Help, can't pull start Stihl MS250 chainsaw, too much compression. in the. It had a compression release, and it started and ran well. But it was stolen along with other tools around 1990. It is significantly tougher to pull over than an 024 or the new 241. Runs well, except it. I would never put water in it! I agree the saw runs great, but when your helping old men with ideas of their own its hard to say I wish I had 190 pounds of compression. Start new topic; Recommended Posts. $49.99. Why is the Garage Door Opener Light Not Working? Thank you for the responses. Make sure you have a replacement spark plug on hand in case the problem recurs in the future. anthonyg_ma Original Author 16 years ago Canguy, thnks for the tips! Getting these problems resolved is a rather straightforward process. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. This Indoor Fly Traps: 5 Things You Didn't Know About Indoor Fly Traps. First thing I'd check is the pull start assy. We will explain the causes of high compression and how you can quickly fix it to make it run smoothly. Use an adjustable wrench to loosen the two nuts on both sides of the chainsaw. That is the nature of a 250. Generally the minimum is 110 lbs. I would never put water in it! Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? You can unclog the carburetor if the clog is minor. "@type":"DiscussionForumPosting", 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. Thus far, you have learned how to diagnose most problems with the Stihl chainsaw and how to fix the issues. Suitable Replacement Stihl MS 250 C Compression Release Parts You can prevent the new starter rope from fraying by burning the two ends of the rope. 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. Check the chainsaws fuel if you have not used the tool for a while. You never try to get it to run with the choke on. If it looks physically fine after cleaning it and you havent changed it in a few seasons, you should still replace it. John Deere and its logos are the registered trademarks of the John Deere Corporation. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. It is possible however to flood a two stroke which can cause the plug to fowl. Then Google "decarb". He checked.it clearly says that in the OP. The carburetor is a significant part of the chainsaw. Remove ignition coil and muffler. }. Activate the chain brake and then place the chainsaw on a flat, leveled surface. There might be a small stone or thing that is stuck inside the starter and causes the rope not to retract. Pull the rope until it starts. 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. "width": 200, Mar 24, 2019. That is what was told to me by the area distributor technician. "@id":"https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=toolt&th=435118", The power of the motor of an engine is measured in its capacity. 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. You need to pull the exhaust to check that. Hello. If a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. First thing I'd check is the pull start assy. When this pressure, or compression, is too low or high, the chainsaw . { It would give you rusted bearings. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. A drastic and frankly silly thing to do though . To avoid flooding the chainsaw when cold starting, turn the control lever to half choke after the fourth pull and then turn the lever again to the open choke position immediately when the engine starts. A cold engine will need the compression of 50-100 PSI whereas a hot engine will require compression above 150 PSI. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. Sounds flooded, or maybe wrong sparkplug? Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. Pull the rope until it starts. As the starter, spring plays a vital role in running starter assembly smoothly. chain saw compression release mod. I have a MS250 that has come up on compression since new. Recognised as a leading saw in the forestry industry, it is available in guide bar lengths 13"/32cm to 18"/45cm. Wash the dirty filter with a non-abrasive detergent and water. Unscrew the spark plug using a ratchet and screw the compression gauge in its place. Below we have discussed the most common reasons why your chainsaw wont idle and the best way to fix it. Wipe off any dirt and debris and check for any signs of damages. Pull trigger and set full choke. Would have to remove spark plug and rinse cylinder with gas to be able to start. A drastic and frankly silly thing to do though . Press J to jump to the feed. If you regularly use the chainsaw, then there might be the possibility that your starter spring breaks off. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. How does it feel with the spark plug removed? Register today and take advantage of membership benefits. Low pressure, 20 to 30 pounds is all you need. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. You will notice the compression less. I bought 2 032 Stihl saws at auction that pulled very hard. If this does not fix the issue, it may be necessary to replace the whole starting rope system with another one. If the rails are shallow, you need to replace them. The first step is to remove the cover that covers the spark plug on your chainsaw. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. Does the saw have a compression release? Sometimes the spring stops working correctly due to overuse and becomes brittle. Its just that its nearly impossible to pull. If the chainsaw engine dies when you release the throttle, turn the low-speed screw with a screwdriver clockwise until it stops and then turns it counterclockwise once. What are the numbers on your sparkplug? Get you some Sea Foam at the local auto parts store. 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. 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. We have explained the most effective way to unflood a chainsaw engine below. I bought 2 032 Stihl saws at auction that pulled very hard. I think you'll like it. Create an account to follow your favorite communities and start taking part in conversations. If it is flooded that should clear it up. 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. "name": "Egbinor" If your chainsaw doesnt automatically turn it off or you forget, the engine cuts off immediately. Is the spark plug the correct one for the saw? 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. 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. "headline":"Chainsaw has too much compression", Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. Replace the spark plug with a new identical. 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. Youll need to clean the cylinder and piston to fix this thoroughly. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Sometimes it kicks and the rope pulls right out of my hand. The plug should be tight against your thumb. Below are the reasons the chain keeps coming loose and how to fix it. The plug should be tight against your thumb. idle. Move the selector lever up one position immediately or the saw will flood on the very next pull. When the fuel starts to turn stale, it gums up and clogs the carburetor just as it would in an unused lawnmower. It was metering lever. "width": 200, Your email address will not be published. As the chain moves over the bar, it spreads the oil across the moving parts to reduce friction and heat. Try it, it may just do the trick! You can also quickly fix this anomaly by ensuring a proper troubleshooting of the pulley compartment to find damages. The second thing, Read More Stihl Chainsaw Charger Not WorkingContinue, Your email address will not be published. Quoting Removed, click Modern View to see What?? You should also make sure the new gas you use is appropriate for the chainsaw. Not sure it would accomplish anything on a 2-stroke chain saw engine. We got rid of both of those useless things . }, Yeah, I must have flooded it as I was working on it. If oil is in there it is what makes the engine feel like it is almost locked up. Reassemble the chainsaw, refill the fuel tank, crank the engine and check for oil along the bar. OEM GOOD USED STIHL 048AV CHAINSAW SHORT BLOCK ENGINE 120 PSI COMPRESSION. Low pressure, 20 to 30 pounds is all you need. 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. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Check the tension 2. Any chance is it hydro locking because of gas? 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. When the air that reaches the chain saw's engine is insufficient, it becomes prone to overheating. The saw runs and starts great. It was easier to pull after I cleaned it up, but still tough. 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. Turn the brake off. Carboned rings will decrease not increase compression. You are using an out of date browser. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. You never try to get it to run with the choke on. "publisher": { Check the chain oiler and ensure it is functional. }, Detailed, well-researched, and accurate home and garden information presented in an understandable format is our primary goal. 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. no, afraid I don't have equipment to test. 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! How Many Amps Does a Garage Door Opener Use? Cleaned air filters and both were very dirty. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. Yes I tried that last time and it did help some. It is, therefore, necessary to determine if the problem has been remedied by adding fresh fuel. If the starter spring is keep working correctly, it will retract the ignition rope. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. How Much Does it Cost to Install a Garage Door Opener? If it does maybe it is plugged. What worked with my MS440 kicking problem should also work with that one. I bought 2 032 Stihl saws at auction that pulled very hard. after that I'd be looking at crank bearings. You can follow the steps on how to troubleshoot and revive it when it wont start. 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. Keep in mind that the stuck ignition rope can also damaged other parts inside the starter assembly. It's an older saw I bought at a garage sale. 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. Can also be used with hedge trimmer attachment HS 246. Blup throttle to bring it down to idle. }, "interactionType": "https://schema.org/CommentAction", This is bad practice, and can damage your chainsaw. The piston and rings are very shiney. A chainsaw with no spark will shut down suddenly or not start at all. Indoor fly traps are an effective way to keep insects away from your home. Too much hot or cold engine does not work or even start to produce vacuum pressure inside engine. 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. 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. 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. Locate the spark plug from the top of the engine underneath the chain brake handle. 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. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. This compression converts fuel (any source) into the potential energy in the engine to start it. A 50CC engine needs 150 PSI compression. You are misunderstanding WHY water is put into carboned up engines. If anything prevents the right amount of fuel into the combustion chamber, the chainsaw wont start. Versions MS 260, Bar length 37cm, RSC John Deere and its logos are the registered trademarks of the John Deere Corporation. 1 2 Next J Joe_Power Joined Apr 18, 2013 Messages 651 Location USA - Coast to Coast, Border to Border Jun 2, 2015 #1 I just replaced the cylinder and piston on a stihl 036. I;ve read somewhere to put water? The excess gas can be cleared simply by removing the plug and operating the starter a few times. I've done it to high hour Kohler engines many times. 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. When it comes to power tools, good maintenance, and proper use will maintain the functionality and lifespan of the tool regardless of whether it is an electric miter saw or a gas power chainsaw. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. Reddit and its partners use cookies and similar technologies to provide you with a better experience. "@type": "Person", If you suspect a compression issue, seek professional help as compression repairs can be complicated. Take off the muffler or the carb to get access. I've been working on a Stihl 026 chainsaw that John found, and it is very hard to crank. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. "height": 57 I got it going. Once youve done that, reassemble the chainsaw, which should work properly again. 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! Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. The owner is complaining of hard to pull start. Use a screw wrench to loosen the nuts on the guide bar side panel to give you room to adjust the chain. If that doesnt work, try gently tapping on the side of the bulb with a screwdriver or other tool. Use recommedend chain oil lubricant. We're all about fixing small engines, from carburetor rebuilds, to crankshaft machining. It will be apparent if it is, but usually a scored saw won't run good, if at all. 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. after that I'd be looking at crank bearings. You may also want to go ahead and replace the plug. Are you sure the starter rope isn't a little too short? My question is what is causing the trigger to not slow down. If the reading is below or above the required range, then your ignition coil requires changing. 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. How Much Compression Should a Chainsaw Have. If any of these components are worn or broken, the chain saw wont start even with fuel. 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. Don't put water into the 2 stroke. Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. I used to have a Homelite that would do that if I left gas in it. Friction is usually the cause of a rope failing to draw when it should. When you are doing a cold start, push the choke lever to the warm start when the engine starts to run. I have a MS250 that has come up on compression since new. water will not dissolve carbon; it is far too hard to be effected. Chainsaw Parts. However, this will vary by model and compression readings alone are not enough to determine the condition of the engine. The purpose of a choke in a chainsaw is to make cold starting more effortless, but if you do not use it properly. Uninstall the spark arrestor and unblock it using a brush, but you can also replace it for efficiency. If you recently refueled your Stihl chainsaw, stale gas can be a reason why it wont start. If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. Locate the tension adjustment screws to the side of the chainsaw guide bar. Stihl 291 chainsaw too much compression Check the compression of the engine. 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 pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Are you sure the starter rope isn't a little too short? I've done it to high hour Kohler engines many times. I wouldn't go messing with the carb expecting to cure the issue unless you have obvious signs of flooding when trying to start. 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. Each chainsaw has a different level of compression. I;ve read somewhere to put water? You are using an out of date browser. Just wondering what your opinions are of the lowest compression you can run a Stihl MS250 at. 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. 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. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. If it is not physically damaged, clean it with clean gasoline and a rag. 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. Block the spark plugs hole by putting a nylon rope to prevent the piston from moving. check the cylinder & piston for carbon build-up, how much compression Does the chainsaw Engine need, How To Reset Echo 58-Volt Battery Charger. 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. Flooding usually happens due to an underlying issue: a bad spark plug, bad gas, or a faulty carburetor. We and our partners use cookies to Store and/or access information on a device. Manage Settings The Stihl 066 chainsaw uses the same type of engine most gasoline-powered yard tools use, a two-cycle combustion engine. 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. 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 No compression when pulling start rope. Cleaned air filters and both were very dirty. By checking & repairing/replacing these, you can fix the issue. Admitted Woodaholic. I'll even do the labor for free. You will notice the compression less. i have a ms 250. This article will help you fix the most commonly reported problems of a Stihl chainsaw. "interactionStatistic": { 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. I'm an arborist by profession & a blogger by passion. 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. It would give you rusted bearings. The exhaust side of the piston is a warm gold. The recoil starter in a chainsaw is a start mechanism that allows you to pull the rope. It takes a Bosch WSR6F or NGK BPMR7A. The chain oil will keep the chain lubricated, keep off dirt and allow smooth movement. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. To clean it, drain the fuel, spray some carburetor cleaner and loosen the residue with a small brush. Make sure the keyway is lined up correctly and tighten the nut down good and tight. water will not dissolve carbon; it is far too hard to be effected. 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. How big a fella are ya? (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 If oil is in there it is what makes the engine feel like it is almost locked up. When the motor warms up after about a minute, turn on the choke position. Wear rubber gloves and hold the rubber plug and spark plug about 1-2cm from the metal surface of the engine unit. Not sure it would accomplish anything on a 2-stroke chain saw engine. I used to have a Homelite that would do that if I left gas in it. Remove The Chainsaw's Spark Plug Set The Pressure Test Gauge Tug On The Chainsaw's Starter Rope Reset The Chainsaw's Spark Plug Do The Thumb Test Remove The Spark Plug Place Your Thumb Over The Hole Tug On Your Chainsaw's Starter Rope Problems Caused By Too Little Or Too Much Compression Low pressure in a chainsaw High compression in a chainsaw Pull the starter rope until you hear the first sign of it firing with a small burp. However, you still have to confirm the size of the gap before installing. ", That is the nature of a 250. Another big issue that causes too much high compression is the lack of oil in the starter system. 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": "ImageObject", link to Indoor Fly Traps: 5 Things You Didn't Know About Indoor Fly Traps. I bought it used around 1978. Create an account to follow your favorite communities and start taking part in conversations. On a 2 stroke the water would go into the crank case first and pool up. Carboned rings will decrease not increase compression. in the, All Rights Reserved. read more Vince O. Here is a link for two stroke engine air cycle. I tried draining the crankcase with the saw upside . I would never put water in it! If you find the brake drum moving, you must replace the needle bearing. This is because each machine is made differently and has various needs. Check the chain tension and adjust it if it is too loose or tight. 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. It runs good after I get it started. I'm hearing thats just the nature of the beast. 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. It is best to put a new plug in after clearing. "dateModified": "2017-08-17", When the oil pimp or oiler is faulty, it will reduce the chainsaws performance and power. I;ve read somewhere to put water? Get you some Sea Foam at the local auto parts store. 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. The saw feels good in my hands and its got a surprising amount of power. That is what was told to me by the area distributor technician Check for side play in the crankshaft. Cleaned air filters and both were very dirty. I would suspect the timing is too early. 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. NelsGarage will share the knowledge Ive gathered about different tools and give you tips to accomplish your DIY projects faster. There is no carbon build up and all looks like new. Check the choke of the chainsaws engine and make sure it is completely closed.