uncoils, tightens the spring, engages the clutch to start the engine. Unscrew the spark plug using a ratchet and screw the compression gauge in its place. Register today and take advantage of membership benefits. "name": "Egbinor" Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Turn the brake off. $75.00. 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. I think that's what happened, although I didn't think such a small amount could do it. It takes a Bosch WSR6F or NGK BPMR7A. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. after that I'd be looking at crank bearings. 3 9 9 comments Best Add a Comment Revolutionary-Act469 2 yr. ago Doesn't pull at all or just hard to pull. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. I bought it used around 1978. When the fuel starts to turn stale, it gums up and clogs the carburetor just as it would in an unused lawnmower. 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. If the starter spring is keep working correctly, it will retract the ignition rope. Sometimes, the ignition rope is frayed or stuck inside the starter housing. Turn the engine to get under the piston and blow the crankcase out. How big a fella are ya? Required fields are marked *. It was easier to pull after I cleaned it up, but still tough. Being in the cutting services for more than 10 years, I know a thing or two about chainsaw. If it is not physically damaged, clean it with clean gasoline and a rag. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Winterizing a pool is an important step in maintaining the longevity and health of your pool. I would never put water in it! It's also possible the piston or cylinder are scored or carboned up. Oct 24, 2011 / Chainsaw excessive compression #1 . If it is too damaged, you should replace it. Stihl is a leading manufacturer of chainsaws and other handheld outdoor and landscaping power tools. Now, how much compression the engine of a chainsaw needs depends upon its motor capacity and temperature. In a similar vein, if the wrong kind of oil is used, the compression may be increased. I think that's what I'd do. Low pressure, 20 to 30 pounds is all you need. The end of the tester must protrude exact the same volume into the cylinder as the spark plug or the reading will be wrong. Make sure the gap is according to the specifications of your chainsaws engine. Create an account to follow your favorite communities and start taking part in conversations. 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. If this does not fix the issue, it may be necessary to replace the whole starting rope system with another one. The key on the flywheel is in place and not sheered. If the compression is not produced in the engine at an appropriate level, it will not be able to convert fuel into energy. If any of these components are worn or broken, the chain saw wont start even with fuel. You are misunderstanding WHY water is put into carboned up engines. The first step is to remove the cover that covers the spark plug on your chainsaw. Pull the rope until it starts. If it does maybe it is plugged. How Much Does it Cost to Install a Garage Door Opener? How does it feel with the spark plug removed? Also, remove the muffler and check for carbon buildup. Flooding usually happens due to an underlying issue: a bad spark plug, bad gas, or a faulty carburetor. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. The compression limit should also be doubled if the engine capacity is 100 CC. All it needs is a few inches missing and it will pull too hard like the compression is too high. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Get it ported and it brings it to another level. I bought 2 032 Stihl saws at auction that pulled very hard. Other than damaged parts, using the choke position to start a warm saw often causes a flooded engine. Help, can't pull start Stihl MS250 chainsaw, too much compression. At this point, the battery will reset,, Read More How To Reset Echo 58-Volt Battery ChargerContinue, The chainsaw battery charger is constantly blinking red, even after charging for a long time!!! Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. Replace the spark plug with a new identical. 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 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. Disconnect the spark plug from the engine and inspect if it is damaged, eroded, or dirty. }, A drastic and frankly silly thing to do though . 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. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. Take off the muffler or the carb to get access. 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. If you suspect a compression issue, seek professional help as compression repairs can be complicated. Check if the wires are damaged or broken and replace them if necessary. 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. Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? 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. Low pressure, 20 to 30 pounds is all you need. MS250 start compression relief stopped working. Sometimes the spring stops working correctly due to overuse and becomes brittle. 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. 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. 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. As the chain moves over the bar, it spreads the oil across the moving parts to reduce friction and heat. or Best . A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. Choke cannot be used even when engine cold, or flooding occurs. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. "@type": "Organization", of compression. Get you some Sea Foam at the local auto parts store. If a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. You should also make sure the new gas you use is appropriate for the chainsaw. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Check the choke of the chainsaws engine and make sure it is completely closed. 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. When this pressure, or compression, is too low or high, the chainsaw . Check the spark plug and replace it if needed. All it needs is a few inches missing and it will pull too hard like the compression is too high. 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. Mar 22, 2017. Could your gauge be off a little? Also take the spark plug out and do the same. "interactionStatistic": { You're familiar with how to start a stihl yes? Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. I'll even do the labor for free. Dont substitute it with. 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. Below we have discussed the most common reasons why your chainsaw wont idle and the best way to fix it. 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. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. #3. Don't put water into the 2 stroke. Versions MS 260, Bar length 37cm, RSC The owner is complaining of hard to pull start. My first chain saw was an old Homelite EZ with a blue metal case and a 20" bar. As far as compression, you can usually tell by how the saw pulls when starting it. Detailed, well-researched, and accurate home and garden information presented in an understandable format is our primary goal. "@type": "ImageObject", JavaScript is disabled. 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. Any ideas? Wipe off the excess fuel from the spark plug with a clean rag. It is harmful to your machine to use old fuel. Try it, it may just do the trick! Get you some Sea Foam at the local auto parts store. 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. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. Would not be afraid to do it to a 4, 6, or V-8. It may not display this or other websites correctly. Another big issue that causes too much high compression is the lack of oil in the starter system. 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've done it to high hour Kohler engines many times. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. The carburetor is a significant part of the chainsaw. John Deere and its logos are the registered trademarks of the John Deere Corporation. Always change the spark plug after 100 operating hours of the chainsaw to avoid engine problems. It is effortless to check the starter spring; pull the ignition rope. There might be a small stone or thing that is stuck inside the starter and causes the rope not to retract. How Much Compression Should a Chainsaw Have. Would not be afraid to do it to a 4, 6, or V-8. In this case fixing or repairing is required or worst replacing the engine all at once. I think that's what I'd do. $20.00 shipping. Create an account to follow your favorite communities and start taking part in conversations. Im Nelson, a DIY enthusiast with a bottomless can-do attitude. Every chainsaw requires a specific amount of compression if this compression is more or less than the required amount, the engine will not be able to produce energy from the fuel source, and it will be exhausted faster. (there is some play when flywheel on shaft (nut not attached) 3. tank and oiler vents are operating 4. exhaust has been removed and spark arresting screen checked (clean) 5. piston/walls checked.. no scarring After that, using a ratchet, remove the spark plug from the engine. Confirm the spark plug gap, check and adjust with a feeler gauge or gaping tool. Usually, this happens when you use a chainsaw after a very long time or by wear and tear of the rope. To fix this problem, turn off the chain saw and let it sit for about 30 minutes to allow the excess gas to evaporate. SPONSORED. Reddit and its partners use cookies and similar technologies to provide you with a better experience. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. An excessive amount of compression in your chainsaws starting rope could also be indicated by the beginning rope failing to draw. If you buy another battery, make sure it has the same voltage and amperage as the old battery. Back to top derwen1959 Long Time User Pull trigger and set full choke. 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. But it was stolen along with other tools around 1990. NelsGarage.com All Rights Reserved 2021 Theme: Prefer by, Stihl Chainsaw Troubleshooting & How-to Guide. Has someone invented a new kind of two stroke motor? People sometimes try to cut down a tree that is too big for their chainsaw. or Best Offer. Fine adjust everything and both saws start Normal now. Carboned rings will decrease not increase compression. Even with new spark plugs in, incorrectly removing and installing the spark plugs can prevent the engine from starting. Make sure it fits snug. Quoting Removed, click Modern View to see Don't put water in the saw-ever. Take better care of your chainsaw and perform regular maintenance according to the manufacturers recommendations to prevent any of these problems. It was metering lever. 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. The plug should be tight against your thumb. John Deere and its logos are the registered trademarks of the John Deere Corporation. Sometimes an adapter is needed to make a tight fit. I would suspect the timing is too early. If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. Soaking in water will do nothing but rust things up . You can follow the steps on how to troubleshoot and revive it when it wont start. 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. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when starting. That is what was told to me by the area distributor technician, Ivor from uk here and I have a stihl chainsaw and when I am hedge laying or pletching as it is called the saw only runs for 15 or 20 seconds or perhaps 1 minute at the most if there is a big cut to make the spark plug tip builds up with carbon,i use proper 2 stroke oil at a ratio of 25to1. Try it, it may just do the trick! 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. On a 2 stroke the water would go into the crank case first and pool up. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. Locate the spark plug from the top of the engine underneath the chain brake handle. If you suspect a compression issue, seek professional help as compression repairs can be complicated. Other than that, you should also use the correct spark plugs for your chainsaw. I got it going. Turn the engine to get under the piston and blow the crankcase out. 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. runs way too fast. 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 two-stroke gas-powered chainsaw uses relatively few moving parts. 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. Starting fluid will make the fuel more combustible and makes the process of clearing out the combustion chamber much quicker. If it is flooded that should clear it up. It runs good after I get it started. The Pulley compartment plays a massive role in retracting the ignition rope. If the coil is faulty, there will be no spark to start the engine and run the chainsaw. If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. You can unclog the carburetor if the clog is minor. Thank you for the responses. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. Admitted Woodaholic. Press question mark to learn the rest of the keyboard shortcuts. Can anyone make a suggestion. Its just that its nearly impossible to pull. First, remove the spark plug from the chainsaw. This can lead to serious injuries, including cuts and amputations. If that doesnt work, try gently tapping on the side of the bulb with a screwdriver or other tool. Use an adjustable wrench to loosen the two nuts on both sides of the chainsaw. Is the spark plug the correct one for the saw? The second thing, Read More Stihl Chainsaw Charger Not WorkingContinue, Your email address will not be published. I hook up a drill to the nut on the clutch and start hard starting saws that way . The ignition system is responsible for igniting the fuel and air mixture to produce energy that powers the chainsaw. in the, All Rights Reserved. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. }, Check the chain oiler and ensure it is functional. Please use the navigational links to explore our website. Check the chain tension and adjust it if it is too loose or tight. Then Google "decarb". I have a MS250 that has come up on compression since new. This could be understood by reading the further explanation below. I would never put water in it! link to Winterize Your Pool Like a Pro: A Comprehensive Guide for Home owners. The chain oil will keep the chain lubricated, keep off dirt and allow smooth movement. Thanks. Carbon buildup is yet another important factor in the increasing compression experienced by chain saws over time. Then Google decarb . Press J to jump to the feed. You can check the compression by pulling the spark plug out and holding it in your hand. The manual for this model, and the parts breakdown, show a compression release valve. "mainEntityOfPage": { "width": 200, And some will have more. The compression limit should also be doubled if the engine capacity is 100 CC. Yes I tried that last time and it did help some. . Pull the starter rope until you hear the first sign of it firing with a small burp. "userInteractionCount": 23 Of all the Stihl saws, the MS250 is the toughest to start in relation to it's size. Press J to jump to the feed. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. "@type": "WebPage", It runs good after I get it started. I think that's what I'd do. Wash the dirty filter with a non-abrasive detergent and water. You can check the compression by pulling the spark plug out and holding it in your hand. When you start the chainsaw, it triggers the worm drive to engage the oiler to send oil through a port that releases onto the bar. Even though it was purchased "brand new" I'm not so sure. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. Not sure it would accomplish anything on a 2-stroke chain saw engine. I've done it to high hour Kohler engines many times. I have a MS250 that has come up on compression since new. 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. 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. Just wondering what your opinions are of the lowest compression you can run a Stihl MS250 at. stihl ms290 farm boss; By Ron Cook December 27, 2017 in General Chat. "author": { Trying to rotate the chain while a huge piece of wood is . "height": 57 Make sure it is snug but can also move freely by hand. While rope attached to a pulley, the further connection of the pulley is with springs and pawl to make sure the pulley is tensioned and helps in retracting and spinning. Cleaned air filters and both were very dirty. Turn the idle speed clockwise until the saw idles and chain turns, and then make a one-fourth counterclockwise turn. That is the nature of a 250. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. If the chainsaw is too much compression, it may be difficult to start. I used to have a Homelite that would do that if I left gas in it. If I drop start it I can pull it through 1 compression stroke. anthonyg_ma Original Author 16 years ago Canguy, thnks for the tips! Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. An example of data being processed may be a unique identifier stored in a cookie. lol. Hold the tip of the blade and adjust the tension of the chain correctly. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Stihl 251 chainsaw. For 503552201 Cylinder Compression Plug Package Include: 3 x Cylinder Plug Cylinder Compression Plug Wear rubber gloves and hold the rubber plug and spark plug about 1-2cm from the metal surface of the engine unit. Here is how to troubleshoot a malfunctioning spark plug. This compression converts fuel (any source) into the potential energy in the engine to start it. 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. Check the tension 2. Insufficient fuel in the system may result in excessive compression. Use a can of carb cleaner sprayed into the breather/filter assembly. Remove ignition coil and muffler. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. If oil is in there it is what makes the engine feel like it is almost locked up. When there is no air for the spark to ignite, the chainsaw will start and then die after a short while. 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. Pull trigger and set full choke. You may also want to go ahead and replace the plug. check the cylinder & piston for carbon build-up, how much compression Does the chainsaw Engine need, How To Reset Echo 58-Volt Battery Charger. Change in temperatures and dirt will cause clogging anywhere the oil passes, and this can prevent the oil from spread all across the bar. Does the saw have a compression release? With the choke engaged, pull the starting rope several times again, and the chain saw should start on the third pull. To clean it, drain the fuel, spray some carburetor cleaner and loosen the residue with a small brush. "image": { It will be apparent if it is, but usually a scored saw won't run good, if at all. 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. Disengage the chain brake, turn on the ignition switch and install the new spark plug into the rubber connector. i have a ms 250. I;ve read somewhere to put water? "description":"Discussion of Chainsaw has too much compression in the Tool Talk forum followed by comments. Does the saw have a compression release? 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. Locate the tension adjustment screws to the side of the chainsaw guide bar. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. Welcome! You will notice the compression less. Check for clogging around the bar oil. 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. 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