To test the recoil starter, remove it and reposition the spring. I would never put water in it! He checked.it clearly says that in the OP. 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. However, the compression also has a limitation because a very high or very low compression will cause problems and prevent your chainsaw from operating efficiently. You can clean and mildly clogged carburetor but if it is too severe, replace it with one compatible with your chainsaw model. If the compression is not produced in the engine at an appropriate level, it will not be able to convert fuel into energy. in the cylinder overnight because the rings are cerboned up? 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. It runs good after I get it started. This site is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. "mainEntityOfPage": { Keep in mind that good maintenance and storage will reduce breakdowns and maintain your tools performance throughout its lifetime. Too much carbon will do that, check the piston top and combustion chamber. If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. MS 260 - Robust chainsaw for forestry work - Stihl Use recommedend chain oil lubricant. 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. Your chainsaws compressive strength is measured with the use of a screw-in gauge. "@type":"DiscussionForumPosting", Remove the sprocket and the washer. Manage Settings Carboned rings will decrease not increase compression. The second thing, Read More Stihl Chainsaw Charger Not WorkingContinue, Your email address will not be published. The plug should be tight against your thumb. John Deere and its logos are the registered trademarks of the John Deere Corporation. Are you sure the starter rope isn't a little too short? 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. "datePublished": "2017-08-17", 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. 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 Generally covering everything under 25 HP. The consent submitted will only be used for data processing originating from this website. It's an older saw I bought at a garage sale. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. 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. 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. If oil is in there it is what makes the engine feel like it is almost locked up. Yes I tried that last time and it did help some. what and or where is the metering lever.? The spark plug is located in the engine and ignites the fuel and air mixture, driving the piston and running the engine. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. or Best Offer. It would give you rusted bearings. You are misunderstanding WHY water is put into carboned up engines. Wipe off the excess fuel from the spark plug with a clean rag. Would not be afraid to do it to a 4, 6, or V-8. The saw is about 2 years old, light use. "text": "My chainsaw has gotten very hard to pull the rope. Hello EGBinOR, I will also add that if you have points, then the wrong gap will alter the point of ignition and can have the same results, Guido. Check the choke of the chainsaws engine and make sure it is completely closed. Some of the contributing reasons include a full tank of oil, carbon buildup on the exhaust system, and malfunctioning spark plugs. Get you some Sea Foam at the local auto parts store. 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. That is what was told to me by the area distributor technician Check for side play in the crankshaft. Turn the idle speed clockwise until the saw idles and chain turns, and then make a one-fourth counterclockwise turn. Required fields are marked *. Back to top derwen1959 Long Time User You can use a ratchet to do the task. Check if the wires are damaged or broken and replace them if necessary. The saw runs and starts great. The carburetor is a significant part of the chainsaw. 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 hope you understand the problems why your chainsaw is hard to pull. Take better care of your chainsaw and perform regular maintenance according to the manufacturers recommendations to prevent any of these problems. Don't know what to do at this point. Hello. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Start new topic; Recommended Posts. The following have been addressed. A chainsaw Battery blinking red is one of the most frustrating things a woodcutter can, Read More How To Fix Chainsaw Battery Charger Blinking Red?Continue, The standard compression reading required for most 2-cycle chainsaw is around 100-110 psi to start. If cleaning does not help release oil onto the bar, the pump may be damaged and require replacing. "@type": "WebPage", Although this is often true, it is not always the case. If repeated cleaning does not fully unclog the carburetor, you will have to replace it. water will not dissolve carbon; it is far too hard to be effected. It's from not pulling hard enough. My one and only MS250 was a kicker to start it but that was the only problem. If the chainsaw is too little compression, it may start easily but will not run smoothly. 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. That is a high compression saw, pull the rope slowly until you feel resistance then give it a short quick pull. . Pour starting fluid into the carburetor and crank the engine several times. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. The manual for this model, and the parts breakdown, show a compression release valve. That model is extremely easy to flood. Use a can of carb cleaner sprayed into the breather/filter assembly. "@id":"https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=toolt&th=435118", Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. As the starter, spring plays a vital role in running starter assembly smoothly. $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 no, afraid I don't have equipment to test. "height": 57 In addition, you should check the muffler and piston while youre at this point. }, How Much Compression Should A Chainsaw Have - Toolsadvisorpro Advanced arborist chainsaw with a top handle and STIHL M-Tronic technology. Another big issue that causes too much high compression is the lack of oil in the starter system. "@type": "Organization", As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Take off the muffler or the carb to get access. Do that to the starter side when you're looking at the starter assy. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. We got rid of both of those useless things . To clean it, drain the fuel, spray some carburetor cleaner and loosen the residue with a small brush. Any help out thereEGBinOR Get you some Sea Foam at the local auto parts store. I think that's what I'd do. Winterize Your Pool Like a Pro: A Comprehensive Guide for Home owners. However, if I push downward on the trigger button, it slows down to. Also take the spark plug out and do the same. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. 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. 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. The early 064, 044, 066 came with a red master control. } Check the chain oiler and ensure it is functional. Even though it was purchased "brand new" I'm not so sure. Winterizing a pool is an important step in maintaining the longevity and health of your pool. Chainsaw Too Much Compression: Causes & Solution As far as compression, you can usually tell by how the saw pulls when starting it. in the, All Rights Reserved. Im Nelson, a DIY enthusiast with a bottomless can-do attitude. When starting the motor when its col, you should engage the choke position to increase fuel intake and reduce air to allow the engine to start. 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. Being in the cutting services for more than 10 years, I know a thing or two about chainsaw. Each chainsaw has a different level of compression. 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. 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. Stihl MS 250 C Compression Release - lilredbarn.net If a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. 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 bought 2 032 Stihl saws at auction that pulled very hard. Low pressure, 20 to 30 pounds is all you need. After initial pull on rope (which feels like vapor lock on cylinder), saw will start on second or third pull. Try blowing the crankcase out with air. Can also be used with hedge trimmer attachment HS 246. Also check the air filters and make sure they are clean. Without proper compression, the engine will not be able to suck and use the fuel for combustion. Check the electrode gap of the spark plug and ensure it is 0.02 inches. 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. $49.99. Quoting Removed, click Modern View to see Don't put water in the saw-ever. I love to write about chainsaw for homeowners and professionals. Don't know what to do at this point. A 50CC engine needs 150 PSI compression. ", When the motor warms up after about a minute, turn on the choke position. I hook up a drill to the nut on the clutch and start hard starting saws that way . If the chainsaw still wont start, it is defective and requires a replacement. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. Stihl is a leading manufacturer of chainsaws and other handheld outdoor and landscaping power tools. Small Engine Technician If you buy another battery, make sure it has the same voltage and amperage as the old battery. I hook up a drill to the nut on the clutch and start hard starting saws that way . Try it, it may just do the trick! I get it going now and its easier but its still a bear. "image": { Stihl 026 Chainsaw hard to crank - retrofit compression relief valve Your ignition rope must be intact properly with the pulley to work correctly. 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. It can be from something as simple as starting the chainsaw wrongly to more severe issues like a damaged carburetor. anthonyg_ma Original Author 16 years ago Canguy, thnks for the tips! There might be a small stone or thing that is stuck inside the starter and causes the rope not to retract. Turn off the choke by pressing the control lever to activate the fast idle. 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. Make sure it is snug but can also move freely by hand. 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! Cleaned air filters and both were very dirty. I got it started. Sometimes, the ignition rope is frayed or stuck inside the starter housing. Dont substitute it with. Cleaned air filters and both were very dirty. Make sure there is oil in the engine. If it has damaged parts, replace it with a carburetor kit that fits your chainsaw model. Thanks! As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Stihl MS250 Too High of Compression? - Arborist, Chainsaw & Tree Work Forum Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. 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. If this does not fix the issue, it may be necessary to replace the whole starting rope system with another one. It's also possible the piston or cylinder are scored or carboned up. If there is any damage to the pulley at any stage, it will cause High Compression or stiffness during a pull.. I changed to synthitic. High compression in chainsaws is a dangerous problem that can lead to serious injuries. Youll need to clean the cylinder and piston to fix this thoroughly. Sparkplug was correct but I think it was a little flooded. Try taking it out, Then holding the trigger while you pull fast. What Causes Too Much Compression on Poulan Chain Saws? Once the 250 is running, its fine. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) 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. 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. The first step is to remove the cover that covers the spark plug on your chainsaw. Stihl 024 - Sherlock Holmes issue - help needed here. We're all about fixing small engines, from carburetor rebuilds, to crankshaft machining. My name is Chris Ross. Also check the air filters and make sure they are clean. On a 2 stroke the water would go into the crank case first and pool up. Clean any mildly dirty parts and replace all the damaged parts. I've done it to high hour Kohler engines many times. It is best to put a new plug in after clearing. water will not dissolve carbon; it is far too hard to be effected. Once youve done that, reassemble the chainsaw, which should work properly again. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. 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. In a similar vein, if the wrong kind of oil is used, the compression may be increased. I tried draining the crankcase with the saw upside . I hook up a drill to the nut on the clutch and start hard starting saws that way . 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. Once it's removed, you can place a gauge on the place of the spark plug. Generally the minimum is 110 lbs. Subsequent starts are just as hard. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. The chain oil will keep the chain lubricated, keep off dirt and allow smooth movement. After that, using a ratchet, remove the spark plug from the engine. Create an account to follow your favorite communities and start taking part in conversations. "description":"Discussion of Chainsaw has too much compression in the Tool Talk forum followed by comments. Of all the Stihl saws, the MS250 is the toughest to start in relation to it's size. Create an account to follow your favorite communities and start taking part in conversations. I've seen a 20psi drop with the wrong type of gauge to be pretty common. The exhaust side of the piston is a warm gold. of compression. Obviously, the motor, which has a huge capacity, will require more compression. Ivor from uk here and I have a stihl chainsaw and when I am hedge laying or pletching as it is called the saw only runs for 15 or 20 seconds or perhaps 1 minute at the most if there is a big cut to make the spark plug tip builds up with carbon,i use proper 2 stroke oil at a ratio of 25to1 does any pletching or hedge laying go on across the pond?? 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. Activate the chain brake and then place the chainsaw on a flat, leveled surface. Stihl chainsaw low compression diagnoses and How To - YouTube Too much hot or cold engine does not work or even start to produce vacuum pressure inside engine. I can probably find one with at most 65 PSI. Lift the bars nose and tighten the nuts on the sidebar to secure the sidebar and guide bar in place. It was metering lever. Carboned rings will decrease not increase compression. Pull the starter rope until you hear the first sign of it firing with a small burp. Stihl chainsaw compression test | Bob Is The Oil Guy That is the nature of a 250. Quoting Removed, click Modern View to see Don't put water in the saw-ever. Cleaned air filters and both were very dirty. Any ideas? The vibration of the tool during use can run some fasteners loose, preventing it from starting again. Step 1: Prepare the chainsaw Remove the spark plug from the chainsaw. Move the selector lever up one position immediately or the saw will flood on the very next pull. I'll even do the labor for free. The choke position is the fourth setting on the master control lever. I would never put water in it! However, you still have to confirm the size of the gap before installing. A drastic and frankly silly thing to do though . How Much Compression Should a Stihl 066 Have? - SFGATE Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. My chainsaw has gotten very hard to pull the rope. 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. "@id": "https://www.yesterdaystractors.com/" Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. Chainsaw has too much compression - Yesterday's Tractors If you could start an engine with the choke closed and not turn off the choke on time, you will end up flooding the engine with too much gas. Also, remove the muffler and check for carbon buildup. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. If the chainsaw is too much compression, it may be difficult to start. A hot engine also requires more compression to convert furl into energy as compared to the colder one. Block the spark plugs hole by putting a nylon rope to prevent the piston from moving. If you still have questions regarding high chainsaw compression, you can discuss them in the comments. 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. Fine adjust everything and both saws start Normal now. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. Try blowing the crankcase out with air. "width": 200, 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. Stihl MS250 hard to pull? in Chainsaws - The Forestry Forum or Best Offer. I would suggest clearing the cylinder by pulling the rope with the plug out. Get it ported and it brings it to another level. 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! Has someone invented a new kind of two stroke motor? 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. Sometimes the spring stops working correctly due to overuse and becomes brittle. The Stihl 066 chainsaw uses the same type of engine most gasoline-powered yard tools use, a two-cycle combustion engine. The starter assembly often fails to rotate due to a weak connection between the pulley and the ignition rope. read more Vince O. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . Sometimes it kicks and the rope pulls right out of my hand. A heavy-duty engine gets hot faster and works better than a cold engine. 4 Possible Problems & Solutions Problem 1: Damaged starter housing Solution: 1. Final step: removing the old spark plug and installing the new one. If you are trying to start your chainsaw in winter and the oil you used for the chainsaw assembly is not suitable for the winter season, you also feel high compression. 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. When there is no air for the spark to ignite, the chainsaw will start and then die after a short while. Not sure it would accomplish anything on a 2-stroke chain saw engine. NelsGarage.com All Rights Reserved 2021 Theme: Prefer by, Stihl Chainsaw Troubleshooting & How-to Guide. Is the spark plug the correct one for the saw? "@type": "ImageObject", And some will have more. 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. The excess gas can be cleared simply by removing the plug and operating the starter a few times. Ron Cook. So, replacing the ignition rope is a better option to keep everything working smoothly without any damage. Check the chain tension and adjust it if it is too loose or tight. Turn the engine to get under the piston and blow the crankcase out. This is because each machine is made differently and has various needs. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. water will not dissolve carbon; it is far too hard to be effected. 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. How to Reprogram a Chamberlain Garage Door Opener, How to Program a Universal Garage Door Opener, Toro Lawnmower Troubleshooting & How To Guide, Bostitch Nail Gun Troubleshooting & How to Guide. 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 oil is in there it is what makes the engine feel like it is almost locked up. Would have to remove spark plug and rinse cylinder with gas to be able to start. It does not take much to increase the compression. I used to have a Homelite that would do that if I left gas in it. 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. Does the saw have a compression release? The key on the flywheel is in place and not sheered.