The lack of oil dries the chainsaw assembly, which causes high compression and becomes very difficult for you to handle the chainsaw. Create an account to follow your favorite communities and start taking part in conversations. Without proper compression, the engine will not be able to suck and use the fuel for combustion. Sometimes the spring stops working correctly due to overuse and becomes brittle. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. If it has damaged parts, replace it with a carburetor kit that fits your chainsaw model. Suitable Replacement Stihl MS 250 C Compression Release Parts My question is what is causing the trigger to not slow down. Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. anthonyg_ma Original Author 16 years ago Canguy, thnks for the tips! It would give you rusted bearings. The Stihl 066 chainsaw uses the same type of engine most gasoline-powered yard tools use, a two-cycle combustion engine. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. A lot of variables might contribute to excessive compression while using a chainsaw. in the, All Rights Reserved. "datePublished": "2017-08-17", Stihl MS 250 Chain Saw: The pull start will barely move the - JustAnswer Too much carbon will do that, check the piston top and combustion chamber. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . The compression limit should also be doubled if the engine capacity is 100 CC. If it has to do with small engines, it's welcome here. It very often kicks back and pulls the starter rope back in. You will notice the compression less. Check for side play in the crankshaft. 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! A cold engine will need the compression of 50-100 PSI whereas a hot engine will require compression above 150 PSI. If you suspect a compression issue, seek professional help as compression repairs can be complicated. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. A heavy-duty engine gets hot faster and works better than a cold engine. If you do not replace the starter spring on time, it will cause you to replace the whole starter assembly. 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. Winterizing a pool is an important step in maintaining the longevity and health of your pool. Oct 7, 2019 / Minimum compression for a Stihl 2 cycle #3 the actual numbers will vary from one tool to another Getting accurate numbers without special tools is quite difficult because of the small volumes. Stihl 026 Chainsaw hard to crank - retrofit compression relief valve Step 1: Prepare the chainsaw Remove the spark plug from the chainsaw. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. When the air that reaches the chain saw's engine is insufficient, it becomes prone to overheating. Low pressure, 20 to 30 pounds is all you need. 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. When the oil pimp or oiler is faulty, it will reduce the chainsaws performance and power. High effort to pull start my 2-stroke blowers | Lawn Mower Forum Use an adjustable wrench to loosen the two nuts on both sides of the chainsaw. Once you identify the cause of high compression, you can repair that affected part or find a new replacement for it to make it work smoothly. Activate the chain brake and then place the chainsaw on a flat, leveled surface. Yeah, I must have flooded it as I was working on it. Ask him if he's drop-starting it. You may also want to go ahead and replace the plug. I have a MS250 that has come up on compression since new. Check for any cracks and damages and replace if necessary. 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. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . Why Does My Chainsaw Have Too Much Compression? A 50CC engine needs 150 PSI compression. Best Professional Chainsaw Reviews 2022 - Pro Tool Reviews Check the saws exterior for loose bolts, nuts, and screws and tighten them with an adjustable wrench or screwdriver. 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. The end of the tester must protrude exact the same volume into the cylinder as the spark plug or the reading will be wrong. 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. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. 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. This site is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. You never try to get it to run with the choke on. "image": { 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. Turn the engine to get under the piston and blow the crankcase out. Stihl chain saw too much compression I had to take it apart Don't know what to do at this point. A clear sign that you may have a chainsaw engine is when you smell gas while starting it. 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. Ensure the chain fits snugly inside of the bar and the teeth that keep it in place are not worn down too low. Any ideas? Also, remove the muffler and check for carbon buildup. 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. Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. Do Chainsaws Overheat? - Common Causes and Their Solutions Make sure the crank taper is clean and the flywheel taper also. "@type": "ImageObject", Usually, this happens when you use a chainsaw after a very long time or by wear and tear of the rope. People sometimes try to cut down a tree that is too big for their chainsaw. Although this is often true, it is not always the case. Would not be afraid to do it to a 4, 6, or V-8. OEM GOOD USED STIHL 048AV CHAINSAW SHORT BLOCK ENGINE 120 PSI COMPRESSION. Has someone invented a new kind of two stroke motor? Blup throttle to bring it down to idle. MS250 compression | Outdoor Power Equipment Forum Stihl 291 chainsaw too much compression Check the compression of the engine. All it needs is a few inches missing and it will pull too hard like the compression is too high. If the starter spring is keep working correctly, it will retract the ignition 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. If the compression is too high or too low, the engine wont start. 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. I would never put water in it! Chainsaw "Hard To Pull" Issues: Check & Fix (Within 5 Min) 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. If the spark plug is too corroded or the electrode is faulty, it cannot create an electrical current to start the system. Block the spark plugs hole by putting a nylon rope to prevent the piston from moving. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . Pour starting fluid into the carburetor and crank the engine several times. "userInteractionCount": 23 The chain oil will keep the chain lubricated, keep off dirt and allow smooth movement. Wipe off the excess fuel from the spark plug with a clean rag. 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. $99.95. Compression gauges are not always accurate and different engines will provide different results. 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! 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. If it does maybe it is plugged. The choke position is the fourth setting on the master control lever. 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. Stihl 024 - Sherlock Holmes issue - help needed here. Runs well, except it. Does the saw have a compression release? Not sure it would accomplish anything on a 2-stroke chain saw engine. Reassemble the chainsaw, refill the fuel tank, crank the engine and check for oil along the bar. Thus far, you have learned how to diagnose most problems with the Stihl chainsaw and how to fix the issues. I would never put water in it! 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. Every chainsaw requires a different compression level according to its built-up and model number. The carburetor is a significant part of the chainsaw. That is what was told to me by the area distributor technician That is the nature of a 250. Garden Guides | Compression Tricks for Chainsaws chain saw compression release mod. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) It's also going to be wise to try to put the chainsaw somewhere that isn't exposed to constant sunlight since that can be a contributing factor to the oxidation. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. This may sometimes jam your chainsaws rings, causing it to become inoperable. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. The key on the flywheel is in place and not sheered. Sounds flooded, or maybe wrong sparkplug? When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. "@type":"DiscussionForumPosting", How Much Compression Should A Chainsaw Have? - Kyle's Garage 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 people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. You can unclog the carburetor if the clog is minor. 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. Below we have discussed the most common reasons why your chainsaw wont idle and the best way to fix it. That is what was told to me by the area distributor technician Check for side play in the crankshaft. Your email address will not be published. MS 260 - Robust chainsaw for forestry work - Stihl As far as compression, you can usually tell by how the saw pulls when starting it. Carboned rings will decrease not increase compression. If the air filter is too clogged, you should replace it. I would suspect the timing is too early. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. My first chain saw was an old Homelite EZ with a blue metal case and a 20" bar. An example of data being processed may be a unique identifier stored in a cookie. Choke cannot be used even when engine cold, or flooding occurs. Guido Quoting Removed, click Modern View to see What?? Currently I live in Austin, United States. It's from not pulling hard enough. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. 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. A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. Use a brush and cloth to clean and remove any dirt, mud, or debris that can interfere with the controlsclean around the chain brake lever, the air filter housing, and the filter. Now, how much compression the engine of a chainsaw needs depends upon its motor capacity and temperature. Every chainsaw needs to have some compression to ensure that it operates well. Cleaned air filters and both were very dirty. I tried draining the crankcase with the saw upside . It may not display this or other websites correctly. Insufficient fuel in the system may result in excessive compression. }, The Pulley compartment plays a massive role in retracting the ignition rope. Most times, when the Stihl chainsaw stops working, it is never a complete breakdown. I bought 2 032 Stihl saws at auction that pulled very hard. 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. I used to have a Homelite that would do that if I left gas in it. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. 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. Can anyone make a suggestion. It runs good after I get it started. Replaced the chain and did some serious cutting and was so pleased. 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. 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. Press J to jump to the feed. Minimum compression for a Stihl 2 cycle | Lawn Mower Forum It would give you rusted bearings. 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 describe all the possible issues and also suggest the solutions to fix them too. There might be a small stone or thing that is stuck inside the starter and causes the rope not to retract. This compression converts fuel (any source) into the potential energy in the engine to start it. of compression. Versions MS 260, Bar length 37cm, RSC By checking & repairing/replacing these, you can fix the issue. If oil is in there it is what makes the engine feel like it is almost locked up. On a 2 stroke the water would go into the crank case first and pool up. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. It is thus highly recommended that you drain the fuel from your chainsaw if it still has any old gasoline left in it. } How Much Compression Should a Chainsaw Have. Dont substitute it with. First, remove the spark plug from the chainsaw. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Friction is usually the cause of a rope failing to draw when it should. An excessive amount of compression in your chainsaws starting rope could also be indicated by the beginning rope failing to draw. And some will have more. I would suspect the timing is too early. Check the chain tension and adjust it if it is too loose or tight. What Causes Too Much Compression on Poulan Chain Saws? Stihl 026 Chainsaw hard to crank - retrofit compression relief valve 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?? Typically, several reasons cause too much compression in a chainsaw and these include but are not limited to: Another common cause of chainsaw compression problems is a faulty quantity of old gasoline. If you buy another battery, make sure it has the same voltage and amperage as the old battery. Finally the fuel will be converted into energy. Always change the spark plug after 100 operating hours of the chainsaw to avoid engine problems. Thank you for the responses. 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. Stihl 064 | Outdoor Power Equipment Forum 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. Then, use a wire brush to remove all the carbon build-up from the cylinder and piston. I've seen a 20psi drop with the wrong type of gauge to be pretty common. 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. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Youll need to clean the cylinder and piston to fix this thoroughly. But it was stolen along with other tools around 1990. You can check the compression by pulling the spark plug out and holding it in your hand. Repair or replace the damaged part 2. "width": 200, I'm an arborist by profession & a blogger by passion. Pull trigger and set full choke. or Best Offer. My one and only MS250 was a kicker to start it but that was the only problem. 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. It is typical for the Stihl chainsaw to develop some issues, and when this happens, some basic troubleshooting will help identify the source of the issue and solution to help it run smoothly. I went with a meteor piston/cylinder set. A drastic and frankly silly thing to do though . { I have a MS250 that has come up on compression since new. Don't know what to do at this point. "@type": "ImageObject", However, you still have to confirm the size of the gap before installing. Its just that its nearly impossible to pull. You need to pull the exhaust to check that. It's also possible the piston or cylinder are scored or carboned up. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Help, can't pull start Stihl MS250 chainsaw, too much compression. Make sure there is oil in the engine. This is bad practice, and can damage your chainsaw. I;ve read somewhere to put water? You can use a ratchet to do the task. I have a MS250 that has come up on compression since new. As long as I can get it going.. It was easier to pull after I cleaned it up, but still tough. You will notice the compression less. That is the nature of a 250. This increased distance will cause the chain to keep coming out of the guiding bar with the vibrating saw. Disengage the chain brake, turn on the ignition switch and install the new spark plug into the rubber connector. Remove the spark plug with a spark plug wrench and clean it with a brush to remove carbon scoring and dirt. Loosen the nuts and bolts clockwise and then pull out the oil pump gently. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. 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. A drastic and frankly silly thing to do though . For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. 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. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. The engine creates a vacuum pressure inside it. Help, can barley pull Stihl MS250, too much compression Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when starting. Change in temperatures and dirt will cause clogging anywhere the oil passes, and this can prevent the oil from spread all across the bar. Why is the Garage Door Opener Light Not Working? 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. i have a ms 250. When the fuel starts to turn stale, it gums up and clogs the carburetor just as it would in an unused lawnmower. 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. You are using an out of date browser. You have an option to either pull off the starter and clean it or look for an ideal replacement for your starter house. In most cases, a buildup of carbon under the rings presses the rings against the cylinder, culminating in compression of the cylinder. Take better care of your chainsaw and perform regular maintenance according to the manufacturers recommendations to prevent any of these problems. MS250 start compression relief stopped working. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. } Fuel filters trap dirt and contaminants from the fuel to prevent them from damaging the engine. My /Sthil 034 is very difficult to start. 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. Also check the air filters and make sure they are clean. The chain clutch might be, Read More Cordless Chainsaw Wont StartContinue, The most common reason is simply the wrong battery. or very unlikely but happened to me on an 041 make sure the crank hasn't shifted and started to bind. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Turn off the choke by pressing the control lever to activate the fast idle. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our. Check the electrode gap of the spark plug and ensure it is 0.02 inches. how much compression should a Stihl 044 have? - TractorByNet 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. It is usual for the chainsaw chains to come off with continued use, but there is usually an underlying cause when its too repetitive. Make sure the keyway is lined up correctly and tighten the nut down good and tight. Check for clogging around the bar oil. So, If you feel too much compression while pulling a chainsaw, the possible reasons might be as below. 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. The Stihl chainsaw is a two-stroke gas-powered tool that uses a substantial amount of compression to pull fuel from the tank, mix it with air and ignite it to produce energy that runs the chainsaw. A chainsaw is going to be exposed to oxidation over time, but you can at least limit the process by storing your chainsaw well. 4 Possible Problems & Solutions Problem 1: Damaged starter housing Solution: 1. I hook up a drill to the nut on the clutch and start hard starting saws that way . 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. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Rinse the filter and allow it to air dry before reinstalling it. Being in the cutting services for more than 10 years, I know a thing or two about chainsaw. You can clean and mildly clogged carburetor but if it is too severe, replace it with one compatible with your chainsaw model. If not I'm honestly kinda stumped. How to Test Stihl 180 Compression CIMFLOK.COM The carburetors work in a chainsaw engine allows the right amount of fuel and air mixture into the combustion chamber. Your ignition rope must be intact properly with the pulley to work correctly. Subsequent starts are just as hard. A drastic and frankly silly thing to do though . 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. The following have been addressed. Fine adjust everything and both saws start Normal now. Does the saw have a compression release? . Use a screw wrench to loosen the nuts on the guide bar side panel to give you room to adjust the chain. Stihl MS250 too much compression - Arborist, Chainsaw & Tree Work Forum 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. As the starter, spring plays a vital role in running starter assembly smoothly. Check the chainsaws fuel if you have not used the tool for a while. Replace the spark plug with a new identical. Try blowing the crankcase out with air. "name": "Egbinor" First thing I'd check is the pull start assy. I would never put water in it! Would not be afraid to do it to a 4, 6, or V-8. Stihl ms 291 hard to pull start? Here's How to Fix It Quickly Pull the rope until it starts. "@type": "WebPage", Don't put water into the 2 stroke. The consent submitted will only be used for data processing originating from this website. "@id":"https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=toolt&th=435118", Continue with Recommended Cookies. "interactionType": "https://schema.org/CommentAction", If the chainsaw is too little compression, it may start easily but will not run smoothly. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. Even with new spark plugs in, incorrectly removing and installing the spark plugs can prevent the engine from starting.

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