If there is any damage to the pulley at any stage, it will cause High Compression or stiffness during a pull.. Carboned rings will decrease not increase compression. OEM GOOD USED STIHL 048AV CHAINSAW SHORT BLOCK ENGINE 120 PSI COMPRESSION. If you suspect a compression issue, seek professional help as compression repairs can be complicated. Of all the Stihl saws, the MS250 is the toughest to start in relation to it's size. Soaking in water will do nothing but rust things up . I have a MS250 that has come up on compression since new. In this case fixing or repairing is required or worst replacing the engine all at once. If A two cycle engine gets flooded BADLY, oil can separate from the gas mix, accumulate in the crankcase and creates an hydrostatc lock. When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. 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. "@type": "Person", When you start your chainsaw, the crankshaft spins, creating vacuum pressure on the carburetor, pulling the gas from the tank and into the combustion chamber where it mixes with air and ignites. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. No compression when pulling start rope. Activate the chain brake and then place the chainsaw on a flat, leveled surface. If you do not replace the starter spring on time, it will cause you to replace the whole starter assembly. i have a ms 250. It is harmful to your machine to use old fuel. Also check the air filters and make sure they are clean. In a similar vein, if the wrong kind of oil is used, the compression may be increased. Other than damaged parts, using the choke position to start a warm saw often causes a flooded engine. 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 would never put water in it! When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. You will notice the compression less. $99.95. 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. Finally the fuel will be converted into energy. If this is the case, you may want to try lubricating the rope to see if it would assist to resolve the difficulties. Block the spark plugs hole by putting a nylon rope to prevent the piston from moving. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Don't put water into the 2 stroke. I tried draining the crankcase with the saw upside . Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. 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. } Pull trigger and set full choke. Carboned rings will decrease not increase compression. Does the saw have a compression release? First thing I'd check is the pull start assy. Starting fluid will make the fuel more combustible and makes the process of clearing out the combustion chamber much quicker. Create an account to follow your favorite communities and start taking part in conversations. 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. }. 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. 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. "interactionType": "https://schema.org/CommentAction", Try blowing the crankcase out with air. Sometimes, the ignition rope is frayed or stuck inside the starter housing. 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. This compression converts fuel (any source) into the potential energy in the engine to start it. "name": "Egbinor" Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. Would not be afraid to do it to a 4, 6, or V-8. A drastic and frankly silly thing to do though . If you find the brake drum moving, you must replace the needle bearing. "@type": "InteractionCounter", Then Google "decarb". It would give you rusted bearings. { 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. Each chainsaw has a different level of compression. Compression is measured by using a simple screw-in gauge. We will explain the causes of high compression and how you can quickly fix it to make it run smoothly. Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when starting. This is because each machine is made differently and has various needs. An example of data being processed may be a unique identifier stored in a cookie. Use recommedend chain oil lubricant. Locate the spark plug from the top of the engine underneath the chain brake handle. I thought all the fuel was out but there was some in the line yet. 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. 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. what and or where is the metering lever.? "@type": "Organization", You never try to get it to run with the choke on. 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. Use of this Web site constitutes acceptance of our. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. I just picked up a well used 025 that runs like a champ and has quite a bit of compression, I have not put a gauge on it but it will pull the starting handle out of my hands if I'm not paying attention. Quoting Removed, click Modern View to see Don't put water in the saw-ever. But it was stolen along with other tools around 1990. Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? To ensure that enough air reaches the chain saw's engine, remove the air filter and clean or replace it, depending on the manufacturer's instructions. The compression limit should also be doubled if the engine capacity is 100 CC. There is no carbon build up and all looks like new. Not sure it would accomplish anything on a 2-stroke chain saw engine. To ensure correct functioning and to prevent excessive compression, you might have to repair worn-out parts with new ones. Stihl chainsaw compression test Joe_Power Jun 2, 2015 Not open for further replies. Additionally, most spark plugs come pre-gapped. 1. saw has new carb 2. flywheel has been removed and key inspected. Also check the air filters and make sure they are clean. Reddit and its partners use cookies and similar technologies to provide you with a better experience. I've done it to high hour Kohler engines many times. I'm also going to double check it has the correct resistor type spark plug. For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. You can unclog the carburetor if the clog is minor. Register today and take advantage of membership benefits. "name": "Yesterday's Tractor Co.", Check the chainsaws fuel if you have not used the tool for a while. Stihl is a leading manufacturer of chainsaws and other handheld outdoor and landscaping power tools. Take off the muffler or the carb to get access. It runs good after I get it started. 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. Indoor fly traps are an effective way to keep insects away from your home. I bought 2 032 Stihl saws at auction that pulled very hard. Dust particles in the air mix with the lubricating oil and clog up the air filter, therefore, preventing sufficient air from getting into the engine. Also take the spark plug out and do the same. I've got one here with 105-110 compression that I can't get to run and it feels kinda funny when I pull the starter rope, like it has compression with the piston going up and down. For a better experience, please enable JavaScript in your browser before proceeding. Modern View Forum powered by phpBB 2001, 2005 phpBB Group. I bought 2 032 Stihl saws at auction that pulled very hard. TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. Why is the Garage Door Opener Light Not Working? Winterizing a pool is an important step in maintaining the longevity and health of your pool. The second thing, Read More Stihl Chainsaw Charger Not WorkingContinue, Your email address will not be published. A chainsaw with no spark will shut down suddenly or not start at all. A compression gauge is used to measure the compression of a chainsaw which works similarly to the tire gauge. When the fuel starts to turn stale, it gums up and clogs the carburetor just as it would in an unused lawnmower. It's from not pulling hard enough. Even though it was purchased "brand new" I'm not so sure. It's supposed to warm up later this week so I'll be able to do some more on this chain saw. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. 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! Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. Most Stihl chainsaws have a resistance of 0.2-3.0 ohm on the primary coil and 5-20 kiloohm on the secondary coil but always confirm the correct reading for your model number. Don't put water into the 2 stroke. Welcome! or Best Offer. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Check if the wires are damaged or broken and replace them if necessary. How big a fella are ya? There are sprays (power tune) for removing carbon, but I doubt if that's your problem. $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 How does it feel with the spark plug removed? That model is extremely easy to flood. Continue with Recommended Cookies. in the cylinder overnight because the rings are cerboned up? With the choke engaged, pull the starting rope several times again, and the chain saw should start on the third pull. Take better care of your chainsaw and perform regular maintenance according to the manufacturers recommendations to prevent any of these problems. I hope my epic guides will help you to choose,buy and maintain 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 used to have a Homelite that would do that if I left gas in it. I'll even do the labor for free. Generally covering everything under 25 HP. water will not dissolve carbon; it is far too hard to be effected. Are you sure the starter rope isn't a little too short? As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Typically, several reasons cause too much compression in a chainsaw and these include but are not limited to: Another common cause of chainsaw compression problems is a faulty quantity of old gasoline. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. Loosen the nuts holding the clutch cover and disconnect the chain shroud and remove the oil plate. The consent submitted will only be used for data processing originating from this website. Does the saw have a compression release? 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. Below are the reasons the chain keeps coming loose and how to fix it. First, remove the spark plug from the chainsaw. People sometimes try to cut down a tree that is too big for their chainsaw. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . I got it started. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. I;ve read somewhere to put water? Move the selector lever up one position immediately or the saw will flood on the very next pull. Spark plugs that are not functioning properly are another probable cause of excessive compression. To clean it, drain the fuel, spray some carburetor cleaner and loosen the residue with a small brush. The spark plug is located in the engine and ignites the fuel and air mixture, driving the piston and running the engine. 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. NelsGarage.com All Rights Reserved 2021 Theme: Prefer by, Stihl Chainsaw Troubleshooting & How-to Guide. 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. water will not dissolve carbon; it is far too hard to be effected. Pull the rope until it starts. I usual only choke my MS250 for one pull and no longer have the flooding issue. 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. You are using an out of date browser. Generally the minimum is 110 lbs. You can also quickly fix this anomaly by ensuring a proper troubleshooting of the pulley compartment to find damages. The plug should be tight against your thumb. Repair or replace the damaged part 2. Any ideas? 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. Make sure it's greased and the bushings are good. You can follow the steps on how to troubleshoot and revive it when it wont start. Low pressure, 20 to 30 pounds is all you need. If the chainsaw is too much compression, it may be difficult to start. 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. So, If you feel too much compression while pulling a chainsaw, the possible reasons might be as below. You may also notice that the chain saw loses power during operation. If you suspect a compression issue, seek professional help as compression repairs can be complicated. I've done it to high hour Kohler engines many times. A large engine has a huge capacity in its motor. Wipe off the excess fuel from the spark plug with a clean rag. 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. Yeah, I must have flooded it as I was working on it. Soaking in water will do nothing but rust things up . Currently I live in Austin, United States. Yes I tried that last time and it did help some. Check the choke of the chainsaws engine and make sure it is completely closed. Stihl MS290 MS390 MS310 Chainsaw Has Oil Tank Engine Housing Assembly OEM/ Bin G . Turn the engine to get under the piston and blow the crankcase out. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. everything is harder in a tree, not a conclusive test. Check the spark plug and replace it if needed. "height": 57 Disconnect the spark plug from the engine and inspect if it is damaged, eroded, or dirty. I've seen a 20psi drop with the wrong type of gauge to be pretty common. Would not be afraid to do it to a 4, 6, or V-8. Remove the spark plug with a spark plug wrench and clean it with a brush to remove carbon scoring and dirt. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Turn the engine to get under the piston and blow the crankcase out. It's also possible the piston or cylinder are scored or carboned up. It very often kicks back and pulls the starter rope back in. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. I hook up a drill to the nut on the clutch and start hard starting saws that way . My one and only MS250 was a kicker to start it but that was the only problem. Let saw run until its warmed up, and go cut wood. All it needs is a few inches missing and it will pull too hard like the compression is too high. Didnt somehow get straight oil in the cylinder did you? Pull the starter rope until you hear the first sign of it firing with a small burp. Ensure the chain fits snugly inside of the bar and the teeth that keep it in place are not worn down too low. I have had the cylinder off. We're all about fixing small engines, from carburetor rebuilds, to crankshaft machining. 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.. The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull. Also check the air filters and make sure they are clean. Check the electrode gap of the spark plug and ensure it is 0.02 inches. A two-stroke gas-powered chainsaw uses relatively few moving parts. Has someone invented a new kind of two stroke motor? I have a MS250 that has come up on compression since new. By checking & repairing/replacing these, you can fix the issue. Turn the idle speed clockwise until the saw idles and chain turns, and then make a one-fourth counterclockwise turn. 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. What worked with my MS440 kicking problem should also work with that one. Is the spark plug the correct one for the saw? Replaced the chain and did some serious cutting and was so pleased. I have a MS250 that has come up on compression since new. Does the saw have a compression release? A drastic and frankly silly thing to do though . Now, how much compression the engine of a chainsaw needs depends upon its motor capacity and temperature. If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. Compression gauges are not always accurate and different engines will provide different results. On a 2 stroke the water would go into the crank case first and pool up. "@id": "https://www.yesterdaystractors.com/" A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips. The plug should be tight against your thumb. 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. 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. 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. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. It is a prevalent issue and can be fixed and detected easily without consulting a mechanic. 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. A faulty spark plug will have carbon, dirt, and oil blocking the insulator nose, preventing it from firing consistently.
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