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The owner is complaining of hard to pull start. If a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. Detailed, well-researched, and accurate home and garden information presented in an understandable format is our primary goal. Check the chainsaws fuel if you have not used the tool for a while. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. First, remove the cylinder and piston from the chainsaw. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. Disengage the chain brake, turn on the ignition switch and install the new spark plug into the rubber connector. As long as I can get it going.. The saw is about 2 years old, light use. What usually happens is that the guide bar gets stuck in the tree and they keep running the engine while trying to force the bar out of the tree somehow. It is basically the same product as TruFuel (same base synthetic fuel with different synthetic oil) that is sold through Stihl dealers and endorsed for use in all Stihl 2-stroke engines. Quoting Removed, click Modern View to see Don't put water in the saw-ever. It is a prevalent issue and can be fixed and detected easily without consulting a mechanic. Let saw run until its warmed up, and go cut wood. Check for clogging around the bar oil. Being new carb, wasn't looking that direction educate a non mechanic. Reddit and its partners use cookies and similar technologies to provide you with a better experience. If the reading is below or above the required range, then your ignition coil requires changing. I would suspect the timing is too early. Soaking in water will do nothing but rust things up . Stihl MS 250 Chain Saw: The pull start will barely move the - JustAnswer STIHL Chainsaws FAQs | STIHL Product FAQs | STIHL USA 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. I used to have a Homelite that would do that if I left gas in it. It may not display this or other websites correctly. A hot engine also requires more compression to convert furl into energy as compared to the colder one. Chainsaws are very powerful tools, and if theyre not properly maintained, they can easily overcompress the chain, which can cause it to break. The spark arrestor in a chainsaw traps exhaust products emitted from an internal combustion engine. Chainsaw Parts. 3 9 9 comments Best Add a Comment Revolutionary-Act469 2 yr. ago Doesn't pull at all or just hard to pull. Loosen the nuts holding the clutch cover and disconnect the chain shroud and remove the oil plate. If you find the brake drum moving, you must replace the needle bearing. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. 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. What ratio mix is he using? "@type": "ImageObject", We got rid of both of those useless things . "userInteractionCount": 23 A drastic and frankly silly thing to do though . I was given (estate) a small McCulloch chain saw and it started and ran great. Get you some Sea Foam at the local auto parts store. That is the nature of a 250. That is what was told to me by the area distributor technician Check for side play in the crankshaft. 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. The ignition coil transmits electricity to the spark plug to create a spark that ignites the engine. 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. 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. Replace with a new starter house Problem 2: Damaged pulley system Solution: 1. That model is extremely easy to flood. Check for any cracks and damages and replace if necessary. How Many Amps Does a Garage Door Opener Use? pulls with little resistance, similar to my farm boss. The plug should be tight against your thumb. Insufficient fuel in the system may result in excessive compression. Check for side play in the crankshaft. If repeated cleaning does not fully unclog the carburetor, you will have to replace it. Pull trigger and set full choke. Use recommedend chain oil lubricant. Here is a link for two stroke engine air cycle. If it does maybe it is plugged. That is a high compression saw, pull the rope slowly until you feel resistance then give it a short quick pull. If you regularly use the chainsaw, then there might be the possibility that your starter spring breaks off. or Best Offer. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. John Deere and its logos are the registered trademarks of the John Deere Corporation. Any ideas? Stihl chainsaw compression test Joe_Power Jun 2, 2015 Not open for further replies. "@type": "WebPage", Take off the muffler or the carb to get access. Lift the bars nose and tighten the nuts on the sidebar to secure the sidebar and guide bar in place. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. This is because your oil is not rated to get to work at a low temperature. 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 problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. 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. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) Are you sure the starter rope isn't a little too short? What Causes Too Much Compression on Poulan Chain Saws? If you suspect a compression issue, seek professional help as compression repairs can be complicated. Yeah, I must have flooded it as I was working on it. Then, use a wire brush to remove all the carbon build-up from the cylinder and piston. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. 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. Thanks! "name": "Yesterday's Tractor Co.", Has someone invented a new kind of two stroke motor? Once it's removed, you can place a gauge on the place of the spark plug. If the starter spring is keep working correctly, it will retract the ignition rope. 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. Are you sure the starter rope isn't a little too short? To fix this problem, turn off the chain saw and let it sit for about 30 minutes to allow the excess gas to evaporate. 4 Possible Problems & Solutions Problem 1: Damaged starter housing Solution: 1. Ensure the wires leading to the On/Off switch are not tangled or in contact with the metal part of the engine if there is no spark. 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. 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. The starter assembly often fails to rotate due to a weak connection between the pulley and the ignition rope. Check for broken teeth on the chain and replace them if necessary. Low pressure, 20 to 30 pounds is all you need. . More information can be found on this page. When the air that reaches the chain saw's engine is insufficient, it becomes prone to overheating. However, these moving parts, to stay moving, require a substantial amount of compression. "mainEntityOfPage": { 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. "interactionStatistic": { Sounds like it was broken in "right", show the guy how to start it and tell him to be happy. }, The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. I love to write about chainsaw for homeowners and professionals. 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. Over time or when using the wrong fuel, the fuel filter becomes too clogged and restricts fuel flow, killing the engine shortly after starting. My /Sthil 034 is very difficult to start. I hook up a drill to the nut on the clutch and start hard starting saws that way . 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. 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. It is, therefore, necessary to determine if the problem has been remedied by adding fresh fuel. Ask him if he's drop-starting it. check the cylinder & piston for carbon build-up, how much compression Does the chainsaw Engine need, How To Reset Echo 58-Volt Battery Charger. OEM GOOD USED STIHL 048AV CHAINSAW SHORT BLOCK ENGINE 120 PSI COMPRESSION. A very loose chain will cause the blades to come out of the bar, while a very tight chain is also not ideal for the proper functioning of the chainsaw. Check if the wires are damaged or broken and replace them if necessary. It is harmful to your machine to use old fuel. Create an account to follow your favorite communities and start taking part in conversations. "interactionType": "https://schema.org/CommentAction", Try it, it may just do the trick! I think you'll like it. How To Fix Chainsaw Battery Charger Blinking Red? Create an account to follow your favorite communities and start taking part in conversations. Choke cannot be used even when engine cold, or flooding occurs. We're all about fixing small engines, from carburetor rebuilds, to crankshaft machining. What are the numbers on your sparkplug? We are compensated for referring traffic and business to Amazon and other companies linked to on this site. Is the spark plug the correct one for the saw? 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. Also take the spark plug out and do the same. Would not be afraid to do it to a 4, 6, or V-8. Your email address will not be published. You will notice the compression less. I got it started. If any of these components are worn or broken, the chain saw wont start even with fuel. I have plenty of engines with REALLY low compression that I'll be glad to swap him. "@type": "Person", This could be understood by reading the further explanation below. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. My chainsaw has gotten very hard to pull the rope. After initial pull on rope (which feels like vapor lock on cylinder), saw will start on second or third pull. Best Professional Chainsaw Reviews 2022 - Pro Tool Reviews If oil is in there it is what makes the engine feel like it is almost locked up. You need to pull the exhaust to check that. It does not take much to increase the compression. water will not dissolve carbon; it is far too hard to be effected. Don't know what to do at this point. People sometimes try to cut down a tree that is too big for their chainsaw. 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. STIHL 026 HARD TO PULL - Yesterday's Tractors Finally the fuel will be converted into energy. chain saw compression release mod - Red Power Magazine You are using an out of date browser. The engine creates a vacuum pressure inside it. It would give you rusted bearings. 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. Ron Cook. Follow the steps below on how to fix a flooded chainsaw engine. Stihl MS250 too much compression - Arborist, Chainsaw & Tree Work Forum everything is harder in a tree, not a conclusive test. Does the saw have a compression release? 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. How Much Does it Cost to Install a Garage Door Opener? Check the chain oiler and ensure it is functional. 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. 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. The saw feels good in my hands and its got a surprising amount of power. You never try to get it to run with the choke on. Turn the engine to get under the piston and blow the crankcase out. Indoor fly traps are an effective way to keep insects away from your home. 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. In a similar vein, if the wrong kind of oil is used, the compression may be increased. Do that to the starter side when you're looking at the starter assy. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. 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. Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? MS250 compression | Outdoor Power Equipment Forum 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. Find the low speed, high speed, and idle speed screws near the carburetor, start the engine and allow it to warm up. Turn the brake off. Final step: removing the old spark plug and installing the new one. If you buy another battery, make sure it has the same voltage and amperage as the old battery. 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. Disconnect the spark plug from the engine and inspect if it is damaged, eroded, or dirty. Stihl chainsaw low compression diagnoses and How To - YouTube If the air filter is too clogged, you should replace it. A chainsaw with no spark will shut down suddenly or not start at all. The saw runs and starts great. Your chainsaws compressive strength is measured with the use of a screw-in gauge. 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. Try blowing the crankcase out with air. 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. 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 Mar 22, 2017. 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.. Welcome! "height": 57 Does the saw have a compression release? That is the nature of a 250. Other than damaged parts, using the choke position to start a warm saw often causes a flooded engine. Minimum compression for a Stihl 2 cycle | Lawn Mower Forum You can use a ratchet to do the task. All it needs is a few inches missing and it will pull too hard like the compression is too high. Modern View Forum powered by phpBB 2001, 2005 phpBB Group. Temperature Of The Engine A heavy-duty engine gets hot faster and works better than a cold engine. Additionally, most spark plugs come pre-gapped. 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. Wipe off the excess fuel from the spark plug with a clean rag. I've done it to high hour Kohler engines many times. Low pressure, 20 to 30 pounds is all you need. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. I have a MS250 that has come up on compression since new. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. 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. Make sure it's greased and the bushings are good. Spark plugs that are not functioning properly are another probable cause of excessive compression. Subsequent starts are just as hard. Also take the spark plug out and do the same. The recoil starter in a chainsaw is a start mechanism that allows you to pull the rope. Garden Guides | Compression Tricks for Chainsaws As a result, normal compression settings will change based on the kind of chainsaw machine you are using. I used to have a Homelite that would do that if I left gas in it. It is like there is too much compression. I've done it to high hour Kohler engines many times. Ok folks, I'm stumped. The compression limit should also be doubled if the engine capacity is 100 CC. 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. You can also quickly fix this anomaly by ensuring a proper troubleshooting of the pulley compartment to find damages. To clean it, drain the fuel, spray some carburetor cleaner and loosen the residue with a small brush. If it is too damaged, you should replace it. I have a MS250 that has come up on compression since new. Similarly, a 4-stroke engine needs 2 times more compression than a 2-stroke engine, around 180-210 PSI. Chainsaw Too Much Compression: Causes & Solution "dateModified": "2017-08-17", As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. 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. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. Although this is often true, it is not always the case. 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. However, this will vary by model and compression readings alone are not enough to determine the condition of the engine. If anything prevents the right amount of fuel into the combustion chamber, the chainsaw wont start. 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. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. 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. It would give you rusted bearings. water will not dissolve carbon; it is far too hard to be effected. Chainsaw excessive compression - TractorByNet Recognised as a leading saw in the forestry industry, it is available in guide bar lengths 13"/32cm to 18"/45cm. Press J to jump to the feed. Wipe off lubricant and grime from the bar with a clean rag. Dont substitute it with. Remove ignition coil and muffler. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . Do that to the starter side when you're looking at the starter assy. 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.