The purpose of a choke in a chainsaw is to make cold starting more effortless, but if you do not use it properly. It's also possible the piston or cylinder are scored or carboned up. The other reason might be the use of the wrong type of oil for the climate. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Once the 250 is running, its fine. Youll need to clean the cylinder and piston to fix this thoroughly. The Pulley compartment plays a massive role in retracting the ignition rope. High compression in chainsaws is a dangerous problem that can lead to serious injuries. Check for clogging around the bar oil. Lift the bars nose and tighten the nuts on the sidebar to secure the sidebar and guide bar in place. When the air that reaches the chain saw's engine is insufficient, it becomes prone to overheating. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. NelsGarage.com All Rights Reserved 2021 Theme: Prefer by, Stihl Chainsaw Troubleshooting & How-to Guide. The other cause of your chainsaws high compression could be the stuck ignition rope. Check the tension 2. That is the nature of a 250. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. 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. 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. Save my name, email, and website in this browser for the next time I comment. } 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 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. Here is a link for two stroke engine air cycle. Sometimes an adapter is needed to make a tight fit. Quoting Removed, click Modern View to see Don't put water in the saw-ever. If the chainsaw is too much compression, it may be difficult to start. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. No carbon on top or on roof of cylinder. Move the selector lever up one position immediately or the saw will flood on the very next pull. You should also make sure the new gas you use is appropriate for the chainsaw. If it does maybe it is plugged. Use of this Web site constitutes acceptance of our. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", If you suspect a compression issue, seek professional help as compression repairs can be complicated. Why is the Garage Door Opener Light Not Working? If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. water will not dissolve carbon; it is far too hard to be effected. Although this is often true, it is not always the case. $49.99. However, you still have to confirm the size of the gap before installing. Our aftermarket suitable replacement Stihl MS 250 C chainsaw compression release parts meet or beat OEM specs, offer a considerable cost savings, and usually ship in 24 - 48 hours. Carbon buildup is yet another important factor in the increasing compression experienced by chain saws over time. In addition, you should check the muffler and piston while youre at this point. When this pressure, or compression, is too low or high, the chainsaw . I've done it to high hour Kohler engines many times. Remove the air filter, wash it with detergent and water and scrub off the dirt with a brush. Chainsaw Parts. Also, remove the muffler and check for carbon buildup. Unscrew the spark plug wrench using a spark plug from the engine. I;ve read somewhere to put water? "width": 200, A 250 has a fair amount of compression for a smaller saw but not that bad. Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. Disengage the chain brake, turn on the ignition switch and install the new spark plug into the rubber connector. If it has to do with small engines, it's welcome here. It's an older saw I bought at a garage sale. "height": 57 If oil is in there it is what makes the engine feel like it is almost locked up. I wouldn't go messing with the carb expecting to cure the issue unless you have obvious signs of flooding when trying to start. In a similar vein, if the wrong kind of oil is used, the compression may be increased. The starter assembly often fails to rotate due to a weak connection between the pulley and the ignition rope. 1. saw has new carb 2. flywheel has been removed and key inspected. If the air filter is too clogged, you should replace it. Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? A hot engine also requires more compression to convert furl into energy as compared to the colder one. More information can be found on this page. You can follow the steps on how to troubleshoot and revive it when it wont start. Not sure it would accomplish anything on a 2-stroke chain saw engine. If you buy another battery, make sure it has the same voltage and amperage as the old battery. Can also be used with hedge trimmer attachment HS 246. You will notice the compression less. A compression gauge is used to measure the compression of a chainsaw which works similarly to the tire gauge. Indoor fly traps are an effective way to keep insects away from your home. The excess gas can be cleared simply by removing the plug and operating the starter a few times. I would never put water in it! Thank you for the responses. 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. Take better care of your chainsaw and perform regular maintenance according to the manufacturers recommendations to prevent any of these problems. 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. Any ideas? "@type": "Person", When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. I'm hearing thats just the nature of the beast. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . }, When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. If anything prevents the right amount of fuel into the combustion chamber, the chainsaw wont start. As the chain moves over the bar, it spreads the oil across the moving parts to reduce friction and heat. If it is the right sparkplug and not flooded, I would maybe buy a different saw with easy start. . To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. 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. There might be a small stone or thing that is stuck inside the starter and causes the rope not to retract. If it has damaged parts, replace it with a carburetor kit that fits your chainsaw model. "@type": "ImageObject", Being in the cutting services for more than 10 years, I know a thing or two about chainsaw. If the starter spring is keep working correctly, it will retract the ignition rope. Don't know what to do at this point. water will not dissolve carbon; it is far too hard to be effected. I got it started. If you find the brake drum moving, you must replace the needle bearing. If the rails are shallow, you need to replace them. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. Most times, when the Stihl chainsaw stops working, it is never a complete breakdown. I changed to synthitic. SPONSORED. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Spark plugs that are not functioning properly are another probable cause of excessive compression. Remove the entire carburetor and clean it. Use recommedend chain oil lubricant. Has someone invented a new kind of two stroke motor? Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. To ensure correct functioning and to prevent excessive compression, you might have to repair worn-out parts with new ones. It very often kicks back and pulls the starter rope back in. 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. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. The ignition system is responsible for igniting the fuel and air mixture to produce energy that powers the chainsaw. 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. Wipe off the excess fuel from the spark plug with a clean rag. The vibration of the tool during use can run some fasteners loose, preventing it from starting again. Repair or replace the damaged part 2. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. With the choke engaged, pull the starting rope several times again, and the chain saw should start on the third pull. My husky 266xp has been that away from newjust pull over slow for 2 or 3 times and then try cranking.. You are misunderstanding WHY water is put into carboned up engines. Other than damaged parts, using the choke position to start a warm saw often causes a flooded engine. When there is too much fuel, it will not ignite, and the engine wont start. Any help out thereEGBinOR Get you some Sea Foam at the local auto parts store. Don't know what to do at this point. }, It would give you rusted bearings. I used to have a Homelite that would do that if I left gas in it. If it is over loading on fuel the carb may need rebuilt to stop the diaphragm from leaking fuel into the cylinder after the saw is shut off. That model is extremely easy to flood. Does the saw have a compression release? It will be apparent if it is, but usually a scored saw won't run good, if at all. Youre familiar with how to start a stihl yes? 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 Stihl chainsaw uses a four-position lever ignition system called the master control lever. It would give you rusted bearings. Hello. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. To fix this problem, turn off the chain saw and let it sit for about 30 minutes to allow the excess gas to evaporate. When the oil pimp or oiler is faulty, it will reduce the chainsaws performance and power. The Stihl 066 chainsaw uses the same type of engine most gasoline-powered yard tools use, a two-cycle combustion engine. You can check the compression by pulling the spark plug out and holding it in your hand. anthonyg_ma Original Author 16 years ago Canguy, thnks for the tips! Check the spark plug and replace it if needed. Pull the recoil off and check for binding Pull rope or starter pawls misaligned. For 503552201 Cylinder Compression Plug Package Include: 3 x Cylinder Plug Cylinder Compression Plug Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. I would suspect the timing is too early. 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. Then Google "decarb". As far as compression, you can usually tell by how the saw pulls when starting it. The saw feels good in my hands and its got a surprising amount of power. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. "mainEntityOfPage": { I think that's what I'd do. If that is true, I'd suspect that the timing is off and why it's ripping the cord from your hand. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. I went with a meteor piston/cylinder set. I would never put water in it! Here is how to troubleshoot a malfunctioning spark plug. Wipe off any flammable fluid from the metal surface of the engine with a clean rag. $75.00. Try it, it may just do the trick! #1. The end of the tester must protrude exact the same volume into the cylinder as the spark plug or the reading will be wrong. 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. 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. Make sure the crank taper is clean and the flywheel taper also. Remove the right side cover, bar, and chain. If it is hard to pull, then check how the spring is performing. A clear sign that you may have a chainsaw engine is when you smell gas while starting it. First, remove the cylinder and piston from the chainsaw. 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. "width": 200, Once it's removed, you can place a gauge on the place of the spark plug. My one and only MS250 was a kicker to start it but that was the only problem. If you do not replace the starter spring on time, it will cause you to replace the whole starter assembly. Quoting Removed, click Modern View to see What?? None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. 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. If you regularly use the chainsaw, then there might be the possibility that your starter spring breaks off. "@type": "Organization", The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull. Ron Cook. 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 possible the timing is off a little but without knowing the make and model of the saw that's just a long shot. Your chainsaws compressive strength is measured with the use of a screw-in gauge. This Indoor Fly Traps: 5 Things You Didn't Know About Indoor Fly Traps. Cleaned air filters and both were very dirty. The compression limit should also be doubled if the engine capacity is 100 CC. water will not dissolve carbon; it is far too hard to be effected. Move the selector lever up one position immediately or the saw will flood on the very next pull. For a better experience, please enable JavaScript in your browser before proceeding. 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?? A clogged carburetor wont allow fuel into the engine, preventing it from starting. We got rid of both of those useless things . Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. 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. Make sure it's greased and the bushings are good. External air goes into the engine through the air filter to cool down the chainsaw engine and also mix with the fuel to ignite and run the saw. If you suspect a compression issue, seek professional help as compression repairs can be complicated. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. If I drop start it I can pull it through 1 compression stroke. Use a can of carb cleaner sprayed into the breather/filter assembly. So, If you feel too much compression while pulling a chainsaw, the possible reasons might be as below. It is possible however to flood a two stroke which can cause the plug to fowl. 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. It works when cold-starting the engine, when the engine is idle and when the engine is open. Pour starting fluid into the carburetor and crank the engine several times. Now, how much compression the engine of a chainsaw needs depends upon its motor capacity and temperature. Its just that its nearly impossible to pull. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) Wipe off any dirt and debris and check for any signs of damages. It prevents the carburetor from allowing too much fuel into the combustion chamber. This is because each machine is made differently and has various needs. of compression. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Try blowing the crankcase out with air. However, this will vary by model and compression readings alone are not enough to determine the condition of the engine. Trying to rotate the chain while a huge piece of wood is . The consent submitted will only be used for data processing originating from this website. I've done it to high hour Kohler engines many times. The saw runs and starts great. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . If you see any unusual movement of spring, then take it in to replace it. Thanks! or Best Offer. At this point, the battery will reset,, Read More How To Reset Echo 58-Volt Battery ChargerContinue, The chainsaw battery charger is constantly blinking red, even after charging for a long time!!! Then, use a wire brush to remove all the carbon build-up from the cylinder and piston. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. After initial pull on rope (which feels like vapor lock on cylinder), saw will start on second or third pull. 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. 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. It runs good after I get it started. Too much carbon will do that, check the piston top and combustion chamber. Make sure the gap is according to the specifications of your chainsaws engine. We and our partners use cookies to Store and/or access information on a device. If there is any damage to the pulley at any stage, it will cause High Compression or stiffness during a pull.. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. If the reading is below or above the required range, then your ignition coil requires changing. }. Likewise, low compression in the engine will be slow and retarding and it is a warning sign of leakage in your engine. It is usual for the chainsaw chains to come off with continued use, but there is usually an underlying cause when its too repetitive. My name is Chris Ross. You are using an out of date browser. Ensure the wires leading to the On/Off switch are not tangled or in contact with the metal part of the engine if there is no spark. Small Engine Technician 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 heavy-duty engine gets hot faster and works better than a cold engine. Unscrew the spark plug using a ratchet and screw the compression gauge in its place. Has someone invented a new kind of two stroke motor? Obviously, the motor, which has a huge capacity, will require more compression. Stihl recommends using 89 octane gasoline without ethanol, and the gas should not contain more than 10% ethanol. Then Google decarb . That is the nature of a 250. You will notice the compression less. In this case fixing or repairing is required or worst replacing the engine all at once. We have explained the most effective way to unflood a chainsaw engine below. Make sure the keyway is lined up correctly and tighten the nut down good and tight. For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. Remove the sprocket and the washer. Detailed, well-researched, and accurate home and garden information presented in an understandable format is our primary goal. The ignition coil transmits electricity to the spark plug to create a spark that ignites the engine. Hold the saw firmly to the ground and crank the engine about four to six times to bleed out the fuel from the combustion chamber. Pull the starter rope until you hear the first sign of it firing with a small burp. Cleaned air filters and both were very dirty. Change in temperatures and dirt will cause clogging anywhere the oil passes, and this can prevent the oil from spread all across the bar. NelsGarage will share the knowledge Ive gathered about different tools and give you tips to accomplish your DIY projects faster. While rope attached to a pulley, the further connection of the pulley is with springs and pawl to make sure the pulley is tensioned and helps in retracting and spinning. Choke cannot be used even when engine cold, or flooding occurs. 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. The key on the flywheel is in place and not sheered. A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. Replaced the chain and did some serious cutting and was so pleased. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Generally covering everything under 25 HP. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. A lot of variables might contribute to excessive compression while using a chainsaw. That is what was told to me by the area distributor technician Check for side play in the crankshaft. You can check the compression by pulling the spark plug out and holding it in your hand. Remove the filter, engine control lever and Stihl carburetor. $99.95. My question is what is causing the trigger to not slow down. Take off the muffler or the carb to get access. "publisher": { That is what was told to me by the area distributor technician That is the nature of a 250. check the cylinder & piston for carbon build-up, how much compression Does the chainsaw Engine need, How To Reset Echo 58-Volt Battery Charger. 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. $20.00 shipping. link to Winterize Your Pool Like a Pro: A Comprehensive Guide for Home owners. Do that to the starter side when you're looking at the starter assy. My first chain saw was an old Homelite EZ with a blue metal case and a 20" bar. I would suspect the timing is too early. When the engine starts running, turn the choke off. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. What worked with my MS440 kicking problem should also work with that one. If the chainsaw is too little compression, it may start easily but will not run smoothly. Guido Quoting Removed, click Modern View to see What?? Suitable Replacement Stihl MS 250 C Compression Release Parts If it is flooded that should clear it up. Turn the engine to get under the piston and blow the crankcase out. If it does maybe it is plugged. Carboned rings will decrease not increase compression. chain saw compression release mod. If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. So, in our suggestion, one of the first things to check while feeling high compression is the starter spring. ", Use an adjustable wrench to loosen the two nuts on both sides of the chainsaw. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", Winterize Your Pool Like a Pro: A Comprehensive Guide for Home owners. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Any ideas? 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. Locate the spark plug from the top of the engine underneath the chain brake handle. "@type": "WebPage", First thing I'd check is the pull start assy. Get it ported and it brings it to another level. I believe it was flooded, but I didn't think that little bit of fuel would make it that hard to pull but I guess so since it can't compress!