If it has to do with small engines, it's welcome here. I;ve read somewhere to put water? I thought all the fuel was out but there was some in the line yet. If it is the right sparkplug and not flooded, I would maybe buy a different saw with easy start. read more Vince O. "name": "Yesterday's Tractor Co.", Soaking in water will do nothing but rust things up . There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Pull the starter rope until you hear the first sign of it firing with a small burp. In most cases, a buildup of carbon under the rings presses the rings against the cylinder, culminating in compression of the cylinder. Would have to remove spark plug and rinse cylinder with gas to be able to start. It is significantly tougher to pull over than an 024 or the new 241. The plug should be tight against your thumb. Can anyone make a suggestion. 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. Try it, it may just do the trick! Try it, it may just do the trick! Any chance is it hydro locking because of gas? 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. The ignition system is responsible for igniting the fuel and air mixture to produce energy that powers the chainsaw. Sometimes the spring stops working correctly due to overuse and becomes brittle. I hook up a drill to the nut on the clutch and start hard starting saws that way . When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. As far as compression, you can usually tell by how the saw pulls when starting it. As the guide bar wears down with use, the bar heel- the part of the bar nearest to the drive sprocket- also wears down, which increases the distance the chain travels as the bar grooves become less effective. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. The saw feels good in my hands and its got a surprising amount of power. Get it ported and it brings it to another level. Is the spark plug the correct one for the saw? (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 The recoil starter in a chainsaw is a start mechanism that allows you to pull the rope. If it is too damaged, you should replace it. I bought 2 032 Stihl saws at auction that pulled very hard. Make sure you have a replacement spark plug on hand in case the problem recurs in the future. Disengage the chain brake, turn on the ignition switch and install the new spark plug into the rubber connector. I;ve read somewhere to put water? "datePublished": "2017-08-17", Versions MS 260, Bar length 37cm, RSC Yeah, I must have flooded it as I was working on it. The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull. Obviously, the motor, which has a huge capacity, will require more compression. It is harmful to your machine to use old fuel. Check for side play in the crankshaft. Free shipping. 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. Maybe the piston is hitting it. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. All it needs is a few inches missing and it will pull too hard like the compression is too high. My one and only MS250 was a kicker to start it but that was the only problem. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Rinse the filter and allow it to air dry before reinstalling it. Pull the starter rope until you hear the first sign of it firing with a small burp. I used to have a Homelite that would do that if I left gas in it. 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. You're familiar with how to start a stihl yes? When the engine starts running, turn the choke off. }, Guido Quoting Removed, click Modern View to see What?? You will notice the compression less. Mar 24, 2019. I tried draining the crankcase with the saw upside . To test the recoil starter, remove it and reposition the spring. }, We have explained the most effective way to unflood a chainsaw engine below. A chainsaw with no spark will shut down suddenly or not start at all. "@type": "ImageObject", Each chainsaw has a different level of compression. in the cylinder overnight because the rings are cerboned up? First thing I'd check is the pull start assy. I think that's what I'd do. If you still have questions regarding high chainsaw compression, you can discuss them in the comments. If oil is in there it is what makes the engine feel like it is almost locked up. If the spark plug is working correctly and you have good fuel, there still has to be enough fuel in the combustion chamber for the engine to start correctly. Below are the reasons the chain keeps coming loose and how to fix it. Take better care of your chainsaw and perform regular maintenance according to the manufacturers recommendations to prevent any of these problems. If any of these components are worn or broken, the chain saw wont start even with fuel. That would have to be some puddle of oil for a MS250 to have a "bar oil leaking in and causing high compression problems" What kind of Stihl oil regular or synthitc, had an 025 years ago that was a real knuckel buster never checked compression but was using regular Stihl oil. That is the nature of a 250. Recognised as a leading saw in the forestry industry, it is available in guide bar lengths 13"/32cm to 18"/45cm. MS250 start compression relief stopped working. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. Additionally, most spark plugs come pre-gapped. That is what was told to me by the area distributor technician That is the nature of a 250. Temperature Of The Engine A heavy-duty engine gets hot faster and works better than a cold engine. "@type": "InteractionCounter", So, in our suggestion, one of the first things to check while feeling high compression is the starter spring. Make sure the keyway is lined up correctly and tighten the nut down good and tight. Reassemble the chainsaw, refill the fuel tank, crank the engine and check for oil along the bar. If it does maybe it is plugged. I hope you understand the problems why your chainsaw is hard to pull. Carboned rings will decrease not increase compression. Sometimes an adapter is needed to make a tight fit. SPONSORED. Stihl MS290 MS390 MS310 Chainsaw Has Oil Tank Engine Housing Assembly OEM/ Bin G . Unscrew the clutch assembly on top of the oil pump. 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": "Person", Pour starting fluid into the carburetor and crank the engine several times. Move the selector lever up one position immediately or the saw will flood on the very next pull. If the chainsaw is too much compression, it may be difficult to start. Continue with Recommended Cookies. Even with new spark plugs in, incorrectly removing and installing the spark plugs can prevent the engine from starting. 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. It takes a Bosch WSR6F or NGK BPMR7A. Once youve done that, reassemble the chainsaw, which should work properly again. $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 If there is any damage to the pulley at any stage, it will cause High Compression or stiffness during a pull.. When you are doing a cold start, push the choke lever to the warm start when the engine starts to run. 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. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. Pull the rope until it starts. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. When there is no air for the spark to ignite, the chainsaw will start and then die after a short while. 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. anthonyg_ma Original Author 16 years ago Canguy, thnks for the tips! I used to have a Homelite that would do that if I left gas in it. The Pulley compartment plays a massive role in retracting the ignition rope. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. Check the spark plug of the chain saw if the engine is not starting at all. Check the spark plug and replace it if needed. The following have been addressed. I can probably find one with at most 65 PSI. Small Engine Technician That is what was told to me by the area distributor technician. Final step: removing the old spark plug and installing the new one. 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. This compression converts fuel (any source) into the potential energy in the engine to start it. By getting your pool ready for the winter, you can make sure it will be ready to use in the spring. You are misunderstanding WHY water is put into carboned up engines. However, if I push downward on the trigger button, it slows down to. 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. Also, remove the muffler and check for carbon buildup. The Stihl 066 chainsaw uses the same type of engine most gasoline-powered yard tools use, a two-cycle combustion engine. I've done it to high hour Kohler engines many times. After that, using a ratchet, remove the spark plug from the engine. Why is the Garage Door Opener Light Not Working? Try blowing the crankcase out with air. Winterize Your Pool Like a Pro: A Comprehensive Guide for Home owners. To clean it, drain the fuel, spray some carburetor cleaner and loosen the residue with a small brush. I would never put water in it! Then Google decarb . Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. It was metering lever. Reddit and its partners use cookies and similar technologies to provide you with a better experience. A clear sign that you may have a chainsaw engine is when you smell gas while starting it. Try it, it may just do the trick! Flooding usually happens due to an underlying issue: a bad spark plug, bad gas, or a faulty carburetor. You will notice the compression less. 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. after that I'd be looking at crank bearings. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. On a 2 stroke the water would go into the crank case first and pool up. A lot of variables might contribute to excessive compression while using a chainsaw. Does the saw have a compression release? Winterizing a pool is an important step in maintaining the longevity and health of your pool. Make sure there is oil in the engine. Some of the contributing reasons include a full tank of oil, carbon buildup on the exhaust system, and malfunctioning spark plugs. Confirm the spark plug gap, check and adjust with a feeler gauge or gaping tool. I've seen a 20psi drop with the wrong type of gauge to be pretty common. Check for any cracks and damages and replace if necessary. It is effortless to check the starter spring; pull the ignition rope. or Best . Sometimes, the ignition rope is frayed or stuck inside the starter housing. Make sure it's greased and the bushings are good. Indoor fly traps are an effective way to keep insects away from your home. I've done it to high hour Kohler engines many times. You can clean and mildly clogged carburetor but if it is too severe, replace it with one compatible with your chainsaw model. I would suggest clearing the cylinder by pulling the rope with the plug out. Register today and take advantage of membership benefits. 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. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. }. Press J to jump to the feed. I agree the saw runs great, but when your helping old men with ideas of their own its hard to say I wish I had 190 pounds of compression. I'm hearing thats just the nature of the beast. Do that to the starter side when you're looking at the starter assy. lol. If the reading is below or above the required range, then your ignition coil requires changing. You may also want to go ahead and replace the plug. Cleaned air filters and both were very dirty. If that doesnt work, try gently tapping on the side of the bulb with a screwdriver or other tool. 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. A cold engine will need the compression of 50-100 PSI whereas a hot engine will require compression above 150 PSI. I have plenty of engines with REALLY low compression that I'll be glad to swap him. Thanks. Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. Therefore, it does not need any compression rate to start. Check the electrode gap of the spark plug and ensure it is 0.02 inches. Several reasons can cause your Stihl chainsaw to bog down when your pull the trigger. Therefore, most people will wonder why the chainsaw has too much compression. If the issue persists after the addition of new fuel to the tank, there may be a fault with the gas pipelines or the fuel filters. Blup throttle to bring it down to idle. 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. Finally the fuel will be converted into energy. 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. It is possible however to flood a two stroke which can cause the plug to fowl. A compression gauge is used to measure the compression of a chainsaw which works similarly to the tire gauge. A two-stroke gas-powered chainsaw uses relatively few moving parts. Then, use a wire brush to remove all the carbon build-up from the cylinder and piston. It will be apparent if it is, but usually a scored saw won't run good, if at all. When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. Sounds like it was broken in "right", show the guy how to start it and tell him to be happy. 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. If that is true, I'd suspect that the timing is off and why it's ripping the cord from your hand. My name is Chris Ross. It is usual for the chainsaw chains to come off with continued use, but there is usually an underlying cause when its too repetitive. chain saw compression release mod. Wipe off the excess fuel from the spark plug with a clean rag. The compression limit should also be doubled if the engine capacity is 100 CC. I went with a meteor piston/cylinder set. Repair or replace the damaged part 2. Generally the minimum is 110 lbs. This is because each machine is made differently and has various needs. Manage Settings It is possible however to flood a two stroke which can cause the plug to fowl. On a 2 stroke the water would go into the crank case first and pool up. 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. Wear rubber gloves and hold the rubber plug and spark plug about 1-2cm from the metal surface of the engine unit. Stihl MS192T Chainsaw Fuel Oil Tank Engine Housing Assembly OEM. Most fuels nowadays are a blend of ethanol which attracts moisture and speeds up the rotting process. Stihl 291 chainsaw too much compression Check the compression of the engine. Even though it was purchased "brand new" I'm not so sure. 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 have a MS250 that has come up on compression since new. If it does maybe it is plugged. I'll even do the labor for free. Fine adjust everything and both saws start Normal now. I was given (estate) a small McCulloch chain saw and it started and ran great. ", I think that's what I'd do. water will not dissolve carbon; it is far too hard to be effected. Low pressure, 20 to 30 pounds is all you need. Has someone invented a new kind of two stroke motor? Choke cannot be used even when engine cold, or flooding occurs. John Deere and its logos are the registered trademarks of the John Deere Corporation. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. Turn the engine to get under the piston and blow the crankcase out. You can unclog the carburetor if the clog is minor. 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. Fine adjust everything and both saws start Normal now. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Also take the spark plug out and do the same. Keep in mind that the stuck ignition rope can also damaged other parts inside the starter assembly. "@id":"https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=toolt&th=435118", Turn the engine to get under the piston and blow the crankcase out. 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. Find the low speed, high speed, and idle speed screws near the carburetor, start the engine and allow it to warm up. After initial pull on rope (which feels like vapor lock on cylinder), saw will start on second or third pull. Now, how much compression the engine of a chainsaw needs depends upon its motor capacity and temperature. This is bad practice, and can damage your chainsaw. Don't know what to do at this point. Low pressure, 20 to 30 pounds is all you need. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. My first chain saw was an old Homelite EZ with a blue metal case and a 20" bar. "name": "Egbinor" Remove The Chainsaw's Spark Plug Set The Pressure Test Gauge Tug On The Chainsaw's Starter Rope Reset The Chainsaw's Spark Plug Do The Thumb Test Remove The Spark Plug Place Your Thumb Over The Hole Tug On Your Chainsaw's Starter Rope Problems Caused By Too Little Or Too Much Compression Low pressure in a chainsaw High compression in a chainsaw Any ideas? Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. Fuel filters trap dirt and contaminants from the fuel to prevent them from damaging the engine. The switch might be damaged or the motor is burned out. Also take the spark plug out and do the same. If the starter spring is keep working correctly, it will retract the ignition rope. 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. However, this will vary by model and compression readings alone are not enough to determine the condition 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. The saw runs and starts great. I would never put water in it! 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. runs way too fast. Carboned rings will decrease not increase compression. You can follow the steps on how to troubleshoot and revive it when it wont start. no, afraid I don't have equipment to test. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Any ideas? Check if the wires are damaged or broken and replace them if necessary. The consent submitted will only be used for data processing originating from this website. Not sure it would accomplish anything on a 2-stroke chain saw engine. 24" is what I've got on mine, but it can handle a bigger bar. First thing I'd check is the pull start assy. Here is how to troubleshoot a malfunctioning spark plug. What ratio mix is he using? A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. in the. That is the nature of a 250. Most times, when the Stihl chainsaw stops working, it is never a complete breakdown. To inspect the guide bar, disassemble the chain cover, chain and bar. 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. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. #1. You can check the compression by pulling the spark plug out and holding it in your hand. 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 Indoor Fly Traps: 5 Things You Didn't Know About Indoor Fly Traps. Pull the rope until it starts. "interactionType": "https://schema.org/CommentAction", A hot engine also requires more compression to convert furl into energy as compared to the colder one. NelsGarage will share the knowledge Ive gathered about different tools and give you tips to accomplish your DIY projects faster. Just wondering what your opinions are of the lowest compression you can run a Stihl MS250 at. 4 Possible Problems & Solutions Problem 1: Damaged starter housing Solution: 1.