"text": "My chainsaw has gotten very hard to pull the rope. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Loosen the nuts and bolts clockwise and then pull out the oil pump gently. Rinse the filter and allow it to air dry before reinstalling it. I've been working on a Stihl 026 chainsaw that John found, and it is very hard to crank. Sometimes, the ignition rope is frayed or stuck inside the starter housing. Even though it was purchased "brand new" I'm not so sure. "@type": "Person", The extra effort to pull the saw is probably due to carbon build up on the piston crown and combustion chamber. Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when starting. The Pulley compartment plays a massive role in retracting the ignition rope. If the spark plug is too corroded or the electrode is faulty, it cannot create an electrical current to start the system. Wash the dirty filter with a non-abrasive detergent and water. 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. Fuel filters trap dirt and contaminants from the fuel to prevent them from damaging the engine. This is because your oil is not rated to get to work at a low temperature. Make sure it's greased and the bushings are good. Insufficient fuel in the system may result in excessive compression. You can check the compression by pulling the spark plug out and holding it in your hand. 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 the issue persists after the addition of new fuel to the tank, there may be a fault with the gas pipelines or the fuel filters. It would give you rusted bearings. All it needs is a few inches missing and it will pull too hard like the compression is too high. 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 is snug but can also move freely by hand. Most fuels nowadays are a blend of ethanol which attracts moisture and speeds up the rotting process. And some will have more. For 503552201 Cylinder Compression Plug Package Include: 3 x Cylinder Plug Cylinder Compression Plug If you recently refueled your Stihl chainsaw, stale gas can be a reason why it wont start. You need to pull the exhaust to check that. You will notice the compression less. 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. If the starter spring is keep working correctly, it will retract the ignition rope. Gas with ethanol also burns hotter than gasoline which can cause the engine to overheat and burn the plug electrodes. Compression is measured by using a simple screw-in gauge. water will not dissolve carbon; it is far too hard to be effected. Thus far, you have learned how to diagnose most problems with the Stihl chainsaw and how to fix the issues. A chainsaw is going to be exposed to oxidation over time, but you can at least limit the process by storing your chainsaw well. Don't know what to do at this point. Chainsaw has too much compression - Tool Talk Forum how much compression should a Stihl 044 have? - TractorByNet You need to pull the exhaust to check that. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. "interactionStatistic": { So, in our suggestion, one of the first things to check while feeling high compression is the starter spring. How to Test Stihl 180 Compression CIMFLOK.COM More information can be found on this page. I hope you understand the problems why your chainsaw is hard to pull. Not sure it would accomplish anything on a 2-stroke chain saw engine. If it is too damaged, you should replace it. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. The saw runs and starts great. Getting these problems resolved is a rather straightforward process. Use a screw wrench to loosen the nuts on the guide bar side panel to give you room to adjust the chain. Youll need to clean the cylinder and piston to fix this thoroughly. If I drop start it I can pull it through 1 compression stroke. Turn the engine to get under the piston and blow the crankcase out. Stihl recommends using 89 octane gasoline without ethanol, and the gas should not contain more than 10% ethanol. 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. A faulty spark plug will have carbon, dirt, and oil blocking the insulator nose, preventing it from firing consistently. This can lead to serious injuries, including cuts and amputations. Don't put water into the 2 stroke. Turn the engine to get under the piston and blow the crankcase out. 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. 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. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . If oil is in there it is what makes the engine feel like it is almost locked up. Turn the idle speed clockwise until the saw idles and chain turns, and then make a one-fourth counterclockwise turn. read more Vince O. It is significantly tougher to pull over than an 024 or the new 241. How Much Does it Cost to Install a Garage Door Opener? water will not dissolve carbon; it is far too hard to be effected. Drain and discard the old fuel, mix new fuel and cycle oil in the ratio 50:1 in a container, shake it and then pour the mixture into the chainsaws fuel tank. Spark plugs that are not functioning properly are another probable cause of excessive compression. The other reason might be the use of the wrong type of oil for the climate. Remove the spark plug with a spark plug wrench and clean it with a brush to remove carbon scoring and dirt. If the chainsaw is too much compression, it may be difficult to start. I can probably find one with at most 65 PSI. Try blowing the crankcase out with air. First, remove the cylinder and piston from the chainsaw. What Causes Too Much Compression on Poulan Chain Saws? Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Back to top derwen1959 Long Time User Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. I;ve read somewhere to put water? Also check the air filters and make sure they are clean. Check the chainsaws fuel if you have not used the tool for a while. I missed the "no carbon". Make sure the gap is according to the specifications of your chainsaws engine. Poke the oil feed hole with a 16-gauge wire to unclog it until it slides through the hole smoothly. The engine creates a vacuum pressure inside it. chain saw compression release mod - Red Power Magazine Generally covering everything under 25 HP. The owner is complaining of hard to pull start. Generally the minimum is 110 lbs. After initial pull on rope (which feels like vapor lock on cylinder), saw will start on second or third pull. Ask him if he's drop-starting it. Would not be afraid to do it to a 4, 6, or V-8. Any ideas? I was given (estate) a small McCulloch chain saw and it started and ran great. Soaking in water will do nothing but rust things up . Check the electrode gap of the spark plug and ensure it is 0.02 inches. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. STIHL Chainsaws FAQs | STIHL Product FAQs | STIHL USA 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. Disengage the chain brake, turn on the ignition switch and install the new spark plug into the rubber connector. Make sure you have a replacement spark plug on hand in case the problem recurs in the future. Ok folks, I'm stumped. Check the saws exterior for loose bolts, nuts, and screws and tighten them with an adjustable wrench or screwdriver. The piston and rings are very shiney. The choke position is the fourth setting on the master control lever. You may also notice that the chain saw loses power during operation. Check if the wires are damaged or broken and replace them if necessary. 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. "datePublished": "2017-08-17", Make sure there is oil in the engine. Would have to remove spark plug and rinse cylinder with gas to be able to start. If you find the brake drum moving, you must replace the needle bearing. The consent submitted will only be used for data processing originating from this website. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. 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. It takes a Bosch WSR6F or NGK BPMR7A. Check the spark plug of the chain saw if the engine is not starting at all. If it looks physically fine after cleaning it and you havent changed it in a few seasons, you should still replace it. The other cause of your chainsaws high compression could be the stuck ignition rope. Friction is usually the cause of a rope failing to draw when it should. 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. Wipe off lubricant and grime from the bar with a clean rag. Turn the brake off. You can also quickly fix this anomaly by ensuring a proper troubleshooting of the pulley compartment to find damages. The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. Use of this Web site constitutes acceptance of our. I got it started. Mar 24, 2019. Stihl MS290 Hard to pull recoil | Hearth.com Forums Home 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. I would suspect the timing is too early. A lot of variables might contribute to excessive compression while using a chainsaw. 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?? None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. Ron Cook. Make sure the keyway is lined up correctly and tighten the nut down good and tight. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. If the chainsaw is too little compression, it may start easily but will not run smoothly. Although this is often true, it is not always the case. Check the tension 2. Do that to the starter side when you're looking at the starter assy. MS250 start compression relief stopped working. Stihl MS250 Too High of Compression? - Arborist, Chainsaw & Tree Work Forum Remove the filter, engine control lever and Stihl carburetor. If it is not physically damaged, clean it with clean gasoline and a rag. That is what was told to me by the area distributor technician. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. How does it feel with the spark plug removed? "@type": "InteractionCounter", Here is a link for two stroke engine air cycle. Every chainsaw requires a different compression level according to its built-up and model number. Unscrew the spark plug using a ratchet and screw the compression gauge in its place. Thanks! Cleaned air filters and both were very dirty. That model is extremely easy to flood. The lack of oil dries the chainsaw assembly, which causes high compression and becomes very difficult for you to handle the chainsaw. $49.99. I think that's what happened, although I didn't think such a small amount could do it. Uninstall the spark arrestor and unblock it using a brush, but you can also replace it for efficiency. A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. Also check the air filters and make sure they are clean. Stihl MS 250 Chain Saw: The pull start will barely move the flywheel. Of all the Stihl saws, the MS250 is the toughest to start in relation to it's size. Wipe off any dirt and debris and check for any signs of damages. It is best to put a new plug in after clearing. 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. If a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. 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. 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. An engine is fit on the rear side of a chainsaw. Replace the spark plug with a new identical. When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. Why Does My Chainsaw Have Too Much Compression? You can follow the steps on how to troubleshoot and revive it when it wont start. Yeah, I must have flooded it as I was working on it. "@type": "WebPage", The switch might be damaged or the motor is burned out. The compression limit should also be doubled if the engine capacity is 100 CC. A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips. NelsGarage will share the knowledge Ive gathered about different tools and give you tips to accomplish your DIY projects faster. Move the selector lever up one position immediately or the saw will flood on the very next pull. It had a compression release, and it started and ran well. 24" is what I've got on mine, but it can handle a bigger bar. 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. Soaking in water will do nothing but rust things up . in the. But it was stolen along with other tools around 1990. 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. Keep in mind that the stuck ignition rope can also damaged other parts inside the starter assembly. Choke cannot be used even when engine cold, or flooding occurs. 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. "dateModified": "2017-08-17", Is the spark plug the correct one for the saw? i have a ms 250. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. The spark plug is located in the engine and ignites the fuel and air mixture, driving the piston and running the engine. If it does maybe it is plugged. It is like there is too much compression. 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. Stihl 024 - Sherlock Holmes issue - help needed here. A flooded engine is when there is too much gas in the combustion chamber, usually due to repeatedly starting the chainsaw using the recoil system without the engine starting. Below are the reasons the chain keeps coming loose and how to fix it. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. If you suspect a compression issue, seek professional help as compression repairs can be complicated. A smaller gap will cause a weak spark and poor ignition of the engine, while a wider gap will not bring out any spark. Several reasons can cause your Stihl chainsaw to bog down when your pull the trigger. Quoting Removed, click Modern View to see What?? If any of these components are worn or broken, the chain saw wont start even with fuel. Take better care of your chainsaw and perform regular maintenance according to the manufacturers recommendations to prevent any of these problems. If you do not replace the starter spring on time, it will cause you to replace the whole starter assembly. 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. 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. "name": "Yesterday's Tractor Co.", Repair or replace the damaged part 2. }, 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. Also check the air filters and make sure they are clean. NelsGarage.com All Rights Reserved 2021 Theme: Prefer by, Stihl Chainsaw Troubleshooting & How-to Guide. I think you'll like it. It may not display this or other websites correctly. Trying to rotate the chain while a huge piece of wood is . "@type": "ImageObject", idle. Obviously, the motor, which has a huge capacity, will require more compression. A 50CC engine needs 150 PSI compression. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", So, replacing the ignition rope is a better option to keep everything working smoothly without any damage. "name": "Egbinor" As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. It may not display this or other websites correctly. I would never put water in it! That is the nature of a 250. Best Professional Chainsaw Reviews 2022 - Pro Tool Reviews The Stihl 066 chainsaw uses the same type of engine most gasoline-powered yard tools use, a two-cycle combustion engine. Lift the bars nose and tighten the nuts on the sidebar to secure the sidebar and guide bar in place. As a result, normal compression settings will change based on the kind of chainsaw machine you are using. It uncoils, tightens the spring, engages the clutch to start the engine. You are misunderstanding WHY water is put into carboned up engines. water will not dissolve carbon; it is far too hard to be effected. The manual for this model, and the parts breakdown, show a compression release valve. Recognised as a leading saw in the forestry industry, it is available in guide bar lengths 13"/32cm to 18"/45cm. You are using an out of date browser. It runs good after I get it started. Check for side play in the crankshaft. Take off the muffler or the carb to get access. I hook up a drill to the nut on the clutch and start hard starting saws that way . Once it's removed, you can place a gauge on the place of the spark plug. High compression in chainsaws is a dangerous problem that can lead to serious injuries. Can also be used with hedge trimmer attachment HS 246. Now it has sat since the last use and I went to start it and it turned over maybe three times and the compression . As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. I have had the cylinder off. The saw feels good in my hands and its got a surprising amount of power. Additionally, most spark plugs come pre-gapped. Finally the fuel will be converted into energy. Versions MS 260, Bar length 37cm, RSC Pull the rope until it starts. If oil is in there it is what makes the engine feel like it is almost locked up. Hope this helps. I would never put water in it! Dont substitute it with. I have a MS250 that has come up on compression since new. I thought all the fuel was out but there was some in the line yet. 1. saw has new carb 2. flywheel has been removed and key inspected. Chainsaws are very powerful tools, and if theyre not properly maintained, they can easily overcompress the chain, which can cause it to break. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. I have a MS250 that has come up on compression since new. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. Likewise, low compression in the engine will be slow and retarding and it is a warning sign of leakage in your engine. If this does not fix the issue, it may be necessary to replace the whole starting rope system with another one. Compression gauges are not always accurate and different engines will provide different results. Would not be afraid to do it to a 4, 6, or V-8. runs way too fast. Press question mark to learn the rest of the keyboard shortcuts. You can prevent the new starter rope from fraying by burning the two ends of the rope. Don't put water into the 2 stroke. How To Fix Chainsaw Battery Charger Blinking Red? By checking & repairing/replacing these, you can fix the issue. I would suggest clearing the cylinder by pulling the rope with the plug out. "@type": "Organization", Help, can't pull start Stihl MS250 chainsaw, too much compression. Try blowing the crankcase out with air. 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?? $20.00 shipping. No carbon on top or on roof of cylinder. I hook up a drill to the nut on the clutch and start hard starting saws that way . Locate the spark plug from the top of the engine underneath the chain brake handle. 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. I have plenty of engines with REALLY low compression that I'll be glad to swap him. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) Chainsaw "Hard To Pull" Issues: Check & Fix (Within 5 Min) 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. OEM GOOD USED STIHL 048AV CHAINSAW SHORT BLOCK ENGINE 120 PSI COMPRESSION. In other words, the problem is in the trigger itself, not a. carb adjustment screw. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. Garden Guides | Compression Tricks for Chainsaws When the engine starts running, turn the choke off. The starter assembly often fails to rotate due to a weak connection between the pulley and the ignition rope. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. We are compensated for referring traffic and business to Amazon and other companies linked to on this site. 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. no, afraid I don't have equipment to test. Try it, it may just do the trick! It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. This is because each machine is made differently and has various needs. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", To clean it, drain the fuel, spray some carburetor cleaner and loosen the residue with a small brush. 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. We will explain the causes of high compression and how you can quickly fix it to make it run smoothly. There is no idle when I release the trigger. The saw is about 2 years old, light use. It's also possible the piston or cylinder are scored or carboned up. John Deere and its logos are the registered trademarks of the John Deere Corporation. Too much carbon will do that, check the piston top and combustion chamber. Runs well, except it. In a similar vein, if the wrong kind of oil is used, the compression may be increased. everything is harder in a tree, not a conclusive test. In this case fixing or repairing is required or worst replacing the engine all at once. let it idle over lunch, just made sure to not go too long between filling it with gas, while running of course. Stihl 064 | Outdoor Power Equipment Forum Locate the tension adjustment screws to the side of the chainsaw guide bar. Has someone invented a new kind of two stroke motor? You can clean and mildly clogged carburetor but if it is too severe, replace it with one compatible with your chainsaw model. A drastic and frankly silly thing to do though . It is effortless to check the starter spring; pull the ignition rope. 3Pcs/lot Cylinder Compression Plug For STIHL 044 046 066 MS440 MS460 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 think that's what I'd do. 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. Keep in mind that good maintenance and storage will reduce breakdowns and maintain your tools performance throughout its lifetime. Most times, when the Stihl chainsaw stops working, it is never a complete breakdown. 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.
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