Low pressure, 20 to 30 pounds is all you need. As the chain moves over the bar, it spreads the oil across the moving parts to reduce friction and heat. 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! Hold the tip of the blade and adjust the tension of the chain correctly. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. The piston and rings are very shiney. You never try to get it to run with the choke on. It runs good after I get it started. As long as I can get it going.. in the, All Rights Reserved. Soaking in water will do nothing but rust things up . Turn the engine to get under the piston and blow the crankcase out. "@id": "https://www.yesterdaystractors.com/" I would never put water in it! I have a MS250 that has come up on compression since new. Make sure it is snug but can also move freely by hand. Here is how to troubleshoot a malfunctioning spark plug. A chainsaw is going to be exposed to oxidation over time, but you can at least limit the process by storing your chainsaw well. If a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. after that I'd be looking at crank bearings. I love to write about chainsaw for homeowners and professionals. 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. Oct 24, 2011 / Chainsaw excessive compression #1 . $99.95. JavaScript is disabled. Im Nelson, a DIY enthusiast with a bottomless can-do attitude. how much compression should a Stihl 044 have? - TractorByNet Over time or when using the wrong fuel, the fuel filter becomes too clogged and restricts fuel flow, killing the engine shortly after starting. Get you some Sea Foam at the local auto parts store. Take off the muffler or the carb to get access. 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;ve read somewhere to put water? To ensure correct functioning and to prevent excessive compression, you might have to repair worn-out parts with new ones. Fine adjust everything and both saws start Normal now. Make sure it's greased and the bushings are good. A drastic and frankly silly thing to do though . Carboned rings will decrease not increase compression. water will not dissolve carbon; it is far too hard to be effected. It will be apparent if it is, but usually a scored saw won't run good, if at all. 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. It is usual for the chainsaw chains to come off with continued use, but there is usually an underlying cause when its too repetitive. Remove the air filter, wash it with detergent and water and scrub off the dirt with a brush. } Minimum compression for a Stihl 2 cycle | Lawn Mower Forum The exhaust side of the piston is a warm gold. When there is no air for the spark to ignite, the chainsaw will start and then die after a short while. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. If cleaning does not help release oil onto the bar, the pump may be damaged and require replacing. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. More information can be found on this page. 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. Your ignition rope must be intact properly with the pulley to work correctly. Flooding usually happens due to an underlying issue: a bad spark plug, bad gas, or a faulty carburetor. in the. For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. If it has to do with small engines, it's welcome here. Turn the brake off. I missed the "no carbon". Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. I went with a meteor piston/cylinder set. Stihl recommends using 89 octane gasoline without ethanol, and the gas should not contain more than 10% ethanol. Ok folks, I'm stumped. Try it, it may just do the trick! I hope you understand the problems why your chainsaw is hard to pull. If you suspect a compression issue, seek professional help as compression repairs can be complicated. Check the spark plug and replace it if needed. Why is the Garage Door Opener Light Not Working? Does the saw have a compression release? If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . 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. 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. 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. It is effortless to check the starter spring; pull the ignition rope. Stihl 026 Chainsaw hard to crank - retrofit compression relief valve To clean it, drain the fuel, spray some carburetor cleaner and loosen the residue with a small brush. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. My name is Chris Ross. I think you'll like it. idle. 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. Cleaned it all up, and had it tuned up. Create an account to follow your favorite communities and start taking part in conversations. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. 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. Move the selector lever up one position immediately or the saw will flood on the very next pull. You need to pull the exhaust to check that. 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. Replace the fuel filters instead of cleaning them as they are pretty affordable and easy to install too. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. 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. Replace the spark plug with a new identical. 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. 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. The extra effort to pull the saw is probably due to carbon build up on the piston crown and combustion chamber. You are misunderstanding WHY water is put into carboned up engines. JavaScript is disabled. Try blowing the crankcase out with air. 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. This is because your oil is not rated to get to work at a low temperature. Check for clogging around the bar oil. You can check the compression by pulling the spark plug out and holding it in your hand. Low pressure, 20 to 30 pounds is all you need. MS250 start compression relief stopped working. Keep in mind that the stuck ignition rope can also damaged other parts inside the starter assembly. Versions MS 260, Bar length 37cm, RSC Also, remove the muffler and check for carbon buildup. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Disengage the chain brake, turn on the ignition switch and install the new spark plug into the rubber connector. $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 There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Turn off the choke by pressing the control lever to activate the fast idle. Admitted Woodaholic. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. 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. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Cleaned air filters and both were very dirty. Pull the starter rope and look for a blue spark between the electrode of the spark plug. Read More Chainsaw Primer Bulb Temporary FixContinue, Pull out your battery from the chainsaw, and press the battery button sustainably for a minimum of 5 seconds before you release it. The ignition system is responsible for igniting the fuel and air mixture to produce energy that powers the chainsaw. John Deere and its logos are the registered trademarks of the John Deere Corporation. You should also make sure the new gas you use is appropriate for the chainsaw. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. If this does not fix the issue, it may be necessary to replace the whole starting rope system with another one. Even with new spark plugs in, incorrectly removing and installing the spark plugs can prevent the engine from starting. 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. Stihl 251 chainsaw. Get you some Sea Foam at the local auto parts store. 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. It was easier to pull after I cleaned it up, but still tough. I get it going now and its easier but its still a bear. I would never put water in it! The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. Stihl MS250 Too High of Compression? - Arborist, Chainsaw & Tree Work Forum Find the low speed, high speed, and idle speed screws near the carburetor, start the engine and allow it to warm up. Does the saw have a compression release? If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. Hello. "@type": "ImageObject", If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. 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. It's an older saw I bought at a garage sale. Try it, it may just do the trick! 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. I hook up a drill to the nut on the clutch and start hard starting saws that way . Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. { For a better experience, please enable JavaScript in your browser before proceeding. That is the nature of a 250. Make sure the gap is according to the specifications of your chainsaws engine. It can be from something as simple as starting the chainsaw wrongly to more severe issues like a damaged carburetor. A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips. Keep in mind that good maintenance and storage will reduce breakdowns and maintain your tools performance throughout its lifetime. Therefore, most people will wonder why the chainsaw has too much compression. It's also possible the piston or cylinder are scored or carboned up. This may sometimes jam your chainsaws rings, causing it to become inoperable. A highly compressed engine will not be able to work smoothly because of the too much pressure on engine and you will find it hard to start the engine. If it does maybe it is plugged. "author": { "interactionStatistic": { This could be understood by reading the further explanation below. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. 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. Pull trigger and set full choke. Pour starting fluid into the carburetor and crank the engine several times. Every chainsaw requires a different compression level according to its built-up and model number. The first step is to remove the cover that covers the spark plug on your chainsaw. It would give you rusted bearings. When the engine starts running, turn the choke off. 24" is what I've got on mine, but it can handle a bigger bar. I bought 2 032 Stihl saws at auction that pulled very hard. If you still have questions regarding high chainsaw compression, you can discuss them in the comments. Also take the spark plug out and do the same. MS 260 - Robust chainsaw for forestry work - Stihl Below we have discussed the most common reasons why your chainsaw wont idle and the best way to fix it. Then Google decarb . 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 manual for this model, and the parts breakdown, show a compression release valve. 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. An engine is fit on the rear side of a chainsaw. Typically, several reasons cause too much compression in a chainsaw and these include but are not limited to: Old contaminated chainsaw fuel Chainsaw Starter rope issues Faulty spark plugs Chainsaw Carbon buildup Insufficient Chainsaw Oil Old and contaminated fuel Sounds flooded, or maybe wrong sparkplug? Spark plugs that are not functioning properly are another probable cause of excessive compression. $49.99. It is harmful to your machine to use old fuel. Also take the spark plug out and do the same. Carboned rings will decrease not increase compression. Detailed, well-researched, and accurate home and garden information presented in an understandable format is our primary goal. I used to have a Homelite that would do that if I left gas in it. If the air filter is too clogged, you should replace it. The early 064, 044, 066 came with a red master control. 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. Stihl Chainsaw Ms170 for sale | eBay I have plenty of engines with REALLY low compression that I'll be glad to swap him. High compression in chainsaws is a dangerous problem that can lead to serious injuries. Get it ported and it brings it to another level. Fine adjust everything and both saws start Normal now. Dont substitute it with. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. Manage Settings Small Engine Technician SPONSORED. 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 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. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. 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. So, If you feel too much compression while pulling a chainsaw, the possible reasons might be as below. However, if I push downward on the trigger button, it slows down to. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. 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. That is the nature of a 250. Even though it was purchased "brand new" I'm not so sure. Locate the tension adjustment screws to the side of the chainsaw guide bar. That model is extremely easy to flood. Similarly, a 4-stroke engine needs 2 times more compression than a 2-stroke engine, around 180-210 PSI. Clean any mildly dirty parts and replace all the damaged parts. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. This is because each machine is made differently and has various needs. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. 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. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. The vibration of the tool during use can run some fasteners loose, preventing it from starting again. Quoting Removed, click Modern View to see What?? Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. Wipe off any dirt and debris and check for any signs of damages. I would never put water in it! Unscrew the clutch assembly on top of the oil pump. Compression gauges are not always accurate and different engines will provide different results. If it does maybe it is plugged. 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. Help, can't pull start Stihl MS250 chainsaw, too much compression. Welcome! When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. You may also notice that the chain saw loses power during operation. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. Ron Cook. 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. "headline":"Chainsaw has too much compression", 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. When you start the chainsaw, it triggers the worm drive to engage the oiler to send oil through a port that releases onto the bar. When the motor warms up after about a minute, turn on the choke position. Check the chain tension and adjust it if it is too loose or tight. I think that's what I'd do. It is typical for the Stihl chainsaw to develop some issues, and when this happens, some basic troubleshooting will help identify the source of the issue and solution to help it run smoothly.