Reddit and its partners use cookies and similar technologies to provide you with a better experience. That is what was told to me by the area distributor technician. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. I would suggest clearing the cylinder by pulling the rope with the plug out. Help, can't pull start Stihl MS250 chainsaw, too much compression A heavy-duty engine gets hot faster and works better than a cold engine. how much compression should a Stihl 044 have? - TractorByNet 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. The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. }, On a 2 stroke the water would go into the crank case first and pool up. To clean it, drain the fuel, spray some carburetor cleaner and loosen the residue with a small brush. 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!!! Pull the rope until it starts. This may sometimes jam your chainsaws rings, causing it to become inoperable. If oil is in there it is what makes the engine feel like it is almost locked up. 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 Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. How Much Compression Should a Chainsaw Have. Why is the Garage Door Opener Light Not Working? "width": 200, If the reading is below or above the required range, then your ignition coil requires changing. 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. If A two cycle engine gets flooded BADLY, oil can separate from the gas mix, accumulate in the crankcase and creates an hydrostatc lock. Help, can't pull start Stihl MS250 chainsaw, too much compression. Consequently, operating this chainsaw becomes a really difficult chore to do. 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. $99.95. To inspect the guide bar, disassemble the chain cover, chain and bar. As a result, normal compression settings will change based on the kind of chainsaw machine you are using. Locate the tension adjustment screws to the side of the chainsaw guide bar. It works when cold-starting the engine, when the engine is idle and when the engine is open. Ron Cook. "width": 200, "@type":"DiscussionForumPosting", Trying to rotate the chain while a huge piece of wood is . 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. How Many Amps Does a Garage Door Opener Use? Use a screw wrench to loosen the nuts on the guide bar side panel to give you room to adjust the chain. A compression gauge is used to measure the compression of a chainsaw which works similarly to the tire gauge. Take off the muffler or the carb to get access. 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. On a 2 stroke the water would go into the crank case first and pool up. If you do not replace the starter spring on time, it will cause you to replace the whole starter assembly. When you are doing a cold start, push the choke lever to the warm start when the engine starts to run. To fix this problem, turn off the chain saw and let it sit for about 30 minutes to allow the excess gas to evaporate. So, in our suggestion, one of the first things to check while feeling high compression is the starter spring. It's also possible the piston or cylinder are scored or carboned up. A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips. The consent submitted will only be used for data processing originating from this website. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. 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. Quoting Removed, click Modern View to see What?? Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. If it is not physically damaged, clean it with clean gasoline and a rag. The choke should be closed during a cold start to limit the air and increase the fuel in the engine to keep it running while it warms up. If the spark plug is working correctly and you have good fuel, there still has to be enough fuel in the combustion chamber for the engine to start correctly. Please use the navigational links to explore our website. I think that's what I'd do. The first step is to remove the cover that covers the spark plug on your chainsaw. chain saw compression release mod. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . All it needs is a few inches missing and it will pull too hard like the compression is too high. Most times, when the Stihl chainsaw stops working, it is never a complete breakdown. Why Does My Chainsaw Have Too Much Compression? By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. $20.00 shipping. My husky 266xp has been that away from newjust pull over slow for 2 or 3 times and then try cranking.. You are misunderstanding WHY water is put into carboned up engines. I've seen a 20psi drop with the wrong type of gauge to be pretty common. If you find the brake drum moving, you must replace the needle bearing. Sometimes an adapter is needed to make a tight fit. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. The saw feels good in my hands and its got a surprising amount of power. We are compensated for referring traffic and business to Amazon and other companies linked to on this site. So be sure to keep your chainsaw properly maintained and avoid compression problems. The Stihl 066 chainsaw uses the same type of engine most gasoline-powered yard tools use, a two-cycle combustion engine. { If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. after that I'd be looking at crank bearings. The Pulley compartment plays a massive role in retracting the ignition rope. Some of the contributing reasons include a full tank of oil, carbon buildup on the exhaust system, and malfunctioning spark plugs. It is significantly tougher to pull over than an 024 or the new 241. Has someone invented a new kind of two stroke motor? Youll need to clean the cylinder and piston to fix this thoroughly. Loosen the nuts and bolts clockwise and then pull out the oil pump gently. "@type": "Organization", It's also possible the piston or cylinder are scored or carboned up. Once the 250 is running, its fine. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. I;ve read somewhere to put water? Fine adjust everything and both saws start Normal now. Runs well, except it. 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. Remove the filter, engine control lever and Stihl carburetor. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. Every chainsaw needs to have some compression to ensure that it operates well. Even with new spark plugs in, incorrectly removing and installing the spark plugs can prevent the engine from starting. It is best to put a new plug in after clearing. If a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. Sometimes the spring stops working correctly due to overuse and becomes brittle. 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. A lot of variables might contribute to excessive compression while using a chainsaw. When the oil pimp or oiler is faulty, it will reduce the chainsaws performance and power. It would give you rusted bearings. It runs good after I get it started. Stihl is a leading manufacturer of chainsaws and other handheld outdoor and landscaping power tools. STIHL Chainsaws FAQs | STIHL Product FAQs | STIHL USA Starter fluids spray can help in those conditions Before pulling shoulder. Block the spark plugs hole by putting a nylon rope to prevent the piston from moving. Then, use a wire brush to remove all the carbon build-up from the cylinder and piston. The manual for this model, and the parts breakdown, show a compression release valve. Check if the wires are damaged or broken and replace them if necessary. You can unclog the carburetor if the clog is minor. When the motor warms up after about a minute, turn on the choke position. People sometimes try to cut down a tree that is too big for their chainsaw. Ivor from uk here and I have a stihl chainsaw and when I am hedge laying or pletching as it is called the saw only runs for 15 or 20 seconds or perhaps 1 minute at the most if there is a big cut to make the spark plug tip builds up with carbon,i use proper 2 stroke oil at a ratio of 25to1 does any pletching or hedge laying go on across the pond?? A large engine has a huge capacity in its motor. If it does maybe it is plugged. Do Chainsaws Overheat? - Common Causes and Their Solutions However, this will vary by model and compression readings alone are not enough to determine the condition of the engine. A drastic and frankly silly thing to do though . 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. "interactionType": "https://schema.org/CommentAction", Turn the idle speed clockwise until the saw idles and chain turns, and then make a one-fourth counterclockwise turn. If it does maybe it is plugged. Any ideas? Advanced arborist chainsaw with a top handle and STIHL M-Tronic technology. I usual only choke my MS250 for one pull and no longer have the flooding issue. Versions MS 260, Bar length 37cm, RSC Try it, it may just do the trick! Make sure there is oil in the engine. However, the compression also has a limitation because a very high or very low compression will cause problems and prevent your chainsaw from operating efficiently. Remove the air filter, wash it with detergent and water and scrub off the dirt with a brush. 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. That is a high compression saw, pull the rope slowly until you feel resistance then give it a short quick pull. If the chainsaw is too much compression, it may be difficult to start. Pour starting fluid into the carburetor and crank the engine several times. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. Pull the starter rope until you hear the first sign of it firing with a small burp. Sounds like it was broken in "right", show the guy how to start it and tell him to be happy. Modern View Forum powered by phpBB 2001, 2005 phpBB Group. 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. Carboned rings will decrease not increase compression. Make sure the keyway is lined up correctly and tighten the nut down good and tight. I tried draining the crankcase with the saw upside . I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Keep in mind that good maintenance and storage will reduce breakdowns and maintain your tools performance throughout its lifetime. Now, how much compression the engine of a chainsaw needs depends upon its motor capacity and temperature. Check the spark plug of the chain saw if the engine is not starting at all. When there is too much fuel, it will not ignite, and the engine wont start. The other cause of your chainsaws high compression could be the stuck ignition rope. 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. How To Fix Chainsaw Battery Charger Blinking Red? Usually, this happens when you use a chainsaw after a very long time or by wear and tear of the rope. Fuel filters trap dirt and contaminants from the fuel to prevent them from damaging the engine. How to Reprogram a Chamberlain Garage Door Opener, How to Program a Universal Garage Door Opener, Toro Lawnmower Troubleshooting & How To Guide, Bostitch Nail Gun Troubleshooting & How to Guide. after that I'd be looking at crank bearings. I hope my epic guides will help you to choose,buy and maintain chainsaw. I changed to synthitic. So, replacing the ignition rope is a better option to keep everything working smoothly without any damage. I got it going. Use a can of carb cleaner sprayed into the breather/filter assembly. Every chainsaw engine has a different capacity depending upon its motor power. An example of data being processed may be a unique identifier stored in a cookie. Also check the air filters and make sure they are clean. What are the numbers on your sparkplug? Soaking in water will do nothing but rust things up . Choke cannot be used even when engine cold, or flooding occurs. Quoting Removed, click Modern View to see Don't put water in the saw-ever. 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. I would suspect the timing is too early. 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. What Causes Too Much Compression on Poulan Chain Saws? The other reason might be the use of the wrong type of oil for the climate. Does the saw have a compression release? Keep in mind that the stuck ignition rope can also damaged other parts inside the starter assembly. Stihl 291 chainsaw too much compression Check the compression of the engine. Ensure the chain fits snugly inside of the bar and the teeth that keep it in place are not worn down too low. Sometimes, the ignition rope is frayed or stuck inside the starter housing. Other than that, you should also use the correct spark plugs for your chainsaw. 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. If you are trying to start your chainsaw in winter and the oil you used for the chainsaw assembly is not suitable for the winter season, you also feel high compression. Fine adjust everything and both saws start Normal now. Every chainsaw requires a different compression level according to its built-up and model number. I have a MS250 that has come up on compression since new. "logo": { A clear sign that you may have a chainsaw engine is when you smell gas while starting it. The plug should be tight against your thumb. How Much Compression Should A Chainsaw Have - Toolsadvisorpro Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. Another big issue that causes too much high compression is the lack of oil in the starter system. 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. Would have to remove spark plug and rinse cylinder with gas to be able to start. 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.