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You can check the compression by pulling the spark plug out and holding it in your hand. On a 2 stroke the water would go into the crank case first and pool up. How Much Does it Cost to Install a Garage Door Opener? Hold the tip of the blade and adjust the tension of the chain correctly. Stihl chainsaw low compression diagnoses and How To - YouTube of compression. My first chain saw was an old Homelite EZ with a blue metal case and a 20" bar. The saw runs and starts great. You are using an out of date browser. If it is not physically damaged, clean it with clean gasoline and a rag. 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're familiar with how to start a stihl yes? 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. That is the nature of a 250. It prevents the carburetor from allowing too much fuel into the combustion chamber. I'm an arborist by profession & a blogger by passion. Doesnt pull at all or just hard to pull. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . The carburetor is a significant part of the chainsaw. The vibration of the tool during use can run some fasteners loose, preventing it from starting again. Carboned rings will decrease not increase compression. It is thus highly recommended that you drain the fuel from your chainsaw if it still has any old gasoline left in it. Are you sure the starter rope isn't a little too short? "@type": "WebPage", Back to top derwen1959 Long Time User How Much Compression Should a Stihl 066 Have? - SFGATE I used to have a Homelite that would do that if I left gas in it. Also, remove the muffler and check for carbon buildup. Any help out thereEGBinOR Get you some Sea Foam at the local auto parts store. A large engine has a huge capacity in its motor. You will notice the compression less. Stihl 064 | Outdoor Power Equipment Forum I have a MS250 that has come up on compression since new. Remove the filter, engine control lever and Stihl carburetor. A faulty spark plug will have carbon, dirt, and oil blocking the insulator nose, preventing it from firing consistently. I would never put water in it! If you find the brake drum moving, you must replace the needle bearing. To inspect the guide bar, disassemble the chain cover, chain and bar. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. A two-stroke gas-powered chainsaw uses relatively few moving parts. You can also quickly fix this anomaly by ensuring a proper troubleshooting of the pulley compartment to find damages. If the chainsaw is too much compression, it may be difficult to start. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. { With the choke engaged, pull the starting rope several times again, and the chain saw should start on the third pull. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", I tried draining the crankcase with the saw upside . Would not be afraid to do it to a 4, 6, or V-8. 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! 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. For a better experience, please enable JavaScript in your browser before proceeding. You can follow the steps on how to troubleshoot and revive it when it wont start. That model is extremely easy to flood. I think that's what happened, although I didn't think such a small amount could do it. Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. or very unlikely but happened to me on an 041 make sure the crank hasn't shifted and started to bind. Not sure it would accomplish anything on a 2-stroke chain saw engine. } There might be a small stone or thing that is stuck inside the starter and causes the rope not to retract. I would suspect the timing is too early. Soaking in water will do nothing but rust things up . Disengage the chain brake, turn on the ignition switch and install the new spark plug into the rubber connector. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. How Much Compression Should A Chainsaw Have? - Kyle's Garage The other reason might be the use of the wrong type of oil for the climate. Not sure it would accomplish anything on a 2-stroke chain saw 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. It will be apparent if it is, but usually a scored saw won't run good, if at all. The owner is complaining of hard to pull start. It takes a Bosch WSR6F or NGK BPMR7A. Detailed, well-researched, and accurate home and garden information presented in an understandable format is our primary goal. The excess gas can be cleared simply by removing the plug and operating the starter a few times. 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. Stihl oil has been used. A drastic and frankly silly thing to do though . 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. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. If the chainsaw is too much compression, it may be difficult to start. 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. or Best Offer. How big a fella are ya? Sometimes the spring stops working correctly due to overuse and becomes brittle. Stihl MS250 too much compression - Arborist, Chainsaw & Tree Work Forum Turn the engine to get under the piston and blow the crankcase out. You can clean and mildly clogged carburetor but if it is too severe, replace it with one compatible with your chainsaw model. Cleaned it all up, and had it tuned up. 1. saw has new carb 2. flywheel has been removed and key inspected. MS250 start compression relief stopped working. stihl ms290 farm boss; By Ron Cook December 27, 2017 in General Chat. I hope my epic guides will help you to choose,buy and maintain chainsaw. That is what was told to me by the area distributor technician Check for side play in the crankshaft. 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. My question is what is causing the trigger to not slow down. Low pressure, 20 to 30 pounds is all you need. 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. Your email address will not be published. Don't know what to do at this point. I used to have a Homelite that would do that if I left gas in it. Minimum compression for a Stihl 2 cycle | Lawn Mower Forum Problem starting Stihl 032AV chainsaw - Houzz 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. Are you sure the starter rope isn't a little too short? 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. how much compression should a Stihl 044 have? - TractorByNet Just wondering what your opinions are of the lowest compression you can run a Stihl MS250 at. Temperature Of The Engine A heavy-duty engine gets hot faster and works better than a cold engine. Stihl MS290 Hard to pull recoil | Hearth.com Forums Home 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. 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. Does the saw have a compression release? As the starter, spring plays a vital role in running starter assembly smoothly. For a better experience, please enable JavaScript in your browser before proceeding. We got rid of both of those useless things . "description":"Discussion of Chainsaw has too much compression in the Tool Talk forum followed by comments. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. 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. Tighten the tension screw with a screwdriver to tighten the chain around the bar. If it is too damaged, you should replace it. I've been working on a Stihl 026 chainsaw that John found, and it is very hard to crank. read more Vince O. Lift the bars nose and tighten the nuts on the sidebar to secure the sidebar and guide bar in place. Compression is measured by using a simple screw-in gauge. When the fuel starts to turn stale, it gums up and clogs the carburetor just as it would in an unused lawnmower. In other words, the problem is in the trigger itself, not a. carb adjustment screw. A 50CC engine needs 150 PSI compression. Check the spark plug of the chain saw if the engine is not starting at all. Also take the spark plug out and do the same. If the starter spring is keep working correctly, it will retract the ignition rope. 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. A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. 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?? Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. Reassemble the chainsaw, refill the fuel tank, crank the engine and check for oil along the bar. Don't know what to do at this point. Any chance is it hydro locking because of gas? If the air filter is too clogged, you should replace it. Remove the right side cover, bar, and chain. Soaking in water will do nothing but rust things up . 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. The purpose of a choke in a chainsaw is to make cold starting more effortless, but if you do not use it properly. However, you still have to confirm the size of the gap before installing. The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. . Can also be used with hedge trimmer attachment HS 246. To ensure correct functioning and to prevent excessive compression, you might have to repair worn-out parts with new ones. To test the recoil starter, remove it and reposition the spring. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. 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! If it has to do with small engines, it's welcome here. 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. Rinse the filter and allow it to air dry before reinstalling it. $49.99. If oil is in there it is what makes the engine feel like it is almost locked up. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Use a screw wrench to loosen the nuts on the guide bar side panel to give you room to adjust the chain. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. I would never put water in it! link to Winterize Your Pool Like a Pro: A Comprehensive Guide for Home owners. 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 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. Turn the engine to get under the piston and blow the crankcase out. idle. Pull the starter rope until you hear the first sign of it firing with a small burp. If it has damaged parts, replace it with a carburetor kit that fits your chainsaw model. The key on the flywheel is in place and not sheered. Most fuels nowadays are a blend of ethanol which attracts moisture and speeds up the rotting process. We describe all the possible issues and also suggest the solutions to fix them too. I usual only choke my MS250 for one pull and no longer have the flooding issue. Hope this helps. I've done it to high hour Kohler engines many times. Register today and take advantage of membership benefits. Indoor fly traps are an effective way to keep insects away from your home. 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 is possible however to flood a two stroke which can cause the plug to fowl. MS 260 - Robust chainsaw for forestry work - Stihl I bought it used around 1978. If you suspect a compression issue, seek professional help as compression repairs can be complicated. 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! Subsequent starts are just as hard. A chainsaw with no spark will shut down suddenly or not start at all. When there is too much fuel, it will not ignite, and the engine wont start. The spark plug is located in the engine and ignites the fuel and air mixture, driving the piston and running the engine. I wouldn't go messing with the carb expecting to cure the issue unless you have obvious signs of flooding when trying to start. We have explained the most effective way to unflood a chainsaw engine below. Try blowing the crankcase out with air. water will not dissolve carbon; it is far too hard to be effected. He checked.it clearly says that in the OP. It would give you rusted bearings. 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. Normally it's not a problem but if it was already difficult to pull it could be. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Suitable Replacement Stihl MS 250 C Compression Release Parts Move the selector lever up one position immediately or the saw will flood on the very next pull. I think that's what I'd do. Take better care of your chainsaw and perform regular maintenance according to the manufacturers recommendations to prevent any of these problems. Fine adjust everything and both saws start Normal now. "author": { anthonyg_ma Original Author 16 years ago Canguy, thnks for the tips! Would have to remove spark plug and rinse cylinder with gas to be able to start. }, I think you'll like it. If that doesnt work, try gently tapping on the side of the bulb with a screwdriver or other tool. 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. Hello. "height": 57 A cold engine will need the compression of 50-100 PSI whereas a hot engine will require compression above 150 PSI. Your chainsaws compressive strength is measured with the use of a screw-in gauge. "name": "Egbinor" 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. Too much carbon will do that, check the piston top and combustion chamber. You can check the compression by pulling the spark plug out and holding it in your hand. If repeated cleaning does not fully unclog the carburetor, you will have to replace it. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. Check for broken teeth on the chain and replace them if necessary. "mainEntityOfPage": { When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. Flooding usually happens due to an underlying issue: a bad spark plug, bad gas, or a faulty carburetor. It is best to put a new plug in after clearing. Pull trigger and set full choke. Each chainsaw has a different level of compression. How Much Compression Should A Chainsaw Have - Toolsadvisorpro Consequently, always use the right oil and make sure that your chain saws starting mechanism is lubricated to prevent excessive compression while starting the saw. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. A smaller gap will cause a weak spark and poor ignition of the engine, while a wider gap will not bring out any spark. Pull trigger and set full choke. Use a can of carb cleaner sprayed into the breather/filter assembly. You need to pull the exhaust to check that. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Turn the engine to get under the piston and blow the crankcase out. "@type":"DiscussionForumPosting", Press question mark to learn the rest of the keyboard shortcuts. Thanks. 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. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. Uninstall the spark arrestor and unblock it using a brush, but you can also replace it for efficiency. It may not display this or other websites correctly. Save my name, email, and website in this browser for the next time I comment.