Also take the spark plug out and do the same. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. The flywheel is loose? Advanced arborist chainsaw with a top handle and STIHL M-Tronic technology. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. Im Nelson, a DIY enthusiast with a bottomless can-do attitude. You will notice the compression less. 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. Youre familiar with how to start a stihl yes? 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 compression is not produced in the engine at an appropriate level, it will not be able to convert fuel into energy. Turn the brake off. It is effortless to check the starter spring; pull the ignition rope. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. Could your gauge be off a little? If the chainsaw wont stay running when the engine is idle, adjust the carburetor. no, afraid I don't have equipment to test. what and or where is the metering lever.? A smaller gap will cause a weak spark and poor ignition of the engine, while a wider gap will not bring out any spark. "@type": "Person", High compression in chainsaws is a dangerous problem that can lead to serious injuries. Stihl 251 chainsaw. 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 uncoils, tightens the spring, engages the clutch to start the engine. Dont substitute it with. Usually, this happens when you use a chainsaw after a very long time or by wear and tear of the rope. read more Vince O. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. NelsGarage.com All Rights Reserved 2021 Theme: Prefer by, Stihl Chainsaw Troubleshooting & How-to Guide. The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull. (there is some play when flywheel on shaft (nut not attached) 3. tank and oiler vents are operating 4. exhaust has been removed and spark arresting screen checked (clean) 5. piston/walls checked.. no scarring Welcome! Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? Any ideas? It will be apparent if it is, but usually a scored saw won't run good, if at all. Not sure it would accomplish anything on a 2-stroke chain saw engine. My first chain saw was an old Homelite EZ with a blue metal case and a 20" bar. sthil 034 hard to pull the cord in Chainsaws - The Forestry Forum Check the saws exterior for loose bolts, nuts, and screws and tighten them with an adjustable wrench or screwdriver. 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. Pull the recoil off and check for binding Pull rope or starter pawls misaligned. 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. 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. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. If it is hard to pull, then check how the spring is performing. Check the choke of the chainsaws engine and make sure it is completely closed. After that, using a ratchet, remove the spark plug from the engine. A drastic and frankly silly thing to do though . If it has to do with small engines, it's welcome here. I used to have a Homelite that would do that if I left gas in it. For a better experience, please enable JavaScript in your browser before proceeding. The first step is to remove the cover that covers the spark plug on your chainsaw. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. Keep in mind that good maintenance and storage will reduce breakdowns and maintain your tools performance throughout its lifetime. You may also want to go ahead and replace the plug. How big a fella are ya? Soaking in water will do nothing but rust things up . 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. You need to pull the exhaust to check that. Carboned rings will decrease not increase compression. Guido Quoting Removed, click Modern View to see What?? It may not display this or other websites correctly. Obviously, the motor, which has a huge capacity, will require more compression. If this is the case, you may want to try lubricating the rope to see if it would assist to resolve the difficulties. let it idle over lunch, just made sure to not go too long between filling it with gas, while running of course. I;ve read somewhere to put water? If you still have questions regarding high chainsaw compression, you can discuss them in the comments. Has someone invented a new kind of two stroke motor? Clean any mildly dirty parts and replace all the damaged parts. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) Cleaned air filters and both were very dirty. $49.99. 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?? 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. The compression limit should also be doubled if the engine capacity is 100 CC. It runs good after I get it started. Check the chainsaws fuel if you have not used the tool for a while. Wear rubber gloves and hold the rubber plug and spark plug about 1-2cm from the metal surface of the engine unit. 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. 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. Carboned rings will decrease not increase compression. 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. I have a MS250 that has come up on compression since new. I've done it to high hour Kohler engines many times. Insufficient fuel in the system may result in excessive compression. Stihl 064 | Outdoor Power Equipment Forum Remove the spark plug with a spark plug wrench and clean it with a brush to remove carbon scoring and dirt. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. 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. 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. Low pressure, 20 to 30 pounds is all you need. Remove the air filter, wash it with detergent and water and scrub off the dirt with a brush. It works when cold-starting the engine, when the engine is idle and when the engine is open. Stihl MS250 Too High of Compression? - Arborist, Chainsaw & Tree Work Forum A cold engine will need the compression of 50-100 PSI whereas a hot engine will require compression above 150 PSI. 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. To test the recoil starter, remove it and reposition the spring. Ask him if he's drop-starting it. If that is true, I'd suspect that the timing is off and why it's ripping the cord from your hand. You can follow the steps on how to troubleshoot and revive it when it wont start. Thank you for the responses. $20.00 shipping. When there is too much fuel, it will not ignite, and the engine wont start. It is like there is too much compression. That is what was told to me by the area distributor technician. Make sure the gap is according to the specifications of your chainsaws engine. Step 1: Prepare the chainsaw Remove the spark plug from the chainsaw. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. As the starter, spring plays a vital role in running starter assembly smoothly. If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. 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. Sparkplug was correct but I think it was a little flooded. On a 2 stroke the water would go into the crank case first and pool up. Thanks! Try it, it may just do the trick! I get it going now and its easier but its still a bear. This may sometimes jam your chainsaws rings, causing it to become inoperable. I think you'll like it. You never try to get it to run with the choke on. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Check for clogging around the bar oil. I have a MS250 that has come up on compression since new. I would never put water in it! Quoting Removed, click Modern View to see What?? Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. It prevents the carburetor from allowing too much fuel into the combustion chamber. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. 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. Modern View Forum powered by phpBB 2001, 2005 phpBB Group. Do Chainsaws Overheat? - Common Causes and Their Solutions Press question mark to learn the rest of the keyboard shortcuts. You will notice the compression less. I got it started. When you start the chainsaw, it triggers the worm drive to engage the oiler to send oil through a port that releases onto the bar. "height": 57 The purpose of a choke in a chainsaw is to make cold starting more effortless, but if you do not use it properly. Hello. No carbon on top or on roof of cylinder. Wipe off any dirt and debris and check for any signs of damages. Sometimes the spring stops working correctly due to overuse and becomes brittle. Also check the air filters and make sure they are clean. Sometimes, this might be triggered by another problem that is impacting your system. Why Is My Chainsaw Hard to Pull? (5 Things to Check) The vibration of the tool during use can run some fasteners loose, preventing it from starting again. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. A drastic and frankly silly thing to do though . That is what was told to me by the area distributor technician Check for side play in the crankshaft. I would never put water in it! Finally the fuel will be converted into energy. A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. If oil is in there it is what makes the engine feel like it is almost locked up. I used to have a Homelite that would do that if I left gas in it. My name is Chris Ross. If I drop start it I can pull it through 1 compression stroke. "mainEntityOfPage": { What are the numbers on your sparkplug? We are compensated for referring traffic and business to Amazon and other companies linked to on this site. The consent submitted will only be used for data processing originating from this website. Reassemble the chainsaw, refill the fuel tank, crank the engine and check for oil along the bar. Animated Two Stoke Engine Air Cycle, My husky 266xp has been that away from newjust pull over slow for 2 or 3 times and then try cranking.. My husky 266xp has been that away from newjust pull over slow for 2 or 3 times and then try cranking.. Soaking in water will do nothing but rust things up . Chainsaw has too much compression - Tool Talk Forum Make sure it's greased and the bushings are good. Check the chain oiler and ensure it is functional. Do that to the starter side when you're looking at the starter assy. Make sure there is oil in the engine. I used to have a Homelite that would do that if I left gas in it. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. All it needs is a few inches missing and it will pull too hard like the compression is too high. Normally it's not a problem but if it was already difficult to pull it could be. Stihl chain saw too much compression I had to take it apart 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. "description":"Discussion of Chainsaw has too much compression in the Tool Talk forum followed by comments. runs way too fast. Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. When the air that reaches the chain saw's engine is insufficient, it becomes prone to overheating. All it needs is a few inches missing and it will pull too hard like the compression is too high. The Pulley compartment plays a massive role in retracting the ignition rope. When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. "width": 200, Why is the Garage Door Opener Light Not Working? Suitable Replacement Stihl MS 250 C Compression Release Parts That model is extremely easy to flood. Take off the muffler or the carb to get access. Even with new spark plugs in, incorrectly removing and installing the spark plugs can prevent the engine from starting. Gas with ethanol also burns hotter than gasoline which can cause the engine to overheat and burn the plug electrodes. When the spark plug is removed, the engine turns Ask an Expert Car Questions Small Engine Troubleshooting JON, Small Engine Technician 2,680 Satisfied Customers Certified Small Engine Technician JON is online now Related Small Engine Questions "logo": { or very unlikely but happened to me on an 041 make sure the crank hasn't shifted and started to bind. That is the nature of a 250. I think that's what I'd do. Try taking it out, Then holding the trigger while you pull fast. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. 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. This is because your oil is not rated to get to work at a low temperature. Admitted Woodaholic. How Much Compression Should A Chainsaw Have? - Kyle's Garage I would suspect the timing is too early. For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. Runs well, except it. "width": 200, Garden Guides | Compression Tricks for Chainsaws Repair or replace the damaged part 2. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. Once youve done that, reassemble the chainsaw, which should work properly again. You can use a ratchet to do the task. I've done it to high hour Kohler engines many times. This is because each machine is made differently and has various needs. 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. "@type": "ImageObject", Minimum compression for a Stihl 2 cycle | Lawn Mower Forum NelsGarage will share the knowledge Ive gathered about different tools and give you tips to accomplish your DIY projects faster. Make sure you have a replacement spark plug on hand in case the problem recurs in the future. Stihl 024 - Sherlock Holmes issue - help needed here. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. Pull the starter rope until you hear the first sign of it firing with a small burp. Here is how to troubleshoot a malfunctioning spark plug. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. It is, therefore, necessary to determine if the problem has been remedied by adding fresh fuel. I would never put water in it! It does not take much to increase the compression. What is the minimum compression for my STIHL chainsaw? The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. Read More Chainsaw Primer Bulb Temporary FixContinue, Pull out your battery from the chainsaw, and press the battery button sustainably for a minimum of 5 seconds before you release it. Check for broken teeth on the chain and replace them if necessary. You have an option to either pull off the starter and clean it or look for an ideal replacement for your starter house. No compression when pulling start rope read more Expert Stihl ms 180 chain saw, new carb, spark plug, compression stihl ms 180 chain saw, new carb, spark plug, compression 110, new gas, still won't start what next, piston is not scored. Stihl 291 chainsaw too much compression Check the compression of the engine. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. Get it ported and it brings it to another level. Back to top derwen1959 Long Time User Chainsaws are very powerful tools, and if theyre not properly maintained, they can easily overcompress the chain, which can cause it to break. Recognised as a leading saw in the forestry industry, it is available in guide bar lengths 13"/32cm to 18"/45cm. Stihl chainsaw compression test Joe_Power Jun 2, 2015 Not open for further replies. The ignition system is responsible for igniting the fuel and air mixture to produce energy that powers the chainsaw. 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. 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. Stihl is a leading manufacturer of chainsaws and other handheld outdoor and landscaping power tools.