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. Make sure it's greased and the bushings are good. Too much hot or cold engine does not work or even start to produce vacuum pressure inside engine. Then Google decarb . 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. To ensure that enough air reaches the chain saw's engine, remove the air filter and clean or replace it, depending on the manufacturer's instructions. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. It runs good after I get it started. Pull the rope until it starts. Would have to remove spark plug and rinse cylinder with gas to be able to start. How Much Compression Should a Chainsaw Have. Try taking it out, Then holding the trigger while you pull fast. I tried draining the crankcase with the saw upside . The saw feels good in my hands and its got a surprising amount of power. Most Stihl chainsaws have a resistance of 0.2-3.0 ohm on the primary coil and 5-20 kiloohm on the secondary coil but always confirm the correct reading for your model number. I used to have a Homelite that would do that if I left gas in it. Also, remove the muffler and check for carbon buildup. Any ideas? Once youve done that, reassemble the chainsaw, which should work properly again. If repeated cleaning does not fully unclog the carburetor, you will have to replace it. The Pulley compartment plays a massive role in retracting the ignition rope. Several reasons can cause your Stihl chainsaw to bog down when your pull the trigger. 1. saw has new carb 2. flywheel has been removed and key inspected. 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. in the. Guido Quoting Removed, click Modern View to see What?? Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. Make sure it fits snug. Pull trigger and set full choke. "@context":"https://schema.org", If it does maybe it is plugged. You are misunderstanding WHY water is put into carboned up engines. Temperature Of The Engine A heavy-duty engine gets hot faster and works better than a cold engine. Can anyone make a suggestion. 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. 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. If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. A faulty spark plug will have carbon, dirt, and oil blocking the insulator nose, preventing it from firing consistently. Does the saw have a compression release? If a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. 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. If any of these components are worn or broken, the chain saw wont start even with fuel. Replace with a new starter house Problem 2: Damaged pulley system Solution: 1. If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. My first chain saw was an old Homelite EZ with a blue metal case and a 20" bar. Make sure you have a gauge with a schrader valve right at the tip of the spark plug adapter or you will get a low reading every time. If the spark plug is too corroded or the electrode is faulty, it cannot create an electrical current to start the system. 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 build-up in cylinder & piston, bad needle bearing, overused starter spring, oil in the starter system, old or bad fuel, etc can cause too much compression in Chainsaws. 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. }, A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. You should also make sure the new gas you use is appropriate for the chainsaw. We have explained the most effective way to unflood a chainsaw engine below. Press question mark to learn the rest of the keyboard shortcuts. Generally covering everything under 25 HP. It does not take much to increase the compression. As long as I can get it going.. Stihl MS192T Chainsaw Fuel Oil Tank Engine Housing Assembly OEM. Soaking in water will do nothing but rust things up . The purpose of a choke in a chainsaw is to make cold starting more effortless, but if you do not use it properly. Sometimes it kicks and the rope pulls right out of my hand. So, If you feel too much compression while pulling a chainsaw, the possible reasons might be as below. If you suspect a compression issue, seek professional help as compression repairs can be complicated. Activate the chain brake and then place the chainsaw on a flat, leveled surface. Check for dirty fuel tanks, clogged fuel filters, loose pipes, clogged air filters, and a dirty carburetor, which can all the fuel volume going into the combustion chamber. If the rails are shallow, you need to replace them. If A two cycle engine gets flooded BADLY, oil can separate from the gas mix, accumulate in the crankcase and creates an hydrostatc lock. You will notice the compression less. 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?? When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. Why is the Garage Door Opener Light Not Working? 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. You will notice the compression less. First, remove the cylinder and piston from the chainsaw. The extra effort to pull the saw is probably due to carbon build up on the piston crown and combustion chamber. OEM GOOD USED STIHL 048AV CHAINSAW SHORT BLOCK ENGINE 120 PSI COMPRESSION. It is thus highly recommended that you drain the fuel from your chainsaw if it still has any old gasoline left in it. Generally the minimum is 110 lbs. Chainsaws are very powerful tools, and if theyre not properly maintained, they can easily overcompress the chain, which can cause it to break. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Help, can't pull start Stihl MS250 chainsaw, too much compression. Unscrew the spark plug using a ratchet and screw the compression gauge in its place. This is bad practice, and can damage your chainsaw. Also take the spark plug out and do the same. As far as compression, you can usually tell by how the saw pulls when starting it. Carbon buildup is yet another important factor in the increasing compression experienced by chain saws over time. It would give you rusted bearings. $75.00. Likewise, low compression in the engine will be slow and retarding and it is a warning sign of leakage in your engine. Take off the muffler or the carb to get access. link to Winterize Your Pool Like a Pro: A Comprehensive Guide for Home owners. This could be understood by reading the further explanation below. Blup throttle to bring it down to idle. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", "@id":"https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=toolt&th=435118", Any chance is it hydro locking because of gas? Turn the engine to get under the piston and blow the crankcase out. I've seen a 20psi drop with the wrong type of gauge to be pretty common. As the chain moves over the bar, it spreads the oil across the moving parts to reduce friction and heat. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Suitable Replacement Stihl MS 250 C Compression Release Parts I got it started. 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. Remove the right side cover, bar, and chain. 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. If the compression is not produced in the engine at an appropriate level, it will not be able to convert fuel into energy. Obviously, the motor, which has a huge capacity, will require more compression. 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. After initial pull on rope (which feels like vapor lock on cylinder), saw will start on second or third pull. 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. You never try to get it to run with the choke on. Please use the navigational links to explore our website. If it looks physically fine after cleaning it and you havent changed it in a few seasons, you should still replace it. Replaced the chain and did some serious cutting and was so pleased. Follow the steps below on how to fix a flooded chainsaw engine. Ok folks, I'm stumped. Continue with Recommended Cookies. I've seen it happen a couple times. It is harmful to your machine to use old fuel. Would not be afraid to do it to a 4, 6, or V-8. You will notice the compression less. STIHL MS 170 Chainsaw (NEW) full pack $295.00 $59.00 shipping Stihl MS170 Chainsaw Motor Fast Free Shipping $75.00 Free shipping or Best Offer Stihl 16 inch bar + Chain for MS170 - MS251 3/8 Pitch .043 Gauge 55 drivers $79.75 $25.45 shipping Only 3 left Stihl MS170 Chainsaw motor OEM Fast/Free Shipping $85.00 Free shipping or Best Offer "@type":"DiscussionForumPosting", "@type": "Organization", I've been working on a Stihl 026 chainsaw that John found, and it is very hard to crank. 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. Try it, it may just do the trick! We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Try it, it may just do the trick! Just wondering what your opinions are of the lowest compression you can run a Stihl MS250 at. The plug should be tight against your thumb. If it has damaged parts, replace it with a carburetor kit that fits your chainsaw model. Register today and take advantage of membership benefits. All it needs is a few inches missing and it will pull too hard like the compression is too high. What is the minimum compression for my STIHL chainsaw? 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. The compression limit should also be doubled if the engine capacity is 100 CC. 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. The lack of oil dries the chainsaw assembly, which causes high compression and becomes very difficult for you to handle the chainsaw. Most times, when the Stihl chainsaw stops working, it is never a complete breakdown. The flywheel is loose? $99.95. Carboned rings will decrease not increase compression. Unscrew the spark plug wrench using a spark plug from the engine. The chain oil will keep the chain lubricated, keep off dirt and allow smooth movement. Guido 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. 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. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. Pull trigger and set full choke. Each chainsaw has a different level of compression. My /Sthil 034 is very difficult to start. The power of the motor of an engine is measured in its capacity. It's an older saw I bought at a garage sale. On a 2 stroke the water would go into the crank case first and pool up. What usually happens is that the guide bar gets stuck in the tree and they keep running the engine while trying to force the bar out of the tree somehow. In other words, the problem is in the trigger itself, not a. carb adjustment screw. All it needs is a few inches missing and it will pull too hard like the compression is too high. We will explain the causes of high compression and how you can quickly fix it to make it run smoothly. 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. I've done it to high hour Kohler engines many times. Pour starting fluid into the carburetor and crank the engine several times. 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.. When there is no air for the spark to ignite, the chainsaw will start and then die after a short while. Here is how to troubleshoot a malfunctioning spark plug. 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. Turn the engine to get under the piston and blow the crankcase out. I got it going. Has someone invented a new kind of two stroke motor? Stihl 251 chainsaw. If you still want to try and get carbon out of the saw either take it apart and clean it or use something along the lines of sea foam. Always change the spark plug after 100 operating hours of the chainsaw to avoid engine problems. It is possible however to flood a two stroke which can cause the plug to fowl. Change in temperatures and dirt will cause clogging anywhere the oil passes, and this can prevent the oil from spread all across the bar. #1. 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 get it going now and its easier but its still a bear. 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. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. "@type": "Person", That is the nature of a 250. The following have been addressed. Normally it's not a problem but if it was already difficult to pull it could be. 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. Pull the starter rope and look for a blue spark between the electrode of the spark plug. It can be from something as simple as starting the chainsaw wrongly to more severe issues like a damaged carburetor. lol. Make sure it's greased and the bushings are good. The Stihl chainsaw uses a four-position lever ignition system called the master control lever. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. Register today and take advantage of membership benefits. Check the chain tension and adjust it if it is too loose or tight. The engine creates a vacuum pressure inside it. Don't put water into the 2 stroke. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. Below we have discussed the most common reasons why your chainsaw wont idle and the best way to fix it. It was metering lever. . The chain clutch might be, Read More Cordless Chainsaw Wont StartContinue, The most common reason is simply the wrong battery. 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. Also take the spark plug out and do the same. I would suggest clearing the cylinder by pulling the rope with the plug out. You are using an out of date browser. 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? Don't put water into the 2 stroke. Sounds like it was broken in "right", show the guy how to start it and tell him to be happy. Every chainsaw requires a different compression level according to its built-up and model number. 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?? Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. It is a prevalent issue and can be fixed and detected easily without consulting a mechanic. Most fuels nowadays are a blend of ethanol which attracts moisture and speeds up the rotting process. The compression limit should also be doubled if the engine capacity is 100 CC. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . That is what was told to me by the area distributor technician. When the oil pimp or oiler is faulty, it will reduce the chainsaws performance and power. 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. 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. Keep in mind that good maintenance and storage will reduce breakdowns and maintain your tools performance throughout its lifetime. A smaller gap will cause a weak spark and poor ignition of the engine, while a wider gap will not bring out any spark. Therefore, most people will wonder why the chainsaw has too much compression. Don't know what to do at this point. Check the spark plug and replace it if needed. Would not be afraid to do it to a 4, 6, or V-8. Not sure it would accomplish anything on a 2-stroke chain saw engine. Recognised as a leading saw in the forestry industry, it is available in guide bar lengths 13"/32cm to 18"/45cm. 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. When there is too much fuel, it will not ignite, and the engine wont start. When this pressure, or compression, is too low or high, the chainsaw . I have a MS250 that has come up on compression since new. You're familiar with how to start a stihl yes? None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. Pull the starter rope until you hear the first sign of it firing with a small burp. Use an adjustable wrench to loosen the two nuts on both sides of the chainsaw. 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. A drastic and frankly silly thing to do though . Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. Your chainsaws compressive strength is measured with the use of a screw-in gauge. It will be apparent if it is, but usually a scored saw won't run good, if at all. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. Whether you are a beginner or a professional woodworker, knowing how to fix your chainsaw will save you time and money seeking help from a service center. 4 Possible Problems & Solutions Problem 1: Damaged starter housing Solution: 1. Flooding usually happens due to an underlying issue: a bad spark plug, bad gas, or a faulty carburetor. Any ideas? "@type": "InteractionCounter", Are you sure the starter rope isn't a little too short? I'm an arborist by profession & a blogger by passion. Its just that its nearly impossible to pull. A clogged carburetor wont allow fuel into the engine, preventing it from starting. A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. Versions MS 260, Bar length 37cm, RSC Every chainsaw engine has a different capacity depending upon its motor power. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. We describe all the possible issues and also suggest the solutions to fix them too. "@type": "ImageObject", 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. Other than damaged parts, using the choke position to start a warm saw often causes a flooded engine. I would never put water in it! If oil is in there it is what makes the engine feel like it is almost locked up. Keep in mind that the stuck ignition rope can also damaged other parts inside the starter assembly. Yeah, I must have flooded it as I was working on it. If the air filter is too clogged, you should replace it. Im Nelson, a DIY enthusiast with a bottomless can-do attitude. Press J to jump to the feed. The starter assembly often fails to rotate due to a weak connection between the pulley and the ignition rope. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Back to top derwen1959 Long Time User Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. Don't put water into the 2 stroke. If so, show him how to start it on the ground with his foot in it or with the rear handle between his thighs. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. Similarly, a 4-stroke engine needs 2 times more compression than a 2-stroke engine, around 180-210 PSI. Here is a link for two stroke engine air cycle. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. 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. If you still have questions regarding high chainsaw compression, you can discuss them in the comments. NelsGarage.com All Rights Reserved 2021 Theme: Prefer by, Stihl Chainsaw Troubleshooting & How-to Guide. If it is too damaged, you should replace it. It's also possible the piston or cylinder are scored or carboned up. Lift the bars nose and tighten the nuts on the sidebar to secure the sidebar and guide bar in place. If it is not physically damaged, clean it with clean gasoline and a rag. The ignition system is responsible for igniting the fuel and air mixture to produce energy that powers the chainsaw. That is a high compression saw, pull the rope slowly until you feel resistance then give it a short quick pull. Thanks. A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips. in the, All Rights Reserved. It is, therefore, necessary to determine if the problem has been remedied by adding fresh fuel. after that I'd be looking at crank bearings. The spark arrestor in a chainsaw traps exhaust products emitted from an internal combustion engine. It was easier to pull after I cleaned it up, but still tough. 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. I hook up a drill to the nut on the clutch and start hard starting saws that way . If the reading is below or above the required range, then your ignition coil requires changing. People sometimes try to cut down a tree that is too big for their chainsaw. I usual only choke my MS250 for one pull and no longer have the flooding issue. A hot engine also requires more compression to convert furl into energy as compared to the colder one. link to Indoor Fly Traps: 5 Things You Didn't Know About Indoor Fly Traps. Are you sure the starter rope isn't a little too short? 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. I bought it used around 1978. 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. Disconnect the spark plug from the engine and inspect if it is damaged, eroded, or dirty. No carbon on top or on roof of cylinder. water will not dissolve carbon; it is far too hard to be effected. No compression when pulling start rope read more Expert Stihl ms 180 chain saw, new carb, spark plug, compression stihl ms 180 chain saw, new carb, spark plug, compression 110, new gas, still won't start what next, piston is not scored.

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