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. Trying to rotate the chain while a huge piece of wood is . Now it has sat since the last use and I went to start it and it turned over maybe three times and the compression . If the chainsaw is too little compression, it may start easily but will not run smoothly. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Even though it was purchased "brand new" I'm not so sure. Move the selector lever up one position immediately or the saw will flood on the very next pull. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. Runs well, except it. It would give you rusted bearings. $75.00. Compression gauges are not always accurate and different engines will provide different results. The spark arrestor in a chainsaw traps exhaust products emitted from an internal combustion engine. 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. Fuel filters trap dirt and contaminants from the fuel to prevent them from damaging the engine. If the spark plug is too corroded or the electrode is faulty, it cannot create an electrical current to start the system. Try blowing the crankcase out with air. It is possible however to flood a two stroke which can cause the plug to fowl. Ask him if he's drop-starting it. 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. It runs good after I get it started. This may sometimes jam your chainsaws rings, causing it to become inoperable. Additionally, most spark plugs come pre-gapped. Take off the muffler or the carb to get access. For 503552201 Cylinder Compression Plug Package Include: 3 x Cylinder Plug Cylinder Compression Plug To fix this problem, turn off the chain saw and let it sit for about 30 minutes to allow the excess gas to evaporate. "datePublished": "2017-08-17", The Stihl chainsaw uses a four-position lever ignition system called the master control lever. Stihl chainsaw compression test Joe_Power Jun 2, 2015 Not open for further replies. All it needs is a few inches missing and it will pull too hard like the compression is too high. 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. "@type":"DiscussionForumPosting", 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 will notice the compression less. If you see any unusual movement of spring, then take it in to replace it. 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.. An example of data being processed may be a unique identifier stored in a cookie. Always change the spark plug after 100 operating hours of the chainsaw to avoid engine problems. I have a MS250 that has come up on compression since new. This increased distance will cause the chain to keep coming out of the guiding bar with the vibrating saw. 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. 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. Has someone invented a new kind of two stroke motor? If cleaning does not help release oil onto the bar, the pump may be damaged and require replacing. Any ideas? Also take the spark plug out and do the same. Would not be afraid to do it to a 4, 6, or V-8. It may not display this or other websites correctly. The lack of oil dries the chainsaw assembly, which causes high compression and becomes very difficult for you to handle the chainsaw. If this does not fix the issue, it may be necessary to replace the whole starting rope system with another one. You can check the compression by pulling the spark plug out and holding it in your hand. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. water will not dissolve carbon; it is far too hard to be effected. Once it's removed, you can place a gauge on the place of the spark plug. This can lead to serious injuries, including cuts and amputations. Try it, it may just do the trick! In a similar vein, if the wrong kind of oil is used, the compression may be increased. Thanks. 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. When this pressure, or compression, is too low or high, the chainsaw . However, you still have to confirm the size of the gap before installing. The following have been addressed. You have an option to either pull off the starter and clean it or look for an ideal replacement for your starter house. 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. Get you some Sea Foam at the local auto parts store. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Check for clogging around the bar oil. Get it ported and it brings it to another level. Not sure it would accomplish anything on a 2-stroke chain saw engine. 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. This compression converts fuel (any source) into the potential energy in the engine to start it. I used to have a Homelite that would do that if I left gas in it. Repair or replace the damaged part 2. The chain clutch might be, Read More Cordless Chainsaw Wont StartContinue, The most common reason is simply the wrong battery. By getting your pool ready for the winter, you can make sure it will be ready to use in the spring. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. 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. A large engine has a huge capacity in its motor. I have plenty of engines with REALLY low compression that I'll be glad to swap him. It takes a Bosch WSR6F or NGK BPMR7A. Don't put water into the 2 stroke. I would suspect the timing is too early. If you buy another battery, make sure it has the same voltage and amperage as the old battery. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Pour starting fluid into the carburetor and crank the engine several times. No carbon on top or on roof of cylinder. 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. "description":"Discussion of Chainsaw has too much compression in the Tool Talk forum followed by comments. Thank you for the responses. Your email address will not be published. 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. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. A drastic and frankly silly thing to do though . "userInteractionCount": 23 But it was stolen along with other tools around 1990. Normally it's not a problem but if it was already difficult to pull it could be. Soaking in water will do nothing but rust things up . 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. If the compression is not produced in the engine at an appropriate level, it will not be able to convert fuel into energy. Don't know what to do at this point. For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. Continue with Recommended Cookies. "@type": "ImageObject", By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. This could be understood by reading the further explanation below. Don't put water into the 2 stroke. When there is no air for the spark to ignite, the chainsaw will start and then die after a short while. Final step: removing the old spark plug and installing the new one. If you regularly use the chainsaw, then there might be the possibility that your starter spring breaks off. Turn the brake off. 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. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. My chainsaw has gotten very hard to pull the rope. Reddit and its partners use cookies and similar technologies to provide you with a better experience. The vibration of the tool during use can run some fasteners loose, preventing it from starting again. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Has someone invented a new kind of two stroke motor? 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. Sometimes the spring stops working correctly due to overuse and becomes brittle. Doesnt pull at all or just hard to pull. You are using an out of date browser. Replace the fuel filters instead of cleaning them as they are pretty affordable and easy to install too. 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. However, if I push downward on the trigger button, it slows down to. Although this is often true, it is not always the case. Quoting Removed, click Modern View to see What?? John Deere and its logos are the registered trademarks of the John Deere Corporation. If your chainsaw doesnt automatically turn it off or you forget, the engine cuts off immediately. Check the saws exterior for loose bolts, nuts, and screws and tighten them with an adjustable wrench or screwdriver. "dateModified": "2017-08-17", . The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. 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. The exhaust is black but no build up. Versions MS 260, Bar length 37cm, RSC Does the saw have a compression release? Ron Cook. I'm hearing thats just the nature of the beast. You are using an out of date browser. You will notice the compression less. If the compression is too high or too low, the engine wont start. Your chainsaws compressive strength is measured with the use of a screw-in gauge. If a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. Make sure it's greased and the bushings are good. Find the low speed, high speed, and idle speed screws near the carburetor, start the engine and allow it to warm up. NelsGarage.com All Rights Reserved 2021 Theme: Prefer by, Stihl Chainsaw Troubleshooting & How-to Guide. When you are doing a cold start, push the choke lever to the warm start when the engine starts to run. Also check the air filters and make sure they are clean. The manual for this model, and the parts breakdown, show a compression release valve. I went with a meteor piston/cylinder set. Stihl 024 - Sherlock Holmes issue - help needed here. The other cause of your chainsaws high compression could be the stuck ignition rope. ", The carburetor is a significant part of the chainsaw. We describe all the possible issues and also suggest the solutions to fix them too. . I wouldn't go messing with the carb expecting to cure the issue unless you have obvious signs of flooding when trying to start. "height": 57 Cleaned it all up, and had it tuned up. Help, can't pull start Stihl MS250 chainsaw, too much compression. Confirm the spark plug gap, check and adjust with a feeler gauge or gaping tool. Blup throttle to bring it down to idle. 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. With the choke engaged, pull the starting rope several times again, and the chain saw should start on the third pull. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Wipe off lubricant and grime from the bar with a clean rag. On a 2 stroke the water would go into the crank case first and pool up. What is the minimum compression for my STIHL chainsaw? Being in the cutting services for more than 10 years, I know a thing or two about chainsaw. How Much Compression Should a Chainsaw Have. It would give you rusted bearings. Then Google "decarb". However, these moving parts, to stay moving, require a substantial amount of compression. Turn the engine to get under the piston and blow the crankcase out. How To Fix Chainsaw Battery Charger Blinking Red? Being new carb, wasn't looking that direction educate a non mechanic. chain saw compression release mod. It may not display this or other websites correctly. 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. 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. Stihl oil has been used. Clean any mildly dirty parts and replace all the damaged parts. 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 is a prevalent issue and can be fixed and detected easily without consulting a mechanic. 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. Remove the filter, engine control lever and Stihl carburetor. 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. If the air filter is too clogged, you should replace it. John Deere and its logos are the registered trademarks of the John Deere Corporation. 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. When the engine starts running, turn the choke off. I've done it to high hour Kohler engines many times. I think that's what happened, although I didn't think such a small amount could do it. When there is too much fuel, it will not ignite, and the engine wont start. "@type": "Organization", Remove the air filter, wash it with detergent and water and scrub off the dirt with a brush. Cleaned air filters and both were very dirty. The end of the tester must protrude exact the same volume into the cylinder as the spark plug or the reading will be wrong. 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. Pull trigger and set full choke. Check the choke of the chainsaws engine and make sure it is completely closed. I;ve read somewhere to put water? Stihl recommends using 89 octane gasoline without ethanol, and the gas should not contain more than 10% ethanol. Then Google decarb . When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. The engine creates a vacuum pressure inside it. If you find the brake drum moving, you must replace the needle bearing. It very often kicks back and pulls the starter rope back in. Low pressure, 20 to 30 pounds is all you need. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . "name": "Yesterday's Tractor Co.", Without proper compression, the engine will not be able to suck and use the fuel for combustion. "@id": "https://www.yesterdaystractors.com/" (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 Make sure you have a replacement spark plug on hand in case the problem recurs in the future. 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. How big a fella are ya? The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull. If it does maybe it is plugged. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. Mar 24, 2019. Temperature Of The Engine A heavy-duty engine gets hot faster and works better than a cold engine. "author": { "@type": "InteractionCounter", 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. I hook up a drill to the nut on the clutch and start hard starting saws that way . Try blowing the crankcase out with air. The ignition system is responsible for igniting the fuel and air mixture to produce energy that powers the chainsaw. You're familiar with how to start a stihl yes? "@id":"https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=toolt&th=435118", Unscrew the clutch assembly on top of the oil pump. Once the 250 is running, its fine. Does the saw have a compression release? Get you some Sea Foam at the local auto parts store. It's from not pulling hard enough. Unscrew the spark plug using a ratchet and screw the compression gauge in its place. Disconnect the spark plug from the engine and inspect if it is damaged, eroded, or dirty. There might be a small stone or thing that is stuck inside the starter and causes the rope not to retract. It works when cold-starting the engine, when the engine is idle and when the engine is open. Are you sure the starter rope isn't a little too short? Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. Here is a link for two stroke engine air cycle. lol. Oct 24, 2011 / Chainsaw excessive compression #1 . If A two cycle engine gets flooded BADLY, oil can separate from the gas mix, accumulate in the crankcase and creates an hydrostatc lock. Take off the muffler or the carb to get access. Check the chain oiler and ensure it is functional. It is basically the same product as TruFuel (same base synthetic fuel with different synthetic oil) that is sold through Stihl dealers and endorsed for use in all Stihl 2-stroke engines. 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. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. Would not be afraid to do it to a 4, 6, or V-8. Generally covering everything under 25 HP. 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. If oil is in there it is what makes the engine feel like it is almost locked up. We will explain the causes of high compression and how you can quickly fix it to make it run smoothly. Try it, it may just do the trick! I'll even do the labor for free. "@context":"https://schema.org", Make sure there is oil in the engine. You may also want to go ahead and replace the plug. No compression when pulling start rope. I was given (estate) a small McCulloch chain saw and it started and ran great. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. Would not be afraid to do it to a 4, 6, or V-8. Locate the spark plug from the top of the engine underneath the chain brake handle. I have a MS250 that has come up on compression since new. A clear sign that you may have a chainsaw engine is when you smell gas while starting it. I've seen a 20psi drop with the wrong type of gauge to be pretty common. If oil is in there it is what makes the engine feel like it is almost locked up. We and our partners use cookies to Store and/or access information on a device. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. You can unclog the carburetor if the clog is minor. The flywheel is loose? 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. It had a compression release, and it started and ran well. Please use the navigational links to explore our website. A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips. It uncoils, tightens the spring, engages the clutch to start the engine. Uninstall the spark arrestor and unblock it using a brush, but you can also replace it for efficiency. It is like there is too much compression. } Remove ignition coil and muffler. 1. saw has new carb 2. flywheel has been removed and key inspected. Currently I live in Austin, United States. JavaScript is disabled. 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! Carbon buildup is yet another important factor in the increasing compression experienced by chain saws over time. You never try to get it to run with the choke on. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . 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. Stihl chainsaw low compression diagnoses and How To Dave's Small Engines 8.89K subscribers Subscribe 17K views 2 years ago This video shows a Stihl MS310 chainsaw I have apart from low. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. If anything prevents the right amount of fuel into the combustion chamber, the chainsaw wont start. Sometimes, the ignition rope is frayed or stuck inside the starter housing. When the oil pimp or oiler is faulty, it will reduce the chainsaws performance and power. Keep in mind that the stuck ignition rope can also damaged other parts inside the starter assembly. Maybe the piston is hitting it. As the chain moves over the bar, it spreads the oil across the moving parts to reduce friction and heat. I usual only choke my MS250 for one pull and no longer have the flooding issue. However, this will vary by model and compression readings alone are not enough to determine the condition of the engine. Soaking in water will do nothing but rust things up . You will notice the compression less. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Carboned rings will decrease not increase compression. Stihl 251 chainsaw. It prevents the carburetor from allowing too much fuel into the combustion chamber. Drain and discard the old fuel, mix new fuel and cycle oil in the ratio 50:1 in a container, shake it and then pour the mixture into the chainsaws fuel tank. If it looks physically fine after cleaning it and you havent changed it in a few seasons, you should still replace it. Sometimes an adapter is needed to make a tight fit. Pull trigger and set full choke. I bought 2 032 Stihl saws at auction that pulled very hard. Also check the air filters and make sure they are clean. Other than damaged parts, using the choke position to start a warm saw often causes a flooded engine. 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. If it is not physically damaged, clean it with clean gasoline and a rag. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Remove the right side cover, bar, and chain. 24" is what I've got on mine, but it can handle a bigger bar. Turn the engine to get under the piston and blow the crankcase out. The spark plug is located in the engine and ignites the fuel and air mixture, driving the piston and running the engine. Use of this Web site constitutes acceptance of our. Didnt somehow get straight oil in the cylinder did you? Also check the air filters and make sure they are clean. 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. And some will have more. On a 2 stroke the water would go into the crank case first and pool up. Try it, it may just do the trick! I would suggest clearing the cylinder by pulling the rope with the plug out. 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. I got it started. Here is how to troubleshoot a malfunctioning spark plug. "mainEntityOfPage": { 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. 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. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", In most cases, a buildup of carbon under the rings presses the rings against the cylinder, culminating in compression of the cylinder. Then, use a wire brush to remove all the carbon build-up from the cylinder and piston. 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. Subsequent starts are just as hard. }, Admitted Woodaholic. Soaking in water will do nothing but rust things up . Below are the reasons the chain keeps coming loose and how to fix it. Don't put water into the 2 stroke. You are misunderstanding WHY water is put into carboned up engines. 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. That is the nature of a 250. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. I would suspect the timing is too early. Gas with ethanol also burns hotter than gasoline which can cause the engine to overheat and burn the plug electrodes.
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