stihl chainsaw too much compression

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. Confirm the spark plug gap, check and adjust with a feeler gauge or gaping tool. Soaking in water will do nothing but rust things up . If you see any unusual movement of spring, then take it in to replace it. Pull trigger and set full choke. Pull the rope until it starts. 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. Can also be used with hedge trimmer attachment HS 246. Always change the spark plug after 100 operating hours of the chainsaw to avoid engine problems. If it is flooded that should clear it up. That is what was told to me by the area distributor technician, 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. A two-stroke gas-powered chainsaw uses relatively few moving parts. Locate the tension adjustment screws to the side of the chainsaw guide bar. If it does maybe it is plugged. lol. Don't know what to do at this point. I have a MS250 that has come up on compression since new. I would suggest clearing the cylinder by pulling the rope with the plug out. Try it, it may just do the trick! 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. This increased distance will cause the chain to keep coming out of the guiding bar with the vibrating saw. The choke position is the fourth setting on the master control lever. If it is hard to pull, then check how the spring is performing. 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. Finally the fuel will be converted into energy. Runs well, except it. You need to pull the exhaust to check that. 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. "@type": "Person", It may not display this or other websites correctly. This may sometimes jam your chainsaws rings, causing it to become inoperable. 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. Disengage the chain brake, turn on the ignition switch and install the new spark plug into the rubber connector. 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. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. 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. Use a can of carb cleaner sprayed into the breather/filter assembly. Over time or when using the wrong fuel, the fuel filter becomes too clogged and restricts fuel flow, killing the engine shortly after starting. It takes a Bosch WSR6F or NGK BPMR7A. The second thing, Read More Stihl Chainsaw Charger Not WorkingContinue, Your email address will not be published. Compression gauges are not always accurate and different engines will provide different results. Check for clogging around the bar oil. It runs good after I get it started. It may not display this or other websites correctly. You may also notice that the chain saw loses power during operation. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. Does the saw have a compression release? There are sprays (power tune) for removing carbon, but I doubt if that's your problem. OEM GOOD USED STIHL 048AV CHAINSAW SHORT BLOCK ENGINE 120 PSI COMPRESSION. 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?? If the starter spring is keep working correctly, it will retract the ignition rope. The switch might be damaged or the motor is burned out. The recoil starter in a chainsaw is a start mechanism that allows you to pull the rope. Reddit and its partners use cookies and similar technologies to provide you with a better experience. 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. How big a fella are ya? Remove the entire carburetor and clean it. stihl ms290 farm boss; By Ron Cook December 27, 2017 in General Chat. Press question mark to learn the rest of the keyboard shortcuts. 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. "@type": "ImageObject", Sometimes, this might be triggered by another problem that is impacting your system. 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. A flooded engine is when there is too much gas in the combustion chamber, usually due to repeatedly starting the chainsaw using the recoil system without the engine starting. That is what was told to me by the area distributor technician That is the nature of a 250. Don't know what to do at this point. Im Nelson, a DIY enthusiast with a bottomless can-do attitude. This can lead to serious injuries, including cuts and amputations. It runs good after I get it started. If any of these components are worn or broken, the chain saw wont start even with fuel. If the chainsaw is too much compression, it may be difficult to start. Change in temperatures and dirt will cause clogging anywhere the oil passes, and this can prevent the oil from spread all across the bar. You can prevent the new starter rope from fraying by burning the two ends of the rope. Stihl MS192T Chainsaw Fuel Oil Tank Engine Housing Assembly OEM. 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 If a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. In a similar vein, if the wrong kind of oil is used, the compression may be increased. Pull the recoil off and check for binding Pull rope or starter pawls misaligned. Sometimes the spring stops working correctly due to overuse and becomes brittle. The correct tension of the chainsaw chain should be slightly loose on the guide bar but tight enough that you cant pull the drive links out of the bar to fix the chain tension issues; follow the steps below. 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 will also add that if you have points, then the wrong gap will alter the point of ignition and can have the same results. It's also possible the piston or cylinder are scored or carboned up. People sometimes try to cut down a tree that is too big for their chainsaw. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. $75.00. John Deere and its logos are the registered trademarks of the John Deere Corporation. You can also quickly fix this anomaly by ensuring a proper troubleshooting of the pulley compartment to find damages. { "userInteractionCount": 23 Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. "datePublished": "2017-08-17", 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. Just wondering what your opinions are of the lowest compression you can run a Stihl MS250 at. A smaller gap will cause a weak spark and poor ignition of the engine, while a wider gap will not bring out any spark. Remove the air filter, wash it with detergent and water and scrub off the dirt with a brush. A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. read more Vince O. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. 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. If that doesnt work, try gently tapping on the side of the bulb with a screwdriver or other tool. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. Make sure the keyway is lined up correctly and tighten the nut down good and tight. Would not be afraid to do it to a 4, 6, or V-8. Unscrew the spark plug using a ratchet and screw the compression gauge in its place. 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. You will notice the compression less. Cleaned air filters and both were very dirty. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . water will not dissolve carbon; it is far too hard to be effected. Too much carbon will do that, check the piston top and combustion chamber. }, Ron Cook. A 50CC engine needs 150 PSI compression. I would suspect the timing is too early. You never try to get it to run with the choke on. I usual only choke my MS250 for one pull and no longer have the flooding issue. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. You have an option to either pull off the starter and clean it or look for an ideal replacement for your starter house. in the cylinder overnight because the rings are cerboned up? Maybe the piston is hitting it. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. Has someone invented a new kind of two stroke motor? There is no idle when I release the trigger. 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. Try taking it out, Then holding the trigger while you pull fast. A heavy-duty chainsaw requires a large amount of compression, whereas a chainsaw with a smaller engine needs less compression to convert fuel into energy. Ask him if he's drop-starting it. The following have been addressed. For a better experience, please enable JavaScript in your browser before proceeding. You are misunderstanding WHY water is put into carboned up engines. (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 there is oil in the engine. Replace with a new starter house Problem 2: Damaged pulley system Solution: 1. Modern View Forum powered by phpBB 2001, 2005 phpBB Group. Please use the navigational links to explore our website. 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. Your email address will not be published. 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. Help, can't pull start Stihl MS250 chainsaw, too much compression. If repeated cleaning does not fully unclog the carburetor, you will have to replace it. I was given (estate) a small McCulloch chain saw and it started and ran great. To inspect the guide bar, disassemble the chain cover, chain and bar. Register today and take advantage of membership benefits. That is the nature of a 250. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. It's from not pulling hard enough. So be sure to keep your chainsaw properly maintained and avoid compression problems. If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. 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. Tighten the tension screw with a screwdriver to tighten the chain around the bar. 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 there is too much fuel, it will not ignite, and the engine wont start. Create an account to follow your favorite communities and start taking part in conversations. I have a MS250 that has come up on compression since new. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Once youve done that, reassemble the chainsaw, which should work properly again. For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. If the chainsaw is too little compression, it may start easily but will not run smoothly. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. If cleaning does not help release oil onto the bar, the pump may be damaged and require replacing. We and our partners use cookies to Store and/or access information on a device. It is possible however to flood a two stroke which can cause the plug to fowl. A drastic and frankly silly thing to do though . water will not dissolve carbon; it is far too hard to be effected. Stihl recommends using 89 octane gasoline without ethanol, and the gas should not contain more than 10% ethanol. 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. When there is no air for the spark to ignite, the chainsaw will start and then die after a short while. I've done it to high hour Kohler engines many times. Would have to remove spark plug and rinse cylinder with gas to be able to start. Cylinder Compression Plug Applicable Model For STIHL 021, 023, 024, 025, 026, 044, 046, 066, MS210, MS230, MS240, MS250, MS260, MS341, MS360, MS440, MS460, MS650, MS660 Chainsaw Parts Refer To Part No. My question is what is causing the trigger to not slow down. Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. Find the low speed, high speed, and idle speed screws near the carburetor, start the engine and allow it to warm up. I get it going now and its easier but its still a bear. If this is the case, you may want to try lubricating the rope to see if it would assist to resolve the difficulties. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. The lack of oil dries the chainsaw assembly, which causes high compression and becomes very difficult for you to handle the chainsaw. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. 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. "height": 57 Hello D beatty, Here is a link for two stroke engine air cycle, Guido. Are you sure the starter rope isn't a little too short? It is possible however to flood a two stroke which can cause the plug to fowl. 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. } Turn the idle speed clockwise until the saw idles and chain turns, and then make a one-fourth counterclockwise turn. . You never try to get it to run with the choke on. You are using an out of date browser. As a result of using bad fuel or leaving fuel in the chainsaw for a long time, the fuel evaporates and leaves behind a sticky substance that accumulates and clogged the carburetor. What are the numbers on your sparkplug? I think you'll like it. It is harmful to your machine to use old fuel. It is typical for the Stihl chainsaw to develop some issues, and when this happens, some basic troubleshooting will help identify the source of the issue and solution to help it run smoothly. or Best . You can follow the steps on how to troubleshoot and revive it when it wont start. "@id":"https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=toolt&th=435118", } The plug should be tight against your thumb. There is no carbon build up and all looks like new. 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. Stihl chainsaw compression test Joe_Power Jun 2, 2015 Not open for further replies. The spark plug is located in the engine and ignites the fuel and air mixture, driving the piston and running the engine. I hook up a drill to the nut on the clutch and start hard starting saws that way . Locate the spark plug from the top of the engine underneath the chain brake handle. It's an older saw I bought at a garage sale. in the, All Rights Reserved. Winterizing a pool is an important step in maintaining the longevity and health of your pool. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. Now, the gauge might come in a number of size variations, so you need to use an adapter to make a perfect seal between the gauge and the chainsaw. I think that's what I'd do. "interactionStatistic": { Thanks! Replace the spark plug with a new identical. Keep in mind that the stuck ignition rope can also damaged other parts inside the starter assembly. "@type": "InteractionCounter", If you do not replace the starter spring on time, it will cause you to replace the whole starter assembly. Don't put water into the 2 stroke. Obviously, the motor, which has a huge capacity, will require more compression. Every chainsaw engine has a different capacity depending upon its motor power. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. Ron Cook. Use of this Web site constitutes acceptance of our. The piston and rings are very shiney. You are using an out of date browser. Likewise, low compression in the engine will be slow and retarding and it is a warning sign of leakage in your engine. Stihl is a leading manufacturer of chainsaws and other handheld outdoor and landscaping power tools. SPONSORED. Would have to remove spark plug and rinse cylinder with gas to be able to start. I'm also going to double check it has the correct resistor type spark plug. Unscrew the clutch assembly on top of the oil pump. Dont substitute it with. Hold the tip of the blade and adjust the tension of the chain correctly. I love to write about chainsaw for homeowners and professionals. Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. 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! Check if the wires are damaged or broken and replace them if necessary.

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