Choke cannot be used even when engine cold, or flooding occurs. Step 1: Prepare the chainsaw Remove the spark plug from the chainsaw. It's also possible the piston or cylinder are scored or carboned up. Quoting Removed, click Modern View to see Don't put water in the saw-ever. If there is any damage to the pulley at any stage, it will cause High Compression or stiffness during a pull.. Check the tension 2. The correct tension of the chainsaw chain should be slightly loose on the guide bar but tight enough that you cant pull the drive links out of the bar to fix the chain tension issues; follow the steps below. 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. When the motor warms up after about a minute, turn on the choke position. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. A two-stroke gas-powered chainsaw uses relatively few moving parts. That is what was told to me by the area distributor technician. First, remove the cylinder and piston from the chainsaw. And some will have more. Pull the rope until it starts. Replace the fuel filters instead of cleaning them as they are pretty affordable and easy to install too. I used to have a Homelite that would do that if I left gas in it. When it comes to power tools, good maintenance, and proper use will maintain the functionality and lifespan of the tool regardless of whether it is an electric miter saw or a gas power 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. Check for side play in the crankshaft. 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. Other than damaged parts, using the choke position to start a warm saw often causes a flooded engine. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. 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. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. All it needs is a few inches missing and it will pull too hard like the compression is too high. I would suspect the timing is too early. 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 spark arrestor in a chainsaw traps exhaust products emitted from an internal combustion engine. That is the nature of a 250. In addition, you should check the muffler and piston while youre at this point. I have a MS250 that has come up on compression since new. $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 "@type": "ImageObject", It will be apparent if it is, but usually a scored saw won't run good, if at all. Sounds flooded, or maybe wrong sparkplug? 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. I've done it to high hour Kohler engines many times. That is what was told to me by the area distributor technician That is the nature of a 250. 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. Even though it was purchased "brand new" I'm not so sure. Turn the idle speed clockwise until the saw idles and chain turns, and then make a one-fourth counterclockwise turn. Hello. Starter fluids spray can help in those conditions Before pulling shoulder. I'm an arborist by profession & a blogger by passion. I was given (estate) a small McCulloch chain saw and it started and ran great. Ron Cook. or Best Offer. If the coil is faulty, there will be no spark to start the engine and run the chainsaw. Move the selector lever up one position immediately or the saw will flood on the very next pull. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. We're all about fixing small engines, from carburetor rebuilds, to crankshaft machining. 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 Follow the steps below on how to fix a flooded chainsaw engine. My /Sthil 034 is very difficult to start. Also check the air filters and make sure they are clean. My first chain saw was an old Homelite EZ with a blue metal case and a 20" bar. The Stihl 066 chainsaw uses the same type of engine most gasoline-powered yard tools use, a two-cycle combustion engine. Small Engine Technician "dateModified": "2017-08-17", I have plenty of engines with REALLY low compression that I'll be glad to swap him. The plug should be tight against your thumb. Pull the starter rope and look for a blue spark between the electrode of the spark plug. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. The other reason might be the use of the wrong type of oil for the climate. We describe all the possible issues and also suggest the solutions to fix them too. Then Google decarb . idle. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. "interactionType": "https://schema.org/CommentAction", 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. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. When the engine starts running, turn the choke off. The Stihl chainsaw comes with a sturdy body, strong teeth, and a smooth rotating bar to help you cut through trees, ice, and even concrete with ease and precision. $20.00 shipping. 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. Would have to remove spark plug and rinse cylinder with gas to be able to start. It's supposed to warm up later this week so I'll be able to do some more on this chain saw. I bought 2 032 Stihl saws at auction that pulled very hard. 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! You can prevent the new starter rope from fraying by burning the two ends of the rope. Use a can of carb cleaner sprayed into the breather/filter assembly. Pull the starter rope until you hear the first sign of it firing with a small burp. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. Make sure there is oil in the engine. When the air that reaches the chain saw's engine is insufficient, it becomes prone to overheating. 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. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. "name": "Egbinor" after that I'd be looking at crank bearings. I think that's what happened, although I didn't think such a small amount could do it. Please use the navigational links to explore our website. 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. Blup throttle to bring it down to idle. It may not display this or other websites correctly. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. 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. Doesnt pull at all or just hard to pull. Youre familiar with how to start a stihl yes? "@type": "ImageObject", However, you still have to confirm the size of the gap before installing. Press J to jump to the feed. 3 9 9 comments Best Add a Comment Revolutionary-Act469 2 yr. ago Doesn't pull at all or just hard to pull. My name is Chris Ross. You may also want to go ahead and replace the plug. Locate the tension adjustment screws to the side of the chainsaw guide bar. Press J to jump to the feed. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. 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. Most times, when the Stihl chainsaw stops working, it is never a complete breakdown. Stihl MS192T Chainsaw Fuel Oil Tank Engine Housing Assembly OEM. It is best to put a new plug in after clearing. By getting your pool ready for the winter, you can make sure it will be ready to use in the spring. 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. However, these moving parts, to stay moving, require a substantial amount of compression. Loosen the nuts holding the clutch cover and disconnect the chain shroud and remove the oil plate. You can follow the steps on how to troubleshoot and revive it when it wont start. Stihl MS290 MS390 MS310 Chainsaw Has Oil Tank Engine Housing Assembly OEM/ Bin G . It had a compression release, and it started and ran well. Pour starting fluid into the carburetor and crank the engine several times. "interactionStatistic": { John Deere and its logos are the registered trademarks of the John Deere Corporation. stihl ms290 farm boss; By Ron Cook December 27, 2017 in General Chat. A clear sign that you may have a chainsaw engine is when you smell gas while starting it. Several reasons can cause your Stihl chainsaw to bog down when your pull the trigger. A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. I have a MS250 that has come up on compression since new. It runs good after I get it started. Back to top derwen1959 Long Time User 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! link to Winterize Your Pool Like a Pro: A Comprehensive Guide for Home owners. A lot of variables might contribute to excessive compression while using a chainsaw. 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. Sometimes, this might be triggered by another problem that is impacting your system. We have explained the most effective way to unflood a chainsaw engine below. For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. Disengage the chain brake, turn on the ignition switch and install the new spark plug into the rubber connector. The carburetor is a significant part of the chainsaw. 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. } "mainEntityOfPage": { Cylinder Compression Plug Applicable Model For STIHL 021, 023, 024, 025, 026, 044, 046, 066, MS210, MS230, MS240, MS250, MS260, MS341, MS360, MS440, MS460, MS650, MS660 Chainsaw Parts Refer To Part No. Hope this helps. A highly compressed engine will not be able to work smoothly because of the too much pressure on engine and you will find it hard to start the engine. runs way too fast. It is a prevalent issue and can be fixed and detected easily without consulting a mechanic. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", Press question mark to learn the rest of the keyboard shortcuts. Carbon build-up in cylinder & piston, bad needle bearing, overused starter spring, oil in the starter system, old or bad fuel, etc can cause too much compression in Chainsaws. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. A 250 has a fair amount of compression for a smaller saw but not that bad. Don't put water into the 2 stroke. Get it ported and it brings it to another level. 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. If that doesnt work, try gently tapping on the side of the bulb with a screwdriver or other tool. 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?? Oct 24, 2011 / Chainsaw excessive compression #1 . If oil is in there it is what makes the engine feel like it is almost locked up. Ron Cook. Then Google decarb . How To Fix Chainsaw Battery Charger Blinking Red? Stihl oil has been used. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. after that I'd be looking at crank bearings. A drastic and frankly silly thing to do though . As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. If it has damaged parts, replace it with a carburetor kit that fits your chainsaw model. If the compression is too high or too low, the engine wont start. Has someone invented a new kind of two stroke motor? 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. 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. It takes a Bosch WSR6F or NGK BPMR7A. I have a MS250 that has come up on compression since new. 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. Use a screw wrench to loosen the nuts on the guide bar side panel to give you room to adjust the chain. Fuel filters trap dirt and contaminants from the fuel to prevent them from damaging the engine. Below are the reasons the chain keeps coming loose and how to fix it. . I usual only choke my MS250 for one pull and no longer have the flooding issue. Turn the engine to get under the piston and blow the crankcase out. Use recommedend chain oil lubricant. Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. Remove the spark plug with a spark plug wrench and clean it with a brush to remove carbon scoring and dirt. Cleaned air filters and both were very dirty. Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when starting. The piston and rings are very shiney. There might be a small stone or thing that is stuck inside the starter and causes the rope not to retract. everything is harder in a tree, not a conclusive test. pulls with little resistance, similar to my farm boss. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. 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. Take off the muffler or the carb to get access. If it is not physically damaged, clean it with clean gasoline and a rag. Any ideas? If a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. But it was stolen along with other tools around 1990. SPONSORED. 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. More information can be found on this page. Compression is measured by using a simple screw-in gauge. Obviously, the motor, which has a huge capacity, will require more compression. Soaking in water will do nothing but rust things up . I'll even do the labor for free. As long as I can get it going.. Ensure the chain fits snugly inside of the bar and the teeth that keep it in place are not worn down too low. 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. If you suspect a compression issue, seek professional help as compression repairs can be complicated. Make sure it's greased and the bushings are good. I've done it to high hour Kohler engines many times. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. Stihl 291 chainsaw too much compression Check the compression of the engine. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. If this does not fix the issue, it may be necessary to replace the whole starting rope system with another one. A smaller gap will cause a weak spark and poor ignition of the engine, while a wider gap will not bring out any spark. "name": "Yesterday's Tractor Co.", 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. 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. lol. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. You should also make sure the new gas you use is appropriate for the chainsaw. The recoil starter in a chainsaw is a start mechanism that allows you to pull the rope. If you are trying to start your chainsaw in winter and the oil you used for the chainsaw assembly is not suitable for the winter season, you also feel high compression. In a similar vein, if the wrong kind of oil is used, the compression may be increased.