We will explain the causes of high compression and how you can quickly fix it to make it run smoothly. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. Remove the right side cover, bar, and chain. I wouldn't go messing with the carb expecting to cure the issue unless you have obvious signs of flooding when trying to start. Try it, it may just do the trick! Your chainsaws compressive strength is measured with the use of a screw-in gauge. To clean it, drain the fuel, spray some carburetor cleaner and loosen the residue with a small brush. Once youve done that, reassemble the chainsaw, which should work properly again. 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. Check the chain tension and adjust it if it is too loose or tight. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. 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. If it does maybe it is plugged. You will notice the compression less. By getting your pool ready for the winter, you can make sure it will be ready to use in the spring. "@type": "Organization", Starter fluids spray can help in those conditions Before pulling shoulder. Compression gauges are not always accurate and different engines will provide different results. after that I'd be looking at crank bearings. Also check the air filters and make sure they are clean. That is a high compression saw, pull the rope slowly until you feel resistance then give it a short quick pull. or Best . You can check the compression by pulling the spark plug out and holding it in your hand. It would give you rusted bearings. Also take the spark plug out and do the same. I;ve read somewhere to put water? The other reason might be the use of the wrong type of oil for the climate. I tried draining the crankcase with the saw upside . Get it ported and it brings it to another level. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. Use recommedend chain oil lubricant. First, remove the cylinder and piston from the chainsaw. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. Carbon buildup is yet another important factor in the increasing compression experienced by chain saws over time. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. You're familiar with how to start a stihl yes? 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. Fine adjust everything and both saws start Normal now. Confirm the spark plug gap, check and adjust with a feeler gauge or gaping tool. 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! It was easier to pull after I cleaned it up, but still tough. Recognised as a leading saw in the forestry industry, it is available in guide bar lengths 13"/32cm to 18"/45cm. Remove the entire carburetor and clean it. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. So, replacing the ignition rope is a better option to keep everything working smoothly without any damage. 24" is what I've got on mine, but it can handle a bigger bar. I think you'll like it. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) Even though it was purchased "brand new" I'm not so sure. 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. Pull the rope until it starts. 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. There is no carbon build up and all looks like new. Pull the starter rope until you hear the first sign of it firing with a small burp. If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. If you do not replace the starter spring on time, it will cause you to replace the whole starter assembly. Blup throttle to bring it down to idle. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. The Stihl 066 chainsaw uses the same type of engine most gasoline-powered yard tools use, a two-cycle combustion engine. 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. Are you sure the starter rope isn't a little too short? After all these operations are carried out, it is necessary to once again clean the saw from dirt, then turn it upside down and unscrew the four screws securing the engine to the chainsaw body. The excess gas can be cleared simply by removing the plug and operating the starter a few times. of compression. The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull. Could your gauge be off a little? It's also possible the piston or cylinder are scored or carboned up. 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! My /Sthil 034 is very difficult to start. Stihl MS290 MS390 MS310 Chainsaw Has Oil Tank Engine Housing Assembly OEM/ Bin G . Each chainsaw has a different level of compression. Sometimes an adapter is needed to make a tight fit. Sounds flooded, or maybe wrong sparkplug? He checked.it clearly says that in the OP. Sometimes, the ignition rope is frayed or stuck inside the starter housing. Just wondering what your opinions are of the lowest compression you can run a Stihl MS250 at. Subsequent starts are just as hard. Cleaned air filters and both were very dirty. Being in the cutting services for more than 10 years, I know a thing or two about chainsaw. It very often kicks back and pulls the starter rope back in. 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. I've done it to high hour Kohler engines many times. Locate the spark plug from the top of the engine underneath the chain brake handle. It takes a Bosch WSR6F or NGK BPMR7A. I would suspect the timing is too early. NelsGarage.com All Rights Reserved 2021 Theme: Prefer by, Stihl Chainsaw Troubleshooting & How-to Guide. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. So be sure to keep your chainsaw properly maintained and avoid compression problems. In addition, you should check the muffler and piston while youre at this point. Check the choke of the chainsaws engine and make sure it is completely closed. Make sure the keyway is lined up correctly and tighten the nut down good and tight. I hook up a drill to the nut on the clutch and start hard starting saws that way . Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. Also, remove the muffler and check for carbon buildup. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Disconnect the spark plug from the engine and inspect if it is damaged, eroded, or dirty. "text": "My chainsaw has gotten very hard to pull the rope. Also try removing the spark plug and see how pull starter works, just trying to see if it could be binding in the recoil/starter assy or not. I got it going. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. 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. Fine adjust everything and both saws start Normal now. Hello. Cleaned air filters and both were very dirty. All it needs is a few inches missing and it will pull too hard like the compression is too high. 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?? About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. Make sure the crank taper is clean and the flywheel taper also. For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. Pull the starter rope and look for a blue spark between the electrode of the spark plug. Usually, this happens when you use a chainsaw after a very long time or by wear and tear of the rope. "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. All it needs is a few inches missing and it will pull too hard like the compression is too high. When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. Every chainsaw engine has a different capacity depending upon its motor power. If it does maybe it is plugged. 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. Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? Carboned rings will decrease not increase compression. water will not dissolve carbon; it is far too hard to be effected. I'm hearing thats just the nature of the beast. Below are the reasons the chain keeps coming loose and how to fix it. Try blowing the crankcase out with air. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Then, use a wire brush to remove all the carbon build-up from the cylinder and piston. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. }, 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. $799.99 CHOOSE AN OPTION Deliver From Store e.g., 123 Your Street, Virginia Beach, VA 12345 Add to Cart Order Online - Pick Up In Store Currently Shopping At: JC Licht Ace Hardware-Bridgeport (773) 523-8888 Change My dealer Features STIHL M-Tronic Replace the spark plug with a new identical. 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. If there is any damage to the pulley at any stage, it will cause High Compression or stiffness during a pull.. Replace with a new starter house Problem 2: Damaged pulley system Solution: 1. Flooding usually happens due to an underlying issue: a bad spark plug, bad gas, or a faulty carburetor. pulls with little resistance, similar to my farm boss. . Pull trigger and set full choke. It is thus highly recommended that you drain the fuel from your chainsaw if it still has any old gasoline left in it. If this does not fix the issue, it may be necessary to replace the whole starting rope system with another one. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. If you regularly use the chainsaw, then there might be the possibility that your starter spring breaks off. Additionally, most spark plugs come pre-gapped. 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.. Now it has sat since the last use and I went to start it and it turned over maybe three times and the compression . Temperature Of The Engine A heavy-duty engine gets hot faster and works better than a cold engine. I would suggest clearing the cylinder by pulling the rope with the plug out. 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. 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. 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. Turn the idle speed clockwise until the saw idles and chain turns, and then make a one-fourth counterclockwise turn. If the chainsaw is too much compression, it may be difficult to start. The excess gas can be cleared simply by removing the plug and operating the starter a few times. Cleaned air filters and both were very dirty. Low pressure, 20 to 30 pounds is all you need. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. If oil is in there it is what makes the engine feel like it is almost locked up. The carburetors work in a chainsaw engine allows the right amount of fuel and air mixture into the combustion chamber. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. JavaScript is disabled. If your saw doesn't have a compression release since like you say its not a pro, then the two things I would check is either the go through recoil assembley with a fine tooth comb. Didnt somehow get straight oil in the cylinder did you? "@type": "WebPage", 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. Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when starting. JavaScript is disabled. 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. Rinse the filter and allow it to air dry before reinstalling it. 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. Compression is measured by using a simple screw-in gauge. Keep in mind that good maintenance and storage will reduce breakdowns and maintain your tools performance throughout its lifetime. 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. If cleaning does not help release oil onto the bar, the pump may be damaged and require replacing. Required fields are marked *. 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. 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. I've done it to high hour Kohler engines many times. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. 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. "description":"Discussion of Chainsaw has too much compression in the Tool Talk forum followed by comments. 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. Now, how much compression the engine of a chainsaw needs depends upon its motor capacity and temperature. Soaking in water will do nothing but rust things up . Pull the rope until it starts. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. "@type": "Person", When there is no air for the spark to ignite, the chainsaw will start and then die after a short while. Take off the muffler or the carb to get access. 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. Choke cannot be used even when engine cold, or flooding occurs. What ratio mix is he using? Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. To ensure correct functioning and to prevent excessive compression, you might have to repair worn-out parts with new ones. Without proper compression, the engine will not be able to suck and use the fuel for combustion. This is because each machine is made differently and has various needs. When there is too much fuel, it will not ignite, and the engine wont start. If you buy another battery, make sure it has the same voltage and amperage as the old battery. Repair or replace the damaged part 2. 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. The consent submitted will only be used for data processing originating from this website. chain saw compression release mod. What are the numbers on your sparkplug? The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. Does the saw have a compression release? 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. The plug should be tight against your thumb. My first chain saw was an old Homelite EZ with a blue metal case and a 20" bar. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. The second thing, Read More Stihl Chainsaw Charger Not WorkingContinue, Your email address will not be published. Ron Cook. Lift the bars nose and tighten the nuts on the sidebar to secure the sidebar and guide bar in place. I've seen a 20psi drop with the wrong type of gauge to be pretty common. John Deere and its logos are the registered trademarks of the John Deere Corporation. Reddit and its partners use cookies and similar technologies to provide you with a better experience. A lot of variables might contribute to excessive compression while using a chainsaw. Typically, several reasons cause too much compression in a chainsaw and these include but are not limited to: Old contaminated chainsaw fuel Chainsaw Starter rope issues Faulty spark plugs Chainsaw Carbon buildup Insufficient Chainsaw Oil Old and contaminated fuel The purpose of a choke in a chainsaw is to make cold starting more effortless, but if you do not use it properly. Final step: removing the old spark plug and installing the new one. Hope this helps. I was given (estate) a small McCulloch chain saw and it started and ran great. "@type": "InteractionCounter", 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. Quoting Removed, click Modern View to see Don't put water in the saw-ever. By checking & repairing/replacing these, you can fix the issue. A heavy-duty engine gets hot faster and works better than a cold engine. I used to have a Homelite that would do that if I left gas in it. Free shipping. Would have to remove spark plug and rinse cylinder with gas to be able to start. Has someone invented a new kind of two stroke motor? "dateModified": "2017-08-17", A clogged carburetor wont allow fuel into the engine, preventing it from starting. You are misunderstanding WHY water is put into carboned up engines. Quoting Removed, click Modern View to see Don't put water in the saw-ever. 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. Thanks! High compression in chainsaws is a dangerous problem that can lead to serious injuries. Are you sure the starter rope isn't a little too short? I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. You should also make sure the new gas you use is appropriate for the chainsaw. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder.