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. The excess gas can be cleared simply by removing the plug and operating the starter a few times. Check for any cracks and damages and replace if necessary. You can use a ratchet to do the task. "@context":"https://schema.org", Check for side play in the crankshaft. I went with a meteor piston/cylinder set. Not sure it would accomplish anything on a 2-stroke chain saw engine. It does not take much to increase the compression. That is what was told to me by the area distributor technician. It was metering lever. Ensure the chain fits snugly inside of the bar and the teeth that keep it in place are not worn down too low. 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. Generally the minimum is 110 lbs. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. I bought it used around 1978. I have had the cylinder off. Find the low speed, high speed, and idle speed screws near the carburetor, start the engine and allow it to warm up. On a 2 stroke the water would go into the crank case first and pool up. Guido Quoting Removed, click Modern View to see What?? Sometimes an adapter is needed to make a tight fit. link to Indoor Fly Traps: 5 Things You Didn't Know About Indoor Fly Traps. I would suspect the timing is too early. Carboned rings will decrease not increase compression. Has someone invented a new kind of two stroke motor? ", My question is what is causing the trigger to not slow down. If the air filter is too clogged, you should replace it. Friction is usually the cause of a rope failing to draw when it should. or Best Offer. If I drop start it I can pull it through 1 compression stroke. My name is Chris Ross. It's from not pulling hard enough. If the starter spring is keep working correctly, it will retract the ignition rope. What worked with my MS440 kicking problem should also work with that one. "@type": "WebPage", Therefore, most people will wonder why the chainsaw has too much compression. Would have to remove spark plug and rinse cylinder with gas to be able to start. First thing I'd check is the pull start assy. 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. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Carboned rings will decrease not increase compression. 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. Every chainsaw engine has a different capacity depending upon its motor power. 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. Likewise, low compression in the engine will be slow and retarding and it is a warning sign of leakage in your engine. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. Cleaned air filters and both were very dirty. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. No carbon on top or on roof of cylinder. Youre familiar with how to start a stihl yes? chain saw compression release mod. 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. Check the choke of the chainsaws engine and make sure it is completely closed. Every chainsaw requires a different compression level according to its built-up and model number. Even with new spark plugs in, incorrectly removing and installing the spark plugs can prevent the engine from starting. 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. However, you still have to confirm the size of the gap before installing. 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. idle. Carbon buildup is yet another important factor in the increasing compression experienced by chain saws over time. Check the chain oiler and ensure it is functional. With the choke engaged, pull the starting rope several times again, and the chain saw should start on the third pull. More information can be found on this page. Does the saw have a compression release? Check if the wires are damaged or broken and replace them if necessary. To fix this problem, turn off the chain saw and let it sit for about 30 minutes to allow the excess gas to evaporate. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. Low pressure, 20 to 30 pounds is all you need. The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull. The saw runs and starts great. Any ideas? Now, how much compression the engine of a chainsaw needs depends upon its motor capacity and temperature. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Posted December 27, 2017. 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. That model is extremely easy to flood. If not I'm honestly kinda stumped. It very often kicks back and pulls the starter rope back in. Dont substitute it with. The ignition coil transmits electricity to the spark plug to create a spark that ignites the engine. Hello. ", 4 Possible Problems & Solutions Problem 1: Damaged starter housing Solution: 1. You're familiar with how to start a stihl yes? 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. I think you'll like it. It may not display this or other websites correctly. Turn the engine to get under the piston and blow the crankcase out. Obviously, the motor, which has a huge capacity, will require more compression. If the chainsaw engine dies when you release the throttle, turn the low-speed screw with a screwdriver clockwise until it stops and then turns it counterclockwise once. I would never put water in it! Stihl recommends using 89 octane gasoline without ethanol, and the gas should not contain more than 10% ethanol. Being in the cutting services for more than 10 years, I know a thing or two about chainsaw. I'm also going to double check it has the correct resistor type spark plug. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. I usual only choke my MS250 for one pull and no longer have the flooding issue. 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. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Pull the starter rope and look for a blue spark between the electrode of the spark plug. That is what was told to me by the area distributor technician Check for side play in the crankshaft. #1. Now it has sat since the last use and I went to start it and it turned over maybe three times and the compression . All it needs is a few inches missing and it will pull too hard like the compression is too high. When this pressure, or compression, is too low or high, the chainsaw . Check the tension 2. I;ve read somewhere to put water? 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. Try it, it may just do the trick! 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. water will not dissolve carbon; it is far too hard to be effected. You can unclog the carburetor if the clog is minor. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. On a 2 stroke the water would go into the crank case first and pool up. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. 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 it is hard to pull, then check how the spring is performing. A faulty spark plug will have carbon, dirt, and oil blocking the insulator nose, preventing it from firing consistently. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. Any ideas? Step 1: Prepare the chainsaw Remove the spark plug from the chainsaw. If it does maybe it is plugged. 24" is what I've got on mine, but it can handle a bigger bar. Please use the navigational links to explore our website. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. However, this will vary by model and compression readings alone are not enough to determine the condition of the engine. I would suspect the timing is too early. A compression gauge is used to measure the compression of a chainsaw which works similarly to the tire gauge. Soaking in water will do nothing but rust things up . I hook up a drill to the nut on the clutch and start hard starting saws that way . The following have been addressed. Small Engine Technician Would have to remove spark plug and rinse cylinder with gas to be able to start. { "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", It is possible however to flood a two stroke which can cause the plug to fowl. pulls with little resistance, similar to my farm boss. The Stihl chainsaw uses a four-position lever ignition system called the master control lever. The manual for this model, and the parts breakdown, show a compression release valve. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. The power of the motor of an engine is measured in its capacity. Is the spark plug the correct one for the saw? It is thus highly recommended that you drain the fuel from your chainsaw if it still has any old gasoline left in it. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. I have a MS250 that has come up on compression since new. Didnt somehow get straight oil in the cylinder did you? Make sure there is oil in the engine. Remove the sprocket and the washer. Could your gauge be off a little? The key on the flywheel is in place and not sheered. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. However, these moving parts, to stay moving, require a substantial amount of 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. It is harmful to your machine to use old fuel. Unscrew the spark plug using a ratchet and screw the compression gauge in its place. Stihl MS290 MS390 MS310 Chainsaw Has Oil Tank Engine Housing Assembly OEM/ Bin G . 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. The second thing, Read More Stihl Chainsaw Charger Not WorkingContinue, Your email address will not be published. I got it going. Wear rubber gloves and hold the rubber plug and spark plug about 1-2cm from the metal surface of the engine unit. Disconnect the spark plug from the engine and inspect if it is damaged, eroded, or dirty. water will not dissolve carbon; it is far too hard to be effected. It would give you rusted bearings. 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. What ratio mix is he using? Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. Check the saws exterior for loose bolts, nuts, and screws and tighten them with an adjustable wrench or screwdriver. 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. Use a brush and cloth to clean and remove any dirt, mud, or debris that can interfere with the controlsclean around the chain brake lever, the air filter housing, and the filter. } Has someone invented a new kind of two stroke motor? Mar 24, 2019. 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. If it does maybe it is plugged. Register today and take advantage of membership benefits. Thanks! Get you some Sea Foam at the local auto parts store. 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 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. I would suspect the timing is too early. My husky 266xp has been that away from newjust pull over slow for 2 or 3 times and then try cranking.. 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?? or Best Offer. Don't know what to do at this point. Repair or replace the damaged part 2. Replace with a new starter house Problem 2: Damaged pulley system Solution: 1. 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 have a MS250 that has come up on compression since new. The end of the tester must protrude exact the same volume into the cylinder as the spark plug or the reading will be wrong. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. stihl ms290 farm boss; By Ron Cook December 27, 2017 in General Chat. Youll need to clean the cylinder and piston to fix this thoroughly. Move the selector lever up one position immediately or the saw will flood on the very next pull. The carburetors work in a chainsaw engine allows the right amount of fuel and air mixture into the combustion chamber. Pull trigger and set full choke. Follow the steps below on how to fix a flooded chainsaw engine. Read More Chainsaw Primer Bulb Temporary FixContinue, Pull out your battery from the chainsaw, and press the battery button sustainably for a minimum of 5 seconds before you release it. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. NelsGarage will share the knowledge Ive gathered about different tools and give you tips to accomplish your DIY projects faster. I would never put water in it! Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. In other words, the problem is in the trigger itself, not a. carb adjustment screw. It would give you rusted bearings. Its just that its nearly impossible to pull. 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. "height": 57 Other than damaged parts, using the choke position to start a warm saw often causes a flooded engine. Cleaned air filters and both were very dirty. The exhaust side of the piston is a warm gold. 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. For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. To test the recoil starter, remove it and reposition the spring. 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. I was given (estate) a small McCulloch chain saw and it started and ran great. "@type": "Person", As long as I can get it going.. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. Sparkplug was correct but I think it was a little flooded. Don't know what to do at this point. 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.. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. A clogged carburetor wont allow fuel into the engine, preventing it from starting. It works when cold-starting the engine, when the engine is idle and when the engine is open. in the cylinder overnight because the rings are cerboned up? The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. That is a high compression saw, pull the rope slowly until you feel resistance then give it a short quick pull. If your saw doesn't have a compression release since like you say its not a pro, then the two things I would check is either the go through recoil assembley with a fine tooth comb. Another big issue that causes too much high compression is the lack of oil in the starter system. After that, using a ratchet, remove the spark plug from the engine. I would suspect the timing is too early. Then Google decarb . Remove the filter, engine control lever and Stihl carburetor. Use of this Web site constitutes acceptance of our. Sounds like it was broken in "right", show the guy how to start it and tell him to be happy. A lot of variables might contribute to excessive compression while using a chainsaw. Low pressure, 20 to 30 pounds is all you need. 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. "@type": "InteractionCounter", Below we have discussed the most common reasons why your chainsaw wont idle and the best way to fix it. This can lead to serious injuries, including cuts and amputations. But it was stolen along with other tools around 1990. You are misunderstanding WHY water is put into carboned up engines. "width": 200, It will be apparent if it is, but usually a scored saw won't run good, if at all. Finally the fuel will be converted into energy. Just wondering what your opinions are of the lowest compression you can run a Stihl MS250 at. Compression gauges are not always accurate and different engines will provide different results. 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. However, if I push downward on the trigger button, it slows down to. Don't know what to do at this point. 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. We will explain the causes of high compression and how you can quickly fix it to make it run smoothly. Several reasons can cause your Stihl chainsaw to bog down when your pull the trigger. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. 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. It is significantly tougher to pull over than an 024 or the new 241. Loosen the nuts and bolts clockwise and then pull out the oil pump gently. 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. Check the chain tension and adjust it if it is too loose or tight. When there is no air for the spark to ignite, the chainsaw will start and then die after a short while. Modern View Forum powered by phpBB 2001, 2005 phpBB Group. It prevents the carburetor from allowing too much fuel into the combustion chamber. 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. It is a prevalent issue and can be fixed and detected easily without consulting a mechanic. 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. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. You never try to get it to run with the choke on. Too much carbon will do that, check the piston top and combustion chamber. Open the spark plug hole facing away from you, remove the wire from the spark plug and disconnect the spark plug using a spark plug wrench. what and or where is the metering lever.? This could be understood by reading the further explanation below. Thanks. Block the spark plugs hole by putting a nylon rope to prevent the piston from moving. 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. Low pressure, 20 to 30 pounds is all you need. no, afraid I don't have equipment to test. 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. after that I'd be looking at crank bearings. "@id": "https://www.yesterdaystractors.com/" How Much Compression Should a Chainsaw Have. The vibration of the tool during use can run some fasteners loose, preventing it from starting again. Why is the Garage Door Opener Light Not Working? Admitted Woodaholic. We describe all the possible issues and also suggest the solutions to fix them too. This compression converts fuel (any source) into the potential energy in the engine to start it. 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. Keep in mind that the stuck ignition rope can also damaged other parts inside the starter assembly. Create an account to follow your favorite communities and start taking part in conversations. For 503552201 Cylinder Compression Plug Package Include: 3 x Cylinder Plug Cylinder Compression Plug Sometimes, this might be triggered by another problem that is impacting your system. First, remove the cylinder and piston from the chainsaw. Oct 7, 2019 / Minimum compression for a Stihl 2 cycle #3 the actual numbers will vary from one tool to another Getting accurate numbers without special tools is quite difficult because of the small volumes. Carboned rings will decrease not increase compression. 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. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. First thing I'd check is the pull start assy. 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. }, 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. 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. 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.