The carburetor is a significant part of the chainsaw. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. 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. "@id": "https://www.yesterdaystractors.com/" Wipe off any dirt and debris and check for any signs of damages. Subsequent starts are just as hard. This is because each machine is made differently and has various needs. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Soaking in water will do nothing but rust things up . Quoting Removed, click Modern View to see What?? When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. The compression limit should also be doubled if the engine capacity is 100 CC. 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. 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. A heavy-duty engine gets hot faster and works better than a cold engine. Make sure you have a replacement spark plug on hand in case the problem recurs in the future. Just wondering what your opinions are of the lowest compression you can run a Stihl MS250 at. 4 Possible Problems & Solutions Problem 1: Damaged starter housing Solution: 1. You have an option to either pull off the starter and clean it or look for an ideal replacement for your starter house. Press question mark to learn the rest of the keyboard shortcuts. If I drop start it I can pull it through 1 compression stroke. $99.95. Press J to jump to the feed. John Deere and its logos are the registered trademarks of the John Deere Corporation. Replace the fuel filters instead of cleaning them as they are pretty affordable and easy to install too. As the starter, spring plays a vital role in running starter assembly smoothly. John Deere and its logos are the registered trademarks of the John Deere Corporation. The early 064, 044, 066 came with a red master control. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. The ignition coil transmits electricity to the spark plug to create a spark that ignites the engine. Normally it's not a problem but if it was already difficult to pull it could be. Additionally, most spark plugs come pre-gapped. Below we have discussed the most common reasons why your chainsaw wont idle and the best way to fix it. I have had the cylinder off. Maybe the piston is hitting it. The plug should be tight against your thumb. 3 9 9 comments Best Add a Comment Revolutionary-Act469 2 yr. ago Doesn't pull at all or just hard to pull. Dust particles in the air mix with the lubricating oil and clog up the air filter, therefore, preventing sufficient air from getting into the engine. The Stihl chainsaw uses a four-position lever ignition system called the master control lever. What are the numbers on your sparkplug? 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. I wouldn't go messing with the carb expecting to cure the issue unless you have obvious signs of flooding when trying to start. You are misunderstanding WHY water is put into carboned up engines. Also check the air filters and make sure they are clean. in the, All Rights Reserved. If that doesnt work, try gently tapping on the side of the bulb with a screwdriver or other tool. You are misunderstanding WHY water is put into carboned up engines. Thank you for the responses. Blup throttle to bring it down to idle. Uninstall the spark arrestor and unblock it using a brush, but you can also replace it for efficiency. Thus far, you have learned how to diagnose most problems with the Stihl chainsaw and how to fix the issues. We got rid of both of those useless things . If it is hard to pull, then check how the spring is performing. In other words, the problem is in the trigger itself, not a. carb adjustment screw. 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. Stihl 251 chainsaw. Usually, this happens when you use a chainsaw after a very long time or by wear and tear of the rope. A 250 has a fair amount of compression for a smaller saw but not that bad. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. 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. check the cylinder & piston for carbon build-up, how much compression Does the chainsaw Engine need, How To Reset Echo 58-Volt Battery Charger. Take off the muffler or the carb to get access. 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. Stihl oil has been used. I hope you understand the problems why your chainsaw is hard to pull. Sometimes, this might be triggered by another problem that is impacting your system. Some of the contributing reasons include a full tank of oil, carbon buildup on the exhaust system, and malfunctioning spark plugs. The owner is complaining of hard to pull start. I would never put water in it! Fine adjust everything and both saws start Normal now. I tried draining the crankcase with the saw upside . Replace with a new starter house Problem 2: Damaged pulley system Solution: 1. If so, show him how to start it on the ground with his foot in it or with the rear handle between his thighs. The consent submitted will only be used for data processing originating from this website. I can probably find one with at most 65 PSI. By checking & repairing/replacing these, you can fix the issue. There is no idle when I release the trigger. When there is no air for the spark to ignite, the chainsaw will start and then die after a short while. 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. So be sure to keep your chainsaw properly maintained and avoid compression problems. Low pressure, 20 to 30 pounds is all you need. Any ideas? I luv my 064. I bought 2 032 Stihl saws at auction that pulled very hard. "height": 57 To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Although this is often true, it is not always the case. If the rails are shallow, you need to replace them. Wipe off any flammable fluid from the metal surface of the engine with a clean rag. SPONSORED. Sparkplug was correct but I think it was a little flooded. To test the recoil starter, remove it and reposition the spring. Advanced arborist chainsaw with a top handle and STIHL M-Tronic technology. Modern View Forum powered by phpBB 2001, 2005 phpBB Group. Make sure the crank taper is clean and the flywheel taper also. The first step is to remove the cover that covers the spark plug on your chainsaw. However, these moving parts, to stay moving, require a substantial amount of compression. Now it has sat since the last use and I went to start it and it turned over maybe three times and the compression . NelsGarage will share the knowledge Ive gathered about different tools and give you tips to accomplish your DIY projects faster. 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. In a similar vein, if the wrong kind of oil is used, the compression may be increased. 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. "@type": "WebPage", The key on the flywheel is in place and not sheered. If it has damaged parts, replace it with a carburetor kit that fits your chainsaw model. Mar 24, 2019. Apparently gas would seep int crankcase and over several months of setting gas would evaporate leaving oil behind and first time it was pulled would suck oil into the cylinder. I've done it to high hour Kohler engines many times. or Best . "headline":"Chainsaw has too much compression", 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. after that I'd be looking at crank bearings. 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. If you could start an engine with the choke closed and not turn off the choke on time, you will end up flooding the engine with too much gas. When you are doing a cold start, push the choke lever to the warm start when the engine starts to run. It may not display this or other websites correctly. The saw runs and starts great. However, you still have to confirm the size of the gap before installing. stihl ms290 farm boss; By Ron Cook December 27, 2017 in General Chat. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", #3. If the spark plug is too corroded or the electrode is faulty, it cannot create an electrical current to start the system. 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. It's also possible the piston or cylinder are scored or carboned up. Loosen the nuts and bolts clockwise and then pull out the oil pump gently. 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. Register today and take advantage of membership benefits. You will notice the compression less. "@type": "Organization", Check the spark plug of the chain saw if the engine is not starting at all. Is the spark plug the correct one for the saw? Turn the engine to get under the piston and blow the crankcase out. Try taking it out, Then holding the trigger while you pull fast. It does not take much to increase the compression. You can also quickly fix this anomaly by ensuring a proper troubleshooting of the pulley compartment to find damages. If the compression is not produced in the engine at an appropriate level, it will not be able to convert fuel into energy. Can also be used with hedge trimmer attachment HS 246. I hope my epic guides will help you to choose,buy and maintain chainsaw. It would give you rusted bearings. "interactionType": "https://schema.org/CommentAction", Below are the reasons the chain keeps coming loose and how to fix it. How big a fella are ya? A chainsaw Battery blinking red is one of the most frustrating things a woodcutter can, Read More How To Fix Chainsaw Battery Charger Blinking Red?Continue, The standard compression reading required for most 2-cycle chainsaw is around 100-110 psi to start. This may sometimes jam your chainsaws rings, causing it to become inoperable. Unscrew the clutch assembly on top of the oil pump. Obviously, the motor, which has a huge capacity, will require more compression. Your ignition rope must be intact properly with the pulley to work correctly. $75.00. 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. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. A compression gauge is used to measure the compression of a chainsaw which works similarly to the tire gauge. 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. 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. 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 No compression when pulling start rope. Also take the spark plug out and do the same. It will be apparent if it is, but usually a scored saw won't run good, if at all. Any ideas? My one and only MS250 was a kicker to start it but that was the only problem. Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. everything is harder in a tree, not a conclusive test. We have explained the most effective way to unflood a chainsaw engine below. Welcome! #1. } Would not be afraid to do it to a 4, 6, or V-8. Soaking in water will do nothing but rust things up . It is possible however to flood a two stroke which can cause the plug to fowl. I would suspect the timing is too early. An excessive amount of compression in your chainsaws starting rope could also be indicated by the beginning rope failing to draw. 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. . As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. It runs good after I get it started. It is possible however to flood a two stroke which can cause the plug to fowl. i have a ms 250. chain saw compression release mod. Other than damaged parts, using the choke position to start a warm saw often causes a flooded engine. Turn the brake off. Hello. Fine adjust everything and both saws start Normal now. It very often kicks back and pulls the starter rope back in. Too much hot or cold engine does not work or even start to produce vacuum pressure inside engine. Quoting Removed, click Modern View to see Don't put water in the saw-ever. Press question mark to learn the rest of the keyboard shortcuts. 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. Turn the engine to get under the piston and blow the crankcase out. For 503552201 Cylinder Compression Plug Package Include: 3 x Cylinder Plug Cylinder Compression Plug Make sure the keyway is lined up correctly and tighten the nut down good and tight. Don't put water into the 2 stroke. Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. { Save my name, email, and website in this browser for the next time I comment. Stihl MS290 MS390 MS310 Chainsaw Has Oil Tank Engine Housing Assembly OEM/ Bin G . When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. I used to have a Homelite that would do that if I left gas in it. 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 Your email address will not be published. Soaking in water will do nothing but rust things up . Carboned rings will decrease not increase compression. 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. Pull the recoil off and check for binding Pull rope or starter pawls misaligned. MS250 start compression relief stopped working. That is the nature of a 250. It would give you rusted bearings. There might be a small stone or thing that is stuck inside the starter and causes the rope not to retract. pulls with little resistance, similar to my farm boss. Trying to rotate the chain while a huge piece of wood is . It is best to put a new plug in after clearing. 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 clean and mildly clogged carburetor but if it is too severe, replace it with one compatible with your chainsaw model. or Best Offer. This could be understood by reading the further explanation below. link to Indoor Fly Traps: 5 Things You Didn't Know About Indoor Fly Traps. }. A clear sign that you may have a chainsaw engine is when you smell gas while starting it. Other than that, you should also use the correct spark plugs for your chainsaw. idle. To ensure correct functioning and to prevent excessive compression, you might have to repair worn-out parts with new ones. 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. 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. Most Stihl chainsaws have a resistance of 0.2-3.0 ohm on the primary coil and 5-20 kiloohm on the secondary coil but always confirm the correct reading for your model number. Make sure it is snug but can also move freely by hand. It's an older saw I bought at a garage sale. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. The compression limit should also be doubled if the engine capacity is 100 CC. Rinse the filter and allow it to air dry before reinstalling it. Not sure it would accomplish anything on a 2-stroke chain saw engine. If it looks physically fine after cleaning it and you havent changed it in a few seasons, you should still replace 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. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. Currently I live in Austin, United States. Admitted Woodaholic. 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. Unscrew the spark plug using a ratchet and screw the compression gauge in its place. Recognised as a leading saw in the forestry industry, it is available in guide bar lengths 13"/32cm to 18"/45cm. Carbon build-up in cylinder & piston, bad needle bearing, overused starter spring, oil in the starter system, old or bad fuel, etc can cause too much compression in Chainsaws. Once it's removed, you can place a gauge on the place of the spark plug. 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. If the chainsaw is too little compression, it may start easily but will not run smoothly. 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. in the cylinder overnight because the rings are cerboned up? Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Try it, it may just do the trick! By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. Lift the bars nose and tighten the nuts on the sidebar to secure the sidebar and guide bar in place. Can anyone make a suggestion. Didnt somehow get straight oil in the cylinder did you? The second thing, Read More Stihl Chainsaw Charger Not WorkingContinue, Your email address will not be published. It was easier to pull after I cleaned it up, but still tough. Press J to jump to the feed. Also, remove the muffler and check for carbon buildup. A chainsaw with no spark will shut down suddenly or not start at all. It had a compression release, and it started and ran well. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. 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. How does it feel with the spark plug removed? Check the chainsaws fuel if you have not used the tool for a while. Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. }, If any part of a carburetor has issues, the right amount of fuel/air mixture wont pump into the chamber, therefore, preventing the engine from starting. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. If you recently refueled your Stihl chainsaw, stale gas can be a reason why it wont start. } I get it going now and its easier but its still a bear. I was given (estate) a small McCulloch chain saw and it started and ran great. Would have to remove spark plug and rinse cylinder with gas to be able to start. I have plenty of engines with REALLY low compression that I'll be glad to swap him. Wipe off the excess fuel from the spark plug with a clean rag. A drastic and frankly silly thing to do though . "name": "Egbinor" As a result, normal compression settings will change based on the kind of chainsaw machine you are using. Find the low speed, high speed, and idle speed screws near the carburetor, start the engine and allow it to warm up. It was metering lever. Insufficient fuel in the system may result in excessive compression. First thing I'd check is the pull start assy. Check for clogging around the bar oil. The flywheel is loose? 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. 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. "width": 200, To ensure that enough air reaches the chain saw's engine, remove the air filter and clean or replace it, depending on the manufacturer's instructions. "@type": "ImageObject", in the. runs way too fast. My first chain saw was an old Homelite EZ with a blue metal case and a 20" bar. It is, therefore, necessary to determine if the problem has been remedied by adding fresh fuel. Do that to the starter side when you're looking at the starter assy. The switch might be damaged or the motor is burned out. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. A 50CC engine needs 150 PSI compression. I bought it used around 1978. A smaller gap will cause a weak spark and poor ignition of the engine, while a wider gap will not bring out any spark. The correct tension of the chainsaw chain should be slightly loose on the guide bar but tight enough that you cant pull the drive links out of the bar to fix the chain tension issues; follow the steps below. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. 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 lot of variables might contribute to excessive compression while using a chainsaw. Don't put water into the 2 stroke. Stihl chainsaw compression test Joe_Power Jun 2, 2015 Not open for further replies. 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. The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. A chainsaw is going to be exposed to oxidation over time, but you can at least limit the process by storing your chainsaw well. The end of the tester must protrude exact the same volume into the cylinder as the spark plug or the reading will be wrong. Youll need to clean the cylinder and piston to fix this thoroughly. Replaced the chain and did some serious cutting and was so pleased. 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. The power of the motor of an engine is measured in its capacity. water will not dissolve carbon; it is far too hard to be effected. You are using an out of date browser. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. 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. Suitable Replacement Stihl MS 250 C Compression Release Parts Also check the air filters and make sure they are clean. The lack of oil dries the chainsaw assembly, which causes high compression and becomes very difficult for you to handle the chainsaw. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . Most times, when the Stihl chainsaw stops working, it is never a complete breakdown. "description":"Discussion of Chainsaw has too much compression in the Tool Talk forum followed by comments. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. 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 the chain oiler and ensure it is functional. 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.