Use an adjustable wrench to loosen the two nuts on both sides of the chainsaw. Does the saw have a compression release? How Much Compression Should a Chainsaw Have. I thought all the fuel was out but there was some in the line yet. You can clean and mildly clogged carburetor but if it is too severe, replace it with one compatible with your chainsaw model. Replaced the chain and did some serious cutting and was so pleased. We are compensated for referring traffic and business to Amazon and other companies linked to on this site. An excessive amount of compression in your chainsaws starting rope could also be indicated by the beginning rope failing to draw. Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. 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. Doesnt pull at all or just hard to pull. I can probably find one with at most 65 PSI. Uninstall the spark arrestor and unblock it using a brush, but you can also replace it for efficiency. Wash the dirty filter with a non-abrasive detergent and water. If any of these components are worn or broken, the chain saw wont start even with fuel. Blup throttle to bring it down to idle. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. After that, using a ratchet, remove the spark plug from the engine. after that I'd be looking at crank bearings. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . If you recently refueled your Stihl chainsaw, stale gas can be a reason why it wont start. You will notice the compression less. This increased distance will cause the chain to keep coming out of the guiding bar with the vibrating saw. I;ve read somewhere to put water? Not sure it would accomplish anything on a 2-stroke chain saw engine. So, replacing the ignition rope is a better option to keep everything working smoothly without any damage. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. in the, All Rights Reserved. You are misunderstanding WHY water is put into carboned up engines. or very unlikely but happened to me on an 041 make sure the crank hasn't shifted and started to bind. Poke the oil feed hole with a 16-gauge wire to unclog it until it slides through the hole smoothly. If this is the case, you may want to try lubricating the rope to see if it would assist to resolve the difficulties. ", A hot engine also requires more compression to convert furl into energy as compared to the colder one. idle. Remove the air filter, wash it with detergent and water and scrub off the dirt with a brush. 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. Make sure there is oil in the engine. Wipe off any dirt and debris and check for any signs of damages. "@type":"DiscussionForumPosting", It would give you rusted bearings. I luv my 064. Sometimes an adapter is needed to make a tight fit. Check the tension 2. In most cases, a buildup of carbon under the rings presses the rings against the cylinder, culminating in compression of the cylinder. The choke position is the fourth setting on the master control lever. Mar 24, 2019. in the. If you still have questions regarding high chainsaw compression, you can discuss them in the comments. Reddit and its partners use cookies and similar technologies to provide you with a better experience. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. Thus far, you have learned how to diagnose most problems with the Stihl chainsaw and how to fix the issues. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. 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. Use of this Web site constitutes acceptance of our. If the chainsaw is too much compression, it may be difficult to start. How Many Amps Does a Garage Door Opener Use? Free shipping. Manage Settings Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. A smaller gap will cause a weak spark and poor ignition of the engine, while a wider gap will not bring out any spark. If you experience low compression, pull the muffler and check the piston and cylinder for, Read More How Much Compression Should a Chainsaw HaveContinue, The possible reasons can be the battery not being charged, properly connected, or dead. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. If cleaning does not help release oil onto the bar, the pump may be damaged and require replacing. Below are the reasons the chain keeps coming loose and how to fix it. 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. 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. I think that's what happened, although I didn't think such a small amount could do it. Your email address will not be published. Being in the cutting services for more than 10 years, I know a thing or two about chainsaw. Turn the engine to get under the piston and blow the crankcase out. "@type": "ImageObject", It is thus highly recommended that you drain the fuel from your chainsaw if it still has any old gasoline left in it. 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. lol. The Pulley compartment plays a massive role in retracting the ignition rope. I love to write about chainsaw for homeowners and professionals. "image": { Even with new spark plugs in, incorrectly removing and installing the spark plugs can prevent the engine from starting. "@id":"https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=toolt&th=435118", read more Vince O. The spark plug is located in the engine and ignites the fuel and air mixture, driving the piston and running the engine. The plug should be tight against your thumb. 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. If I drop start it I can pull it through 1 compression stroke. The engine creates a vacuum pressure inside it. Then Google "decarb". Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. 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. If the air filter is too clogged, you should replace it. Block the spark plugs hole by putting a nylon rope to prevent the piston from moving. If it does maybe it is plugged. You may also notice that the chain saw loses power during operation. I;ve read somewhere to put water? It will be apparent if it is, but usually a scored saw won't run good, if at all. 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 Loosen the nuts holding the clutch cover and disconnect the chain shroud and remove the oil plate. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Obviously, the motor, which has a huge capacity, will require more compression. A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips. For a better experience, please enable JavaScript in your browser before proceeding. Pull the starter rope and look for a blue spark between the electrode of the spark plug. If it has to do with small engines, it's welcome here. Stihl oil has been used. Stihl chainsaw compression test Joe_Power Jun 2, 2015 Not open for further replies. Do that to the starter side when you're looking at the starter assy. The following have been addressed. Help, can't pull start Stihl MS250 chainsaw, too much compression. Try blowing the crankcase out with air. JavaScript is disabled. 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. }, Pull trigger and set full choke. Start new topic; Recommended Posts. Dont substitute it with. That is what was told to me by the area distributor technician Check for side play in the crankshaft. 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. If that doesnt work, try gently tapping on the side of the bulb with a screwdriver or other tool. 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. Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. It is like there is too much compression. let it idle over lunch, just made sure to not go too long between filling it with gas, while running of course. If that is true, I'd suspect that the timing is off and why it's ripping the cord from your hand. Unscrew the clutch assembly on top of the oil pump. We will explain the causes of high compression and how you can quickly fix it to make it run smoothly. Unscrew the spark plug using a ratchet and screw the compression gauge in its place. If the chainsaw still wont start, it is defective and requires a replacement. I would never put water in it! "@type": "Person", pulls with little resistance, similar to my farm boss. Pull the rope until it starts. I'm an arborist by profession & a blogger by passion. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. or Best Offer. The ignition system is responsible for igniting the fuel and air mixture to produce energy that powers the chainsaw. 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. 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. I would suggest clearing the cylinder by pulling the rope with the plug out. }, The chain oil will keep the chain lubricated, keep off dirt and allow smooth movement. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. A faulty spark plug will have carbon, dirt, and oil blocking the insulator nose, preventing it from firing consistently. Additionally, most spark plugs come pre-gapped. Check the chain tension and adjust it if it is too loose or tight. Remove the sprocket and the washer. Repair or replace the damaged part 2. Use recommedend chain oil lubricant. Your chainsaws compressive strength is measured with the use of a screw-in gauge. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. Cleaned it all up, and had it tuned up. Soaking in water will do nothing but rust things up . Other than damaged parts, using the choke position to start a warm saw often causes a flooded engine. Temperature Of The Engine A heavy-duty engine gets hot faster and works better than a cold engine. Thanks! Any ideas? Check if the wires are damaged or broken and replace them if necessary. The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. You will notice the compression less. Turn the idle speed clockwise until the saw idles and chain turns, and then make a one-fourth counterclockwise turn. Soaking in water will do nothing but rust things up . Loosen the nuts and bolts clockwise and then pull out the oil pump gently. Pull the rope until it starts. after that I'd be looking at crank bearings. Every chainsaw needs to have some compression to ensure that it operates well. Pull trigger and set full choke. Does the saw have a compression release? You never try to get it to run with the choke on. When there is too much fuel, it will not ignite, and the engine wont start. Convenient, durable and robust with minimum weight, the STIHL MS 260 can come with a number of optional features to make the job even easier. I missed the "no carbon". Don't put water into the 2 stroke. Mar 22, 2017. What usually happens is that the guide bar gets stuck in the tree and they keep running the engine while trying to force the bar out of the tree somehow. It's also possible the piston or cylinder are scored or carboned up. More information can be found on this page. 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. Check for any cracks and damages and replace if necessary. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. I have a MS250 that has come up on compression since new. If you see any unusual movement of spring, then take it in to replace it. I believe it was flooded, but I didn't think that little bit of fuel would make it that hard to pull but I guess so since it can't compress! A drastic and frankly silly thing to do though . If anything prevents the right amount of fuel into the combustion chamber, the chainsaw wont start. On a 2 stroke the water would go into the crank case first and pool up. "@type": "ImageObject", The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. anthonyg_ma Original Author 16 years ago Canguy, thnks for the tips! 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. Locate the tension adjustment screws to the side of the chainsaw guide bar. For a better experience, please enable JavaScript in your browser before proceeding. You need to pull the exhaust to check that. 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. Remove the right side cover, bar, and chain. We and our partners use cookies to Store and/or access information on a device. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . When the air that reaches the chain saw's engine is insufficient, it becomes prone to overheating. It runs good after I get it started. For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. High compression in chainsaws is a dangerous problem that can lead to serious injuries. Once you identify the cause of high compression, you can repair that affected part or find a new replacement for it to make it work smoothly. Create an account to follow your favorite communities and start taking part in conversations. It is a prevalent issue and can be fixed and detected easily without consulting a mechanic. The piston and rings are very shiney. 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. In other words, the problem is in the trigger itself, not a. carb adjustment screw. Consequently, operating this chainsaw becomes a really difficult chore to do. The first step is to remove the cover that covers the spark plug on your chainsaw. The excess gas can be cleared simply by removing the plug and operating the starter a few times. This is bad practice, and can damage your chainsaw. Check for broken teeth on the chain and replace them if necessary. Generally the minimum is 110 lbs. Sometimes, the ignition rope is frayed or stuck inside the starter housing. All it needs is a few inches missing and it will pull too hard like the compression is too high. 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. Usually, this happens when you use a chainsaw after a very long time or by wear and tear of the rope. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. { Subsequent starts are just as hard. Take off the muffler or the carb to get access. Sounds like it was broken in "right", show the guy how to start it and tell him to be happy. Modern View Forum powered by phpBB 2001, 2005 phpBB Group. Soaking in water will do nothing but rust things up . Make sure it's greased and the bushings are good. I would suspect the timing is too early. JavaScript is disabled. I've done it to high hour Kohler engines many times. Remove the filter, engine control lever and Stihl carburetor. Would not be afraid to do it to a 4, 6, or V-8. The Stihl chainsaw uses a four-position lever ignition system called the master control lever. "@context":"https://schema.org", There are sprays (power tune) for removing carbon, but I doubt if that's your problem. 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. Any ideas? As long as I can get it going.. Use a can of carb cleaner sprayed into the breather/filter assembly. A 50CC engine needs 150 PSI compression. I've seen a 20psi drop with the wrong type of gauge to be pretty common. Hold the tip of the blade and adjust the tension of the chain correctly. Press question mark to learn the rest of the keyboard shortcuts. If repeated cleaning does not fully unclog the carburetor, you will have to replace it. A clear sign that you may have a chainsaw engine is when you smell gas while starting it. Runs well, except it. NelsGarage will share the knowledge Ive gathered about different tools and give you tips to accomplish your DIY projects faster. Therefore, most people will wonder why the chainsaw has too much compression. Sometimes it kicks and the rope pulls right out of my hand. Winterize Your Pool Like a Pro: A Comprehensive Guide for Home owners. Compression is measured by using a simple screw-in gauge. Final step: removing the old spark plug and installing the new one. Recognised as a leading saw in the forestry industry, it is available in guide bar lengths 13"/32cm to 18"/45cm. On a 2 stroke the water would go into the crank case first and pool up. When this pressure, or compression, is too low or high, the chainsaw . Of all the Stihl saws, the MS250 is the toughest to start in relation to it's size.
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