For a better experience, please enable JavaScript in your browser before proceeding. Pull trigger and set full choke. JavaScript is disabled. I;ve read somewhere to put water? That model is extremely easy to flood. Are you sure the starter rope isn't a little too short? I'm also going to double check it has the correct resistor type spark plug. How To Fix Chainsaw Battery Charger Blinking Red? The plug should be tight against your thumb. Low pressure, 20 to 30 pounds is all you need. 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 Reddit and its partners use cookies and similar technologies to provide you with a better experience. The spark arrestor in a chainsaw traps exhaust products emitted from an internal combustion engine. Below are the reasons the chain keeps coming loose and how to fix it. Check the chain tension and adjust it if it is too loose or tight. Thus far, you have learned how to diagnose most problems with the Stihl chainsaw and how to fix the issues. Replaced the chain and did some serious cutting and was so pleased. Create an account to follow your favorite communities and start taking part in conversations. Pull the starter rope until you hear the first sign of it firing with a small burp. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Whether you are a beginner or a professional woodworker, knowing how to fix your chainsaw will save you time and money seeking help from a service center. 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. Could your gauge be off a little? Hello D beatty, Here is a link for two stroke engine air cycle, Guido. It does not take much to increase the compression. I hope you understand the problems why your chainsaw is hard to pull. The other reason might be the use of the wrong type of oil for the climate. Use an adjustable wrench to loosen the two nuts on both sides of the chainsaw. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. 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. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. The spark plug is located in the engine and ignites the fuel and air mixture, driving the piston and running the engine. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. You are misunderstanding WHY water is put into carboned up engines. "publisher": { By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Stihl recommends using 89 octane gasoline without ethanol, and the gas should not contain more than 10% ethanol. "@type":"DiscussionForumPosting", Suitable Replacement Stihl MS 250 C Compression Release Parts Also take the spark plug out and do the same. }, 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. Carboned rings will decrease not increase compression. Just wondering what your opinions are of the lowest compression you can run a Stihl MS250 at. water will not dissolve carbon; it is far too hard to be effected. $75.00. lol. Repair or replace the damaged part 2. Locate the spark plug from the top of the engine underneath the chain brake handle. Keep in mind that good maintenance and storage will reduce breakdowns and maintain your tools performance throughout its lifetime. Generally the minimum is 110 lbs. It was easier to pull after I cleaned it up, but still tough. Even with new spark plugs in, incorrectly removing and installing the spark plugs can prevent the engine from starting. Why is the Garage Door Opener Light Not Working? Would not be afraid to do it to a 4, 6, or V-8. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Chainsaw Parts. Trying to rotate the chain while a huge piece of wood is . The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. So be sure to keep your chainsaw properly maintained and avoid compression problems. If the spark plug is too corroded or the electrode is faulty, it cannot create an electrical current to start the system. 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. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. It would give you rusted bearings. Likewise, low compression in the engine will be slow and retarding and it is a warning sign of leakage in your engine. Let saw run until its warmed up, and go cut wood. First thing I'd check is the pull start assy. stihl ms290 farm boss; By Ron Cook December 27, 2017 in General Chat. Don't put water into the 2 stroke. 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. The piston and rings are very shiney. 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. What ratio mix is he using? If it does maybe it is plugged. It had a compression release, and it started and ran well. Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. The carburetor is a significant part of the chainsaw. The owner is complaining of hard to pull start. Any chance is it hydro locking because of gas? If the chainsaw is too little compression, it may start easily but will not run smoothly. It is a prevalent issue and can be fixed and detected easily without consulting a mechanic. "@type": "WebPage", Make sure it is snug but can also move freely by hand. Fine adjust everything and both saws start Normal now. 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. I tried draining the crankcase with the saw upside . Then Google decarb . However, these moving parts, to stay moving, require a substantial amount of compression. If it has damaged parts, replace it with a carburetor kit that fits your chainsaw model. The following have been addressed. 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. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. That is a high compression saw, pull the rope slowly until you feel resistance then give it a short quick pull. I get it going now and its easier but its still a bear. Some of the contributing reasons include a full tank of oil, carbon buildup on the exhaust system, and malfunctioning spark plugs. You can check the compression by pulling the spark plug out and holding it in your hand. Yes I tried that last time and it did help some. 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. Stihl MS 250 Chain Saw: The pull start will barely move the flywheel. You will notice the compression less. Advanced arborist chainsaw with a top handle and STIHL M-Tronic technology. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. When there is too much fuel, it will not ignite, and the engine wont start. Flooding usually happens due to an underlying issue: a bad spark plug, bad gas, or a faulty carburetor. 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. anthonyg_ma Original Author 16 years ago Canguy, thnks for the tips! Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. You need to pull the exhaust to check that. Posted December 27, 2017. The Stihl 066 chainsaw uses the same type of engine most gasoline-powered yard tools use, a two-cycle combustion engine. It's also possible the piston or cylinder are scored or carboned up. Stihl 024 - Sherlock Holmes issue - help needed here. "width": 200, When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. I think that's what I'd do. everything is harder in a tree, not a conclusive test. 3 9 9 comments Best Add a Comment Revolutionary-Act469 2 yr. ago Doesn't pull at all or just hard to pull. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . 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. I got it started. The ignition system is responsible for igniting the fuel and air mixture to produce energy that powers the chainsaw. 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. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", 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. Don't put water into the 2 stroke. I would never put water in it! Some of our partners may process your data as a part of their legitimate business interest without asking for consent. We have explained the most effective way to unflood a chainsaw engine below. Pull the starter rope and look for a blue spark between the electrode of the spark plug. To avoid flooding the chainsaw when cold starting, turn the control lever to half choke after the fourth pull and then turn the lever again to the open choke position immediately when the engine starts. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. 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. Stihl is a leading manufacturer of chainsaws and other handheld outdoor and landscaping power tools. 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. Other than that, you should also use the correct spark plugs for your chainsaw. Carbon buildup is yet another important factor in the increasing compression experienced by chain saws over time. As a result of using bad fuel or leaving fuel in the chainsaw for a long time, the fuel evaporates and leaves behind a sticky substance that accumulates and clogged the carburetor. Although this is often true, it is not always the case. If that doesnt work, try gently tapping on the side of the bulb with a screwdriver or other tool. Press J to jump to the feed. 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. Wipe off the excess fuel from the spark plug with a clean rag. It is significantly tougher to pull over than an 024 or the new 241. The chain oil will keep the chain lubricated, keep off dirt and allow smooth movement. This is bad practice, and can damage your chainsaw. If the chainsaw is too much compression, it may be difficult to start. Unscrew the clutch assembly on top of the oil pump. Sounds like it was broken in "right", show the guy how to start it and tell him to be happy. ", If A two cycle engine gets flooded BADLY, oil can separate from the gas mix, accumulate in the crankcase and creates an hydrostatc lock. 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. On a 2 stroke the water would go into the crank case first and pool up. The extra effort to pull the saw is probably due to carbon build up on the piston crown and combustion chamber. How Many Amps Does a Garage Door Opener Use? If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. The switch might be damaged or the motor is burned out. 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. The flywheel is loose? read more Vince O. }, Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? A drastic and frankly silly thing to do though . Try blowing the crankcase out with air. after that I'd be looking at crank bearings. Friction is usually the cause of a rope failing to draw when it should. Consequently, operating this chainsaw becomes a really difficult chore to do. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Being new carb, wasn't looking that direction educate a non mechanic. The saw feels good in my hands and its got a surprising amount of power. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. Even though it was purchased "brand new" I'm not so sure. The compression limit should also be doubled if the engine capacity is 100 CC. It will be apparent if it is, but usually a scored saw won't run good, if at all. As long as I can get it going.. Not sure it would accomplish anything on a 2-stroke chain saw engine. Carboned rings will decrease not increase compression. If any of these components are worn or broken, the chain saw wont start even with fuel. 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. Each chainsaw has a different level of compression. Check for side play in the crankshaft. Check the spark plug of the chain saw if the engine is not starting at all. Quoting Removed, click Modern View to see Don't put water in the saw-ever. or Best . If you experience low compression, pull the muffler and check the piston and cylinder for, Read More How Much Compression Should a Chainsaw HaveContinue, The possible reasons can be the battery not being charged, properly connected, or dead. I used to have a Homelite that would do that if I left gas in it. Now, the gauge might come in a number of size variations, so you need to use an adapter to make a perfect seal between the gauge and the chainsaw. All it needs is a few inches missing and it will pull too hard like the compression is too high. First, remove the spark plug from the chainsaw. Admitted Woodaholic. Would have to remove spark plug and rinse cylinder with gas to be able to start. Sometimes, the ignition rope is frayed or stuck inside the starter housing. If you suspect a compression issue, seek professional help as compression repairs can be complicated. Fine adjust everything and both saws start Normal now. Its just that its nearly impossible to pull. Rinse the filter and allow it to air dry before reinstalling it. My /Sthil 034 is very difficult to start. The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. 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. Register today and take advantage of membership benefits. On a 2 stroke the water would go into the crank case first and pool up. Pull the starter rope until you hear the first sign of it firing with a small burp. There is no idle when I release the trigger. Locate the tension adjustment screws to the side of the chainsaw guide bar. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. The recoil starter in a chainsaw is a start mechanism that allows you to pull the rope. 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. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Starting fluid will make the fuel more combustible and makes the process of clearing out the combustion chamber much quicker. I went with a meteor piston/cylinder set. Remove ignition coil and muffler. My one and only MS250 was a kicker to start it but that was the only problem. Register today and take advantage of membership benefits. The purpose of a choke in a chainsaw is to make cold starting more effortless, but if you do not use it properly. "width": 200, Can also be used with hedge trimmer attachment HS 246. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. The carburetors work in a chainsaw engine allows the right amount of fuel and air mixture into the combustion chamber. Also take the spark plug out and do the same. "@type": "InteractionCounter", I luv my 064. My question is what is causing the trigger to not slow down. Required fields are marked *. 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. 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. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. This is because each machine is made differently and has various needs. 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. Is the spark plug the correct one for the saw? 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. 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. of compression. Turn the engine to get under the piston and blow the crankcase out. 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. Obviously, the motor, which has a huge capacity, will require more compression. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. The excess gas can be cleared simply by removing the plug and operating the starter a few times. Clean any mildly dirty parts and replace all the damaged parts. Do that to the starter side when you're looking at the starter assy. It would give you rusted bearings. The exhaust side of the piston is a warm gold. 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?? Don't know what to do at this point. If the reading is below or above the required range, then your ignition coil requires changing. 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. Check the spark plug and replace it if needed. Versions MS 260, Bar length 37cm, RSC SPONSORED. ", 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. If there is any damage to the pulley at any stage, it will cause High Compression or stiffness during a pull.. 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. If you regularly use the chainsaw, then there might be the possibility that your starter spring breaks off. The end of the tester must protrude exact the same volume into the cylinder as the spark plug or the reading will be wrong. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. John Deere and its logos are the registered trademarks of the John Deere Corporation. Also take the spark plug out and do the same. 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. However, if I push downward on the trigger button, it slows down to. Wipe off lubricant and grime from the bar with a clean rag. Step 1: Prepare the chainsaw Remove the spark plug from the chainsaw. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. You can also quickly fix this anomaly by ensuring a proper troubleshooting of the pulley compartment to find damages. I would suspect the timing is too early. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Pull the rope until it starts. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. It's from not pulling hard enough. Small Engine Technician I would suspect the timing is too early. When the motor warms up after about a minute, turn on the choke position. Turn the brake off. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. So, If you feel too much compression while pulling a chainsaw, the possible reasons might be as below. As far as compression, you can usually tell by how the saw pulls when starting it. 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. You can check the compression by pulling the spark plug out and holding it in your hand. I bought 2 032 Stihl saws at auction that pulled very hard. If that is true, I'd suspect that the timing is off and why it's ripping the cord from your hand. I usual only choke my MS250 for one pull and no longer have the flooding issue. The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. What worked with my MS440 kicking problem should also work with that one. If it is flooded that should clear it up. Being in the cutting services for more than 10 years, I know a thing or two about chainsaw. Make sure it fits snug. 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. A heavy-duty engine gets hot faster and works better than a cold engine. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", On a 2 stroke the water would go into the crank case first and pool up. I've done it to high hour Kohler engines many times. If you see any unusual movement of spring, then take it in to replace it. Would not be afraid to do it to a 4, 6, or V-8. We got rid of both of those useless things . If the air filter is too clogged, you should replace it. However, you still have to confirm the size of the gap before installing. 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. 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. Check for clogging around the bar oil. I think that's what I'd do. Any ideas? I think that's what I'd do. Replace the spark plug with a new identical. Try it, it may just do the trick! You can unclog the carburetor if the clog is minor. 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. Sometimes, this might be triggered by another problem that is impacting your system. Quoting Removed, click Modern View to see Don't put water in the saw-ever. Then Google "decarb". Take off the muffler or the carb to get access. Low pressure, 20 to 30 pounds is all you need. In addition, you should check the muffler and piston while youre at this point. JavaScript is disabled. I believe it was flooded, but I didn't think that little bit of fuel would make it that hard to pull but I guess so since it can't compress! If I drop start it I can pull it through 1 compression stroke. John Deere and its logos are the registered trademarks of the John Deere Corporation. Cleaned air filters and both were very dirty. Once it's removed, you can place a gauge on the place of the spark plug. Your email address will not be published. Low pressure, 20 to 30 pounds is all you need. The manual for this model, and the parts breakdown, show a compression release valve. Check the chain oiler and ensure it is functional. Too much carbon will do that, check the piston top and combustion chamber. Make sure you have a replacement spark plug on hand in case the problem recurs in the future. Get it ported and it brings it to another level. It is, therefore, necessary to determine if the problem has been remedied by adding fresh fuel. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Of all the Stihl saws, the MS250 is the toughest to start in relation to it's size. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. As the starter, spring plays a vital role in running starter assembly smoothly. Make sure the keyway is lined up correctly and tighten the nut down good and tight. Any help out thereEGBinOR Get you some Sea Foam at the local auto parts store. #3. Stihl MS290 MS390 MS310 Chainsaw Has Oil Tank Engine Housing Assembly OEM/ Bin G . "userInteractionCount": 23 runs way too fast. He checked.it clearly says that in the OP. 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. My name is Chris Ross. 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 Uninstall the spark arrestor and unblock it using a brush, but you can also replace it for efficiency. By checking & repairing/replacing these, you can fix the issue. If it is hard to pull, then check how the spring is performing. I can probably find one with at most 65 PSI. Blup throttle to bring it down to idle. A clogged carburetor wont allow fuel into the engine, preventing it from starting. The saw is about 2 years old, light use. I would suggest clearing the cylinder by pulling the rope with the plug out. If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. If anything prevents the right amount of fuel into the combustion chamber, the chainsaw wont start. Once youve done that, reassemble the chainsaw, which should work properly again. I've seen it happen a couple times. We are compensated for referring traffic and business to Amazon and other companies linked to on this site. Stihl MS192T Chainsaw Fuel Oil Tank Engine Housing Assembly OEM. More information can be found on this page.
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