Is the spark plug the correct one for the saw? 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. Once youve done that, reassemble the chainsaw, which should work properly again. The exhaust is black but no build up. 24" is what I've got on mine, but it can handle a bigger bar. I've done it to high hour Kohler engines many times. Turn off the choke by pressing the control lever to activate the fast idle. What are the numbers on your sparkplug? 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! Thanks. As long as I can get it going.. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. But it was stolen along with other tools around 1990. The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. Your ignition rope must be intact properly with the pulley to work correctly. The end of the tester must protrude exact the same volume into the cylinder as the spark plug or the reading will be wrong. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. "@type": "Organization", It would give you rusted bearings. First thing I'd check is the pull start assy. I have a MS250 that has come up on compression since new. Quoting Removed, click Modern View to see What?? 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 a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. Also check the air filters and make sure they are clean. I would suggest clearing the cylinder by pulling the rope with the plug out. On a 2 stroke the water would go into the crank case first and pool up. 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. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. However, you still have to confirm the size of the gap before installing. Do that to the starter side when you're looking at the starter assy. Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? lol. Insufficient fuel in the system may result in excessive compression. The saw runs and starts great. 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. Choke cannot be used even when engine cold, or flooding occurs. "publisher": { The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Wear rubber gloves and hold the rubber plug and spark plug about 1-2cm from the metal surface of the engine unit. Low pressure, 20 to 30 pounds is all you need. Remove the right side cover, bar, and chain. Generally covering everything under 25 HP. Sounds flooded, or maybe wrong sparkplug? Start new topic; Recommended Posts. If you regularly use the chainsaw, then there might be the possibility that your starter spring breaks off. If A two cycle engine gets flooded BADLY, oil can separate from the gas mix, accumulate in the crankcase and creates an hydrostatc lock. Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when starting. Hope this helps. Then Google "decarb". Each chainsaw has a different level of compression. }, Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) Oct 24, 2011 / Chainsaw excessive compression #1 . Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. When there is too much fuel, it will not ignite, and the engine wont start. Remove the entire carburetor and clean it. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. Sometimes an adapter is needed to make a tight fit. I think you'll like it. Every chainsaw requires a different compression level according to its built-up and model number. My question is what is causing the trigger to not slow down. runs way too fast. Does the saw have a compression release? "@type": "ImageObject", I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Even though it was purchased "brand new" I'm not so sure. This article will help you fix the most commonly reported problems of a Stihl chainsaw. You can unclog the carburetor if the clog is minor. Winterize Your Pool Like a Pro: A Comprehensive Guide for Home owners. OEM GOOD USED STIHL 048AV CHAINSAW SHORT BLOCK ENGINE 120 PSI COMPRESSION. You may also notice that the chain saw loses power during operation. Would not be afraid to do it to a 4, 6, or V-8. JavaScript is disabled. What worked with my MS440 kicking problem should also work with that one. A 50CC engine needs 150 PSI compression. Being in the cutting services for more than 10 years, I know a thing or two about chainsaw. Advanced arborist chainsaw with a top handle and STIHL M-Tronic technology. There might be a small stone or thing that is stuck inside the starter and causes the rope not to retract. 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. Then Google decarb . Repair or replace the damaged part 2. The plug should be tight against your thumb. Im Nelson, a DIY enthusiast with a bottomless can-do attitude. It is significantly tougher to pull over than an 024 or the new 241. Make sure the gap is according to the specifications of your chainsaws engine. High compression in chainsaws is a dangerous problem that can lead to serious injuries. 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?? A clear sign that you may have a chainsaw engine is when you smell gas while starting it. If oil is in there it is what makes the engine feel like it is almost locked up. Turn the engine to get under the piston and blow the crankcase out. I bought 2 032 Stihl saws at auction that pulled very hard. If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. The excess gas can be cleared simply by removing the plug and operating the starter a few times. If there is any damage to the pulley at any stage, it will cause High Compression or stiffness during a pull.. Free shipping. Then Google decarb . As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. You will notice the compression less. If it does maybe it is plugged. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. It is best to put a new plug in after clearing. 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. 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. Are you sure the starter rope isn't a little too short? If repeated cleaning does not fully unclog the carburetor, you will have to replace it. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. No compression when pulling start rope. The owner is complaining of hard to pull start. 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. 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. If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Its just that its nearly impossible to pull. 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. 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. This is because your oil is not rated to get to work at a low temperature. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. Loosen the nuts and bolts clockwise and then pull out the oil pump gently. Sometimes, this might be triggered by another problem that is impacting your system. John Deere and its logos are the registered trademarks of the John Deere Corporation. 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. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Can also be used with hedge trimmer attachment HS 246. Any ideas? Follow the steps below on how to fix a flooded chainsaw engine. Also take the spark plug out and do the same. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. It was easier to pull after I cleaned it up, but still tough. Move the selector lever up one position immediately or the saw will flood on the very next pull. 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. If you do not replace the starter spring on time, it will cause you to replace the whole starter assembly. 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. in the cylinder overnight because the rings are cerboned up? Chainsaw Parts. Just wondering what your opinions are of the lowest compression you can run a Stihl MS250 at. Maybe the piston is hitting it. How big a fella are ya? Similarly, a 4-stroke engine needs 2 times more compression than a 2-stroke engine, around 180-210 PSI. Consequently, operating this chainsaw becomes a really difficult chore to do. 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. Keep in mind that good maintenance and storage will reduce breakdowns and maintain your tools performance throughout its lifetime. 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! Pull the rope until it starts. "userInteractionCount": 23 Versions MS 260, Bar length 37cm, RSC Starting fluid will make the fuel more combustible and makes the process of clearing out the combustion chamber much quicker. The saw runs and starts great. A drastic and frankly silly thing to do though . } ", Sometimes the spring stops working correctly due to overuse and becomes brittle. }, Posted December 27, 2017. A chainsaw Battery blinking red is one of the most frustrating things a woodcutter can, Read More How To Fix Chainsaw Battery Charger Blinking Red?Continue, The standard compression reading required for most 2-cycle chainsaw is around 100-110 psi to start. (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 On a 2 stroke the water would go into the crank case first and pool up. ProTip: You can use a small air compressor to blow air through the air filter and get rid of the loose dust before proceeding to clean it further. It works when cold-starting the engine, when the engine is idle and when the engine is open. Stihl chainsaw compression test Joe_Power Jun 2, 2015 Not open for further replies. 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. $75.00. Register today and take advantage of membership benefits. I usual only choke my MS250 for one pull and no longer have the flooding issue. 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. Other than damaged parts, using the choke position to start a warm saw often causes a flooded engine. Pull the rope until it starts. 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. To clean it, drain the fuel, spray some carburetor cleaner and loosen the residue with a small brush. I think that's what I'd do. Why is the Garage Door Opener Light Not Working? in the, All Rights Reserved. My first chain saw was an old Homelite EZ with a blue metal case and a 20" bar. Also check the air filters and make sure they are clean. Poke the oil feed hole with a 16-gauge wire to unclog it until it slides through the hole smoothly. 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. Check the electrode gap of the spark plug and ensure it is 0.02 inches. It's also possible the piston or cylinder are scored or carboned up. Use recommedend chain oil lubricant. If you see any unusual movement of spring, then take it in to replace it. Stihl oil has been used. 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. 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. You can follow the steps on how to troubleshoot and revive it when it wont start. NelsGarage.com All Rights Reserved 2021 Theme: Prefer by, Stihl Chainsaw Troubleshooting & How-to Guide. . Check the spark plug of the chain saw if the engine is not starting at all. The starter assembly often fails to rotate due to a weak connection between the pulley and the ignition rope. Below we have discussed the most common reasons why your chainsaw wont idle and the best way to fix it. The chain oil will keep the chain lubricated, keep off dirt and allow smooth movement. 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. I think that's what I'd do. Our aftermarket suitable replacement Stihl MS 250 C chainsaw compression release parts meet or beat OEM specs, offer a considerable cost savings, and usually ship in 24 - 48 hours. Sparkplug was correct but I think it was a little flooded. Over time or when using the wrong fuel, the fuel filter becomes too clogged and restricts fuel flow, killing the engine shortly after starting. Make sure it fits snug. i have a ms 250. It's also possible the piston or cylinder are scored or carboned up. water will not dissolve carbon; it is far too hard to be effected. The first step is to remove the cover that covers the spark plug on your chainsaw. If not I'm honestly kinda stumped. Not sure it would accomplish anything on a 2-stroke chain saw engine. A clogged carburetor wont allow fuel into the engine, preventing it from starting. water will not dissolve carbon; it is far too hard to be effected. It is possible however to flood a two stroke which can cause the plug to fowl. For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. Suitable Replacement Stihl MS 250 C Compression Release Parts We and our partners use cookies to Store and/or access information on a device. A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. You need to pull the exhaust to check that. I've got four other Stihl saws here, an 029, 036Pro, 015L, and an MS200T, only the 36Pro pulls this hard and only if I don't use the decomp button. Block the spark plugs hole by putting a nylon rope to prevent the piston from moving. If it has damaged parts, replace it with a carburetor kit that fits your chainsaw model. Here is a link for two stroke engine air cycle. Make sure it's greased and the bushings are good. Try taking it out, Then holding the trigger while you pull fast. You can check the compression by pulling the spark plug out and holding it in your hand. I love to write about chainsaw for homeowners and professionals. 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. Carbon buildup is yet another important factor in the increasing compression experienced by chain saws over time. If you suspect a compression issue, seek professional help as compression repairs can be complicated. It runs good after I get it started. You can use a ratchet to do the task. Remove ignition coil and muffler. Of all the Stihl saws, the MS250 is the toughest to start in relation to it's size. 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. Has someone invented a new kind of two stroke motor? Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. My /Sthil 034 is very difficult to start. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", Create an account to follow your favorite communities and start taking part in conversations. I have a MS250 that has come up on compression since new. Quoting Removed, click Modern View to see Don't put water in the saw-ever. I used to have a Homelite that would do that if I left gas in it. 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. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. water will not dissolve carbon; it is far too hard to be effected. If the rails are shallow, you need to replace them. It runs good after I get it started. Would not be afraid to do it to a 4, 6, or V-8. Get you some Sea Foam at the local auto parts store. Stihl MS 250 Chain Saw: The pull start will barely move the flywheel. Locate the tension adjustment screws to the side of the chainsaw guide bar. "@type": "InteractionCounter", 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. "@type":"DiscussionForumPosting", Stihl recommends using 89 octane gasoline without ethanol, and the gas should not contain more than 10% ethanol. That is what was told to me by the area distributor technician. 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. after that I'd be looking at crank bearings. You can clean and mildly clogged carburetor but if it is too severe, replace it with one compatible with your chainsaw model. 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. The spark arrestor in a chainsaw traps exhaust products emitted from an internal combustion engine. "dateModified": "2017-08-17", I missed the "no carbon". Usually, this happens when you use a chainsaw after a very long time or by wear and tear of the rope. The carburetor is a significant part of the chainsaw. 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. Fine adjust everything and both saws start Normal now. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. I have plenty of engines with REALLY low compression that I'll be glad to swap him. When the engine starts running, turn the choke off. I would suspect the timing is too early.

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