The lack of oil dries the chainsaw assembly, which causes high compression and becomes very difficult for you to handle the chainsaw. If you refuel your chainsaw and it still won,t start, below are some of the possible causes and solutions that will get the chainsaw functioning again. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. I bought an old beater 621 Jonsered once that had very high compression, got it running well and sold it, made some money on it! ", Do Chainsaws Overheat? - Common Causes and Their Solutions Over time or when using the wrong fuel, the fuel filter becomes too clogged and restricts fuel flow, killing the engine shortly after starting. I hook up a drill to the nut on the clutch and start hard starting saws that way . Animated Two Stoke Engine Air Cycle, My husky 266xp has been that away from newjust pull over slow for 2 or 3 times and then try cranking.. My husky 266xp has been that away from newjust pull over slow for 2 or 3 times and then try cranking.. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. I hook up a drill to the nut on the clutch and start hard starting saws that way . If your chainsaw doesnt automatically turn it off or you forget, the engine cuts off immediately. Blup throttle to bring it down to idle. It runs good after I get it started. Once the 250 is running, its fine. I would never put water in it! Stihl 291 chainsaw too much compression Check the compression of the engine. or Best Offer. 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. This compression converts fuel (any source) into the potential energy in the engine to start it. Yes I tried that last time and it did help some. in the cylinder overnight because the rings are cerboned up? If the coil is faulty, there will be no spark to start the engine and run the 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?? The spark arrestor in a chainsaw traps exhaust products emitted from an internal combustion engine. It is a prevalent issue and can be fixed and detected easily without consulting a mechanic. Stihl recommends using 89 octane gasoline without ethanol, and the gas should not contain more than 10% ethanol. . It's also possible the piston or cylinder are scored or carboned up. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) Loosen the nuts and bolts clockwise and then pull out the oil pump gently. Confirm the spark plug gap, check and adjust with a feeler gauge or gaping tool. If you regularly use the chainsaw, then there might be the possibility that your starter spring breaks off. I wouldn't go messing with the carb expecting to cure the issue unless you have obvious signs of flooding when trying to start. } Oct 24, 2011 / Chainsaw excessive compression #1 . You can clean and mildly clogged carburetor but if it is too severe, replace it with one compatible with your chainsaw model. Trying to rotate the chain while a huge piece of wood is . Remove The Chainsaw's Spark Plug Set The Pressure Test Gauge Tug On The Chainsaw's Starter Rope Reset The Chainsaw's Spark Plug Do The Thumb Test Remove The Spark Plug Place Your Thumb Over The Hole Tug On Your Chainsaw's Starter Rope Problems Caused By Too Little Or Too Much Compression Low pressure in a chainsaw High compression in a chainsaw You can prevent the new starter rope from fraying by burning the two ends of the rope. in the. "width": 200, Each chainsaw has a different level of compression. A hot engine also requires more compression to convert furl into energy as compared to the colder one. 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. How Many Amps Does a Garage Door Opener Use? On a 2 stroke the water would go into the crank case first and pool up. Activate the chain brake and then place the chainsaw on a flat, leveled surface. 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. 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!!! I missed the "no carbon". Make sure it is snug but can also move freely by hand. Don't put water into the 2 stroke. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. First, remove the spark plug from the chainsaw. 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. It runs good after I get it started. I love to write about chainsaw for homeowners and professionals. Do that to the starter side when you're looking at the starter assy. Gas with ethanol also burns hotter than gasoline which can cause the engine to overheat and burn the plug electrodes. Get you some Sea Foam at the local auto parts store. Spark plugs that are not functioning properly are another probable cause of excessive compression. Quoting Removed, click Modern View to see Don't put water in the saw-ever. read more Vince O. I;ve read somewhere to put water? The spark plug is located in the engine and ignites the fuel and air mixture, driving the piston and running the engine. It very often kicks back and pulls the starter rope back in. Just wondering what your opinions are of the lowest compression you can run a Stihl MS250 at. 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. Wipe off any dirt and debris and check for any signs of damages. After initial pull on rope (which feels like vapor lock on cylinder), saw will start on second or third pull. 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. You never try to get it to run with the choke on. Let saw run until its warmed up, and go cut wood. Make sure it's greased and the bushings are good. When the motor warms up after about a minute, turn on the choke position. Use of this Web site constitutes acceptance of our. Here is a link for two stroke engine air cycle. Stihl chainsaw compression test Joe_Power Jun 2, 2015 Not open for further replies. How Much Compression Should a Stihl 066 Have? - SFGATE JavaScript is disabled. Try it, it may just do the trick! Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. 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. Press J to jump to the feed. This can lead to serious injuries, including cuts and amputations. 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. For a better experience, please enable JavaScript in your browser before proceeding. There is no idle when I release the trigger. Reddit and its partners use cookies and similar technologies to provide you with a better experience. It was easier to pull after I cleaned it up, but still tough. "@type": "Organization", Didnt somehow get straight oil in the cylinder did you? If the starter spring is keep working correctly, it will retract the ignition rope. More information can be found on this page. The saw runs and starts great. On a 2 stroke the water would go into the crank case first and pool up. The Stihl 066 chainsaw uses the same type of engine most gasoline-powered yard tools use, a two-cycle combustion engine. It is usual for the chainsaw chains to come off with continued use, but there is usually an underlying cause when its too repetitive. My husky 266xp has been that away from newjust pull over slow for 2 or 3 times and then try cranking.. Ivor from uk here and I have a stihl chainsaw and when I am hedge laying or pletching as it is called the saw only runs for 15 or 20 seconds or perhaps 1 minute at the most if there is a big cut to make the spark plug tip builds up with carbon,i use proper 2 stroke oil at a ratio of 25to1 does any pletching or hedge laying go on across the pond?? Check if the wires are damaged or broken and replace them if necessary. Pour starting fluid into the carburetor and crank the engine several times. Stihl Chainsaw Troubleshooting & How-to Guide - Nels Garage Make sure the keyway is lined up correctly and tighten the nut down good and tight. Check the saws exterior for loose bolts, nuts, and screws and tighten them with an adjustable wrench or screwdriver. Remove the air filter, wash it with detergent and water and scrub off the dirt with a brush. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. Would have to remove spark plug and rinse cylinder with gas to be able to start. If it has to do with small engines, it's welcome here. Why Is My Chainsaw Hard to Pull? (5 Things to Check) You're familiar with how to start a stihl yes? Move the selector lever up one position immediately or the saw will flood on the very next pull. } If the spark plug is too corroded or the electrode is faulty, it cannot create an electrical current to start the system. When this pressure, or compression, is too low or high, the chainsaw . "interactionStatistic": { Youre familiar with how to start a stihl yes? In this case fixing or repairing is required or worst replacing the engine all at once. Cleaned air filters and both were very dirty. I have a MS250 that has come up on compression since new. 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. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. It is thus highly recommended that you drain the fuel from your chainsaw if it still has any old gasoline left in it. I;ve read somewhere to put water? Ok folks, I'm stumped. Check the chainsaws fuel if you have not used the tool for a while. Unscrew the clutch assembly on top of the oil pump. 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. Move the selector lever up one position immediately or the saw will flood on the very next pull. Get it ported and it brings it to another level. Reassemble the chainsaw, refill the fuel tank, crank the engine and check for oil along the bar. It is best to put a new plug in after clearing. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. High compression in chainsaws is a dangerous problem that can lead to serious injuries. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. Check the tension 2. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. You should also make sure the new gas you use is appropriate for the chainsaw. First thing I'd check is the pull start assy. A clogged carburetor wont allow fuel into the engine, preventing it from starting. Free shipping. When the fuel starts to turn stale, it gums up and clogs the carburetor just as it would in an unused lawnmower. I got it started. If you recently refueled your Stihl chainsaw, stale gas can be a reason why it wont start. Too much hot or cold engine does not work or even start to produce vacuum pressure inside engine. As a result, normal compression settings will change based on the kind of chainsaw machine you are using. The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull. Try blowing the crankcase out with air. Always change the spark plug after 100 operating hours of the chainsaw to avoid engine problems. Make sure the crank taper is clean and the flywheel taper also. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. You can check the compression by pulling the spark plug out and holding it in your hand. A smaller gap will cause a weak spark and poor ignition of the engine, while a wider gap will not bring out any spark. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. MS250 compression | Outdoor Power Equipment Forum Don't know what to do at this point. No compression when pulling start rope. Carboned rings will decrease not increase compression. The extra effort to pull the saw is probably due to carbon build up on the piston crown and combustion chamber. 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, (quoted from post at 00:57:42 08/18/17) My chainsaw has gotten very hard to pull the rope. "@id":"https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=toolt&th=435118", Sounds like it was broken in "right", show the guy how to start it and tell him to be happy. The saw is about 2 years old, light use. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. 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. Help, can barley pull Stihl MS250, too much compression NelsGarage will share the knowledge Ive gathered about different tools and give you tips to accomplish your DIY projects faster. Small Engine Technician I think that's what happened, although I didn't think such a small amount could do it. STIHL Chainsaws FAQs | STIHL Product FAQs | STIHL USA So, in our suggestion, one of the first things to check while feeling high compression is the starter spring. Final step: removing the old spark plug and installing the new one. 3 9 9 comments Best Add a Comment Revolutionary-Act469 2 yr. ago Doesn't pull at all or just hard to pull. How Much Compression Should A Chainsaw Have? - Kyle's Garage If you still want to try and get carbon out of the saw either take it apart and clean it or use something along the lines of sea foam. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. It works when cold-starting the engine, when the engine is idle and when the engine is open. I'm an arborist by profession & a blogger by passion. Poke the oil feed hole with a 16-gauge wire to unclog it until it slides through the hole smoothly. link to Winterize Your Pool Like a Pro: A Comprehensive Guide for Home owners. Take off the muffler or the carb to get access. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. Also, remove the muffler and check for carbon buildup. 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. I bought 2 032 Stihl saws at auction that pulled very hard. How To Fix Chainsaw Battery Charger Blinking Red? Doesnt pull at all or just hard to pull. What is the minimum compression for my STIHL chainsaw? Check for any cracks and damages and replace if necessary. Would not be afraid to do it to a 4, 6, or V-8. Getting these problems resolved is a rather straightforward process. For 503552201 Cylinder Compression Plug Package Include: 3 x Cylinder Plug Cylinder Compression Plug To inspect the guide bar, disassemble the chain cover, chain and bar. We have explained the most effective way to unflood a chainsaw engine below. As the chain moves over the bar, it spreads the oil across the moving parts to reduce friction and heat. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Stihl MS290 Hard to pull recoil | Hearth.com Forums Home The flywheel is loose? It had a compression release, and it started and ran well. I went with a meteor piston/cylinder set. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Quoting Removed, click Modern View to see What?? The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. Although this is often true, it is not always the case. sthil 034 hard to pull the cord in Chainsaws - The Forestry Forum In most cases, a buildup of carbon under the rings presses the rings against the cylinder, culminating in compression of the cylinder. "logo": { As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Wash the dirty filter with a non-abrasive detergent and water. As the guide bar wears down with use, the bar heel- the part of the bar nearest to the drive sprocket- also wears down, which increases the distance the chain travels as the bar grooves become less effective. A large engine has a huge capacity in its motor. Stihl 026 Chainsaw hard to crank - retrofit compression relief valve Don't put water into the 2 stroke. It would give you rusted bearings. 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. Are you sure the starter rope isn't a little too short? Best Professional Chainsaw Reviews 2022 - Pro Tool Reviews So, replacing the ignition rope is a better option to keep everything working smoothly without any damage. everything is harder in a tree, not a conclusive test. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. It is possible however to flood a two stroke which can cause the plug to fowl. We and our partners use cookies to Store and/or access information on a device. 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. Don't know what to do at this point. For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. We will explain the causes of high compression and how you can quickly fix it to make it run smoothly. Not sure it would accomplish anything on a 2-stroke chain saw engine. It is significantly tougher to pull over than an 024 or the new 241. It does not take much to increase the compression. It will be apparent if it is, but usually a scored saw won't run good, if at all. All it needs is a few inches missing and it will pull too hard like the compression is too high. Stihl MS 250 Chain Saw: The pull start will barely move the flywheel. It may not display this or other websites correctly. Thus far, you have learned how to diagnose most problems with the Stihl chainsaw and how to fix the issues. I've been working on a Stihl 026 chainsaw that John found, and it is very hard to crank. You will notice the compression less. "@type":"DiscussionForumPosting", Remove the filter, engine control lever and Stihl carburetor. If the rails are shallow, you need to replace them. I think that's what I'd do. Soaking in water will do nothing but rust things up . Replaced the chain and did some serious cutting and was so pleased. Would not be afraid to do it to a 4, 6, or V-8. Create an account to follow your favorite communities and start taking part in conversations. Turn the engine to get under the piston and blow the crankcase out. A 50CC engine needs 150 PSI compression. 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. Pull the rope until it starts. Hold the tip of the blade and adjust the tension of the chain correctly. As far as compression, you can usually tell by how the saw pulls when starting it. 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. Check the chain oiler and ensure it is functional. Sometimes the spring stops working correctly due to overuse and becomes brittle. 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. "@context":"https://schema.org", You can check the compression by pulling the spark plug out and holding it in your hand. I'm also going to double check it has the correct resistor type spark plug. If any of these components are worn or broken, the chain saw wont start even with fuel. 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. What are the numbers on your sparkplug? Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Try taking it out, Then holding the trigger while you pull fast. I can probably find one with at most 65 PSI. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. Press question mark to learn the rest of the keyboard shortcuts. I hook up a drill to the nut on the clutch and start hard starting saws that way . Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. 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. My question is what is causing the trigger to not slow down. 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 A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. John Deere and its logos are the registered trademarks of the John Deere Corporation. TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders.