If it is the right sparkplug and not flooded, I would maybe buy a different saw with easy start. In most cases, a buildup of carbon under the rings presses the rings against the cylinder, culminating in compression of the cylinder. 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. It is a prevalent issue and can be fixed and detected easily without consulting a mechanic. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Stihl MS250 hard to pull? in Chainsaws - The Forestry Forum Use a screw wrench to loosen the nuts on the guide bar side panel to give you room to adjust the chain. Any ideas? Stihl ms 291 ? Here's How to Fix It Quickly You will notice the compression less. Stihl 291 chainsaw too much compression Check the compression of the engine. How Many Amps Does a Garage Door Opener Use? Problem starting Stihl 032AV chainsaw - Houzz However, you still have to confirm the size of the gap before installing. 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. Use recommedend chain oil lubricant. I got it started. If it has to do with small engines, it's welcome here. 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. Gas with ethanol also burns hotter than gasoline which can cause the engine to overheat and burn the plug electrodes. Is the spark plug the correct one for the saw? If not I'm honestly kinda stumped. "image": { 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. It is like there is too much compression. So, If you feel too much compression while pulling a chainsaw, the possible reasons might be as below. Press question mark to learn the rest of the keyboard shortcuts. Cleaned air filters and both were very dirty. $799.99 CHOOSE AN OPTION Deliver From Store e.g., 123 Your Street, Virginia Beach, VA 12345 Add to Cart Order Online - Pick Up In Store Currently Shopping At: JC Licht Ace Hardware-Bridgeport (773) 523-8888 Change My dealer Features STIHL M-Tronic Final step: removing the old spark plug and installing the new one. Are you sure the starter rope isn't a little too short? Ok folks, I'm stumped. 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. Are you sure the starter rope isn't a little too short? A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. Not sure it would accomplish anything on a 2-stroke chain saw engine. We and our partners use cookies to Store and/or access information on a device. I would never put water in it! The following have been addressed. The choke position is the fourth setting on the master control lever. Try blowing the crankcase out with air. A drastic and frankly silly thing to do though . If cleaning does not help release oil onto the bar, the pump may be damaged and require replacing. Additionally, most spark plugs come pre-gapped. water will not dissolve carbon; it is far too hard to be effected. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. "@id": "https://www.yesterdaystractors.com/" 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. Versions MS 260, Bar length 37cm, RSC This compression converts fuel (any source) into the potential energy in the engine to start it. Compression is measured by using a simple screw-in gauge. 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. Use of this Web site constitutes acceptance of our. STIHL Chainsaws FAQs | STIHL Product FAQs | STIHL USA "userInteractionCount": 23 I bought 2 032 Stihl saws at auction that pulled very hard. Starting fluid will make the fuel more combustible and makes the process of clearing out the combustion chamber much quicker. }, Thanks. It is significantly tougher to pull over than an 024 or the new 241. I can probably find one with at most 65 PSI. I've done it to high hour Kohler engines many times. Stihl 024 - Sherlock Holmes issue - help needed here. Check the choke of the chainsaws engine and make sure it is completely closed. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. It was metering lever. I hook up a drill to the nut on the clutch and start hard starting saws that way . How Much Compression Should a Chainsaw Have. 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 plug should be tight against your thumb. The first step is to remove the cover that covers the spark plug on your chainsaw. You can use a ratchet to do the task. 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. If oil is in there it is what makes the engine feel like it is almost locked up. Chainsaw has too much compression - Tool Talk Forum Change in temperatures and dirt will cause clogging anywhere the oil passes, and this can prevent the oil from spread all across the bar. 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. Keep in mind that the stuck ignition rope can also damaged other parts inside the starter assembly. For a better experience, please enable JavaScript in your browser before proceeding. I have a MS250 that has come up on compression since new. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. You never try to get it to run with the choke on. If the chainsaw is too little compression, it may start easily but will not run smoothly. Even with new spark plugs in, incorrectly removing and installing the spark plugs can prevent the engine from starting. By getting your pool ready for the winter, you can make sure it will be ready to use in the spring. With the choke engaged, pull the starting rope several times again, and the chain saw should start on the third pull. Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. Although this is often true, it is not always the case. For a better experience, please enable JavaScript in your browser before proceeding. The purpose of a choke in a chainsaw is to make cold starting more effortless, but if you do not use it properly. Why Is My Chainsaw Hard to Pull? (5 Things to Check) If your chainsaw doesnt automatically turn it off or you forget, the engine cuts off immediately. I have a MS250 that has come up on compression since new. MS 260 - Robust chainsaw for forestry work - Stihl Turn the engine to get under the piston and blow the crankcase out. Stihl chainsaw compression test | Bob Is The Oil Guy Get it ported and it brings it to another level. 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. Sounds like it was broken in "right", show the guy how to start it and tell him to be happy. I'm an arborist by profession & a blogger by passion. Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? You should also make sure the new gas you use is appropriate for the chainsaw. NelsGarage.com All Rights Reserved 2021 Theme: Prefer by, Stihl Chainsaw Troubleshooting & How-to Guide. When your Stihl chainsaw doesnt start after changing the spark plug and fuel, some common problems to look for can help diagnose the source of the issue. "height": 57 However, these moving parts, to stay moving, require a substantial amount of compression. But it was stolen along with other tools around 1990. This Indoor Fly Traps: 5 Things You Didn't Know About Indoor Fly Traps. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. 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. Being new carb, wasn't looking that direction educate a non mechanic. Of all the Stihl saws, the MS250 is the toughest to start in relation to it's size. Make sure it's greased and the bushings are good. Locate the tension adjustment screws to the side of the chainsaw guide bar. 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. Modern View Forum powered by phpBB 2001, 2005 phpBB Group. If any of these components are worn or broken, the chain saw wont start even with fuel. If you do not replace the starter spring on time, it will cause you to replace the whole starter assembly. A drastic and frankly silly thing to do though . "@id":"https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=toolt&th=435118", I have a MS250 that has come up on compression since new. 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. "datePublished": "2017-08-17", Then Google decarb . I tried draining the crankcase with the saw upside . It is harmful to your machine to use old fuel. The spark plug is located in the engine and ignites the fuel and air mixture, driving the piston and running the engine. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. All it needs is a few inches missing and it will pull too hard like the compression is too high. "width": 200, I hook up a drill to the nut on the clutch and start hard starting saws that way . "@context":"https://schema.org", Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. If the spark plug is working correctly and you have good fuel, there still has to be enough fuel in the combustion chamber for the engine to start correctly. Then Google "decarb". Check the saws exterior for loose bolts, nuts, and screws and tighten them with an adjustable wrench or screwdriver. Remove the entire carburetor and clean it. Make sure it's greased and the bushings are good. 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. Help, can barley pull Stihl MS250, too much compression My /Sthil 034 is very difficult to start. "@type": "Person", check the cylinder & piston for carbon build-up, how much compression Does the chainsaw Engine need, How To Reset Echo 58-Volt Battery Charger. It does not take much to increase the compression. It is, therefore, necessary to determine if the problem has been remedied by adding fresh fuel. If anything prevents the right amount of fuel into the combustion chamber, the chainsaw wont start. }, "interactionStatistic": { If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. We're all about fixing small engines, from carburetor rebuilds, to crankshaft machining. 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. Stihl Chainsaw Troubleshooting & How-to Guide - Nels Garage Similarly, a 4-stroke engine needs 2 times more compression than a 2-stroke engine, around 180-210 PSI. If the chainsaw is too much compression, it may be difficult to start. ", after that I'd be looking at crank bearings. Stihl MS250 Too High of Compression? - Arborist, Chainsaw & Tree Work Forum When there is no air for the spark to ignite, the chainsaw will start and then die after a short while. As a result, normal compression settings will change based on the kind of chainsaw machine you are using. ProTip: You can use a small air compressor to blow air through the air filter and get rid of the loose dust before proceeding to clean it further. water will not dissolve carbon; it is far too hard to be effected. "author": { Some of the contributing reasons include a full tank of oil, carbon buildup on the exhaust system, and malfunctioning spark plugs. Would not be afraid to do it to a 4, 6, or V-8. It prevents the carburetor from allowing too much fuel into the combustion chamber. Create an account to follow your favorite communities and start taking part in conversations. Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. The early 064, 044, 066 came with a red master control. It runs good after I get it started. 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. You can clean and mildly clogged carburetor but if it is too severe, replace it with one compatible with your chainsaw model. Don't put water into the 2 stroke. The recoil starter in a chainsaw is a start mechanism that allows you to pull the rope. That is what was told to me by the area distributor technician That is the nature of a 250. The spark arrestor in a chainsaw traps exhaust products emitted from an internal combustion engine. High compression in chainsaws is a dangerous problem that can lead to serious injuries. 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. The saw runs and starts great. Turn the brake off. JavaScript is disabled. To test the recoil starter, remove it and reposition the spring. 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. Stihl is a leading manufacturer of chainsaws and other handheld outdoor and landscaping power tools. If you still have questions regarding high chainsaw compression, you can discuss them in the comments. 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. Quoting Removed, click Modern View to see What?? Would have to remove spark plug and rinse cylinder with gas to be able to start. 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. Stihl MS 250 C Compression Release - lilredbarn.net JavaScript is disabled. I think that's what I'd do. 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. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Other than damaged parts, using the choke position to start a warm saw often causes a flooded engine. Continue with Recommended Cookies. When you are doing a cold start, push the choke lever to the warm start when the engine starts to run. I hope my epic guides will help you to choose,buy and maintain chainsaw. Check for broken teeth on the chain and replace them if necessary. Stihl chainsaw compression test Joe_Power Jun 2, 2015 Not open for further replies. Lift the bars nose and tighten the nuts on the sidebar to secure the sidebar and guide bar in place. If you find the brake drum moving, you must replace the needle bearing. I changed to synthitic. I think that's what happened, although I didn't think such a small amount could do it. "@type": "Organization", 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! Stihl chainsaw low compression diagnoses and How To - YouTube Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. The ignition coil transmits electricity to the spark plug to create a spark that ignites the engine. 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!!! STIHL Chainsaw Parts Engines for sale | eBay How Much Compression Should A Chainsaw Have - Toolsadvisorpro Repair or replace the damaged part 2. An excessive amount of compression in your chainsaws starting rope could also be indicated by the beginning rope failing to draw. Once the 250 is running, its fine. Yes I tried that last time and it did help some. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. I've seen it happen a couple times. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. If it is hard to pull, then check how the spring is performing. pulls with little resistance, similar to my farm boss. I'm also going to double check it has the correct resistor type spark plug. #3. Has someone invented a new kind of two stroke motor? As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Then Google decarb . 1. saw has new carb 2. flywheel has been removed and key inspected. You can also quickly fix this anomaly by ensuring a proper troubleshooting of the pulley compartment to find damages. I've seen a 20psi drop with the wrong type of gauge to be pretty common. Suitable Replacement Stihl MS 250 C Compression Release Parts 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. Pull the recoil off and check for binding Pull rope or starter pawls misaligned. When the oil pimp or oiler is faulty, it will reduce the chainsaws performance and power. Doesnt pull at all or just hard to pull. If this does not fix the issue, it may be necessary to replace the whole starting rope system with another one. If you refuel your chainsaw and it still won,t start, below are some of the possible causes and solutions that will get the chainsaw functioning again. Pull the rope until it starts. You never try to get it to run with the choke on. Remove ignition coil and muffler. Small Engine Technician 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. 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. Welcome! 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. Currently I live in Austin, United States. If A two cycle engine gets flooded BADLY, oil can separate from the gas mix, accumulate in the crankcase and creates an hydrostatc lock. More information can be found on this page. "dateModified": "2017-08-17", anthonyg_ma Original Author 16 years ago Canguy, thnks for the tips! Uninstall the spark arrestor and unblock it using a brush, but you can also replace it for efficiency. Confirm the spark plug gap, check and adjust with a feeler gauge or gaping tool. Carboned rings will decrease not increase compression. You can unclog the carburetor if the clog is minor. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. So, in our suggestion, one of the first things to check while feeling high compression is the starter spring. Carboned rings will decrease not increase compression. 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. 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?? 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. . Reassemble the chainsaw, refill the fuel tank, crank the engine and check for oil along the bar. Reddit and its partners use cookies and similar technologies to provide you with a better experience.