Hope this helps. The power of the motor of an engine is measured in its capacity. check the cylinder & piston for carbon build-up, how much compression Does the chainsaw Engine need, How To Reset Echo 58-Volt Battery Charger. Wipe off lubricant and grime from the bar with a clean rag. The compression limit should also be doubled if the engine capacity is 100 CC. Make sure the crank taper is clean and the flywheel taper also. When the fuel starts to turn stale, it gums up and clogs the carburetor just as it would in an unused lawnmower. Additionally, most spark plugs come pre-gapped. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Winterizing a pool is an important step in maintaining the longevity and health of your pool. 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. Some of the contributing reasons include a full tank of oil, carbon buildup on the exhaust system, and malfunctioning spark plugs. My one and only MS250 was a kicker to start it but that was the only problem. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. 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've done it to high hour Kohler engines many times. Consequently, always use the right oil and make sure that your chain saws starting mechanism is lubricated to prevent excessive compression while starting the saw. 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. Hold the saw firmly to the ground and crank the engine about four to six times to bleed out the fuel from the combustion chamber. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. Use an adjustable wrench to loosen the two nuts on both sides of the chainsaw. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. A hot engine also requires more compression to convert furl into energy as compared to the colder one. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. Low pressure, 20 to 30 pounds is all you need. A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips. 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. As the starter, spring plays a vital role in running starter assembly smoothly. Cleaned it all up, and had it tuned up. Therefore, it does not need any compression rate to start. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. If repeated cleaning does not fully unclog the carburetor, you will have to replace it. Its just that its nearly impossible to pull. If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. There might be a small stone or thing that is stuck inside the starter and causes the rope not to retract. 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. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. Make sure it is snug but can also move freely by hand. "datePublished": "2017-08-17", 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. Stihl 291 chainsaw too much compression Check the compression of the engine. Then, use a wire brush to remove all the carbon build-up from the cylinder and piston. 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. water will not dissolve carbon; it is far too hard to be effected. This increased distance will cause the chain to keep coming out of the guiding bar with the vibrating saw. Don't know what to do at this point. If you regularly use the chainsaw, then there might be the possibility that your starter spring breaks off. If you do not replace the starter spring on time, it will cause you to replace the whole starter assembly. A drastic and frankly silly thing to do though . What worked with my MS440 kicking problem should also work with that one. Compression gauges are not always accurate and different engines will provide different results. "@id":"https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=toolt&th=435118", Free shipping. The chainsaw has grooves all around the outer edge of the guide bar, and the chain has teeth that run within the bar rail to keep the chain in place and moving straight. If the rails are shallow, you need to replace them. #1. 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. It may not display this or other websites correctly. A chainsaw with no spark will shut down suddenly or not start at all. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. 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. Sometimes the spring stops working correctly due to overuse and becomes brittle. Every chainsaw needs to have some compression to ensure that it operates well. 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. 3 9 9 comments Best Add a Comment Revolutionary-Act469 2 yr. ago Doesn't pull at all or just hard to pull. "@type": "Person", Carboned rings will decrease not increase compression. So be sure to keep your chainsaw properly maintained and avoid compression problems. Always change the spark plug after 100 operating hours of the chainsaw to avoid engine problems. 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. 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. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. . A two-stroke gas-powered chainsaw uses relatively few moving parts. The chain clutch might be, Read More Cordless Chainsaw Wont StartContinue, The most common reason is simply the wrong battery. Activate the chain brake and then place the chainsaw on a flat, leveled surface. 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. no, afraid I don't have equipment to test. It runs good after I get it started. Step 1: Prepare the chainsaw Remove the spark plug from the chainsaw. of compression. Loosen the nuts holding the clutch cover and disconnect the chain shroud and remove the oil plate. 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. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. If it does maybe it is plugged. The extra effort to pull the saw is probably due to carbon build up on the piston crown and combustion chamber. However, if I push downward on the trigger button, it slows down to. 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 You can unclog the carburetor if the clog is minor. So, in our suggestion, one of the first things to check while feeling high compression is the starter spring. Most times, when the Stihl chainsaw stops working, it is never a complete breakdown. Replaced the chain and did some serious cutting and was so pleased. "interactionStatistic": { 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. Make sure the keyway is lined up correctly and tighten the nut down good and tight. Check if the wires are damaged or broken and replace them if necessary. Does the saw have a compression release? . When this pressure, or compression, is too low or high, the chainsaw . Check for broken teeth on the chain and replace them if necessary. Pull trigger and set full choke. Stihl 024 - Sherlock Holmes issue - help needed here. As the chain moves over the bar, it spreads the oil across the moving parts to reduce friction and heat. I used to have a Homelite that would do that if I left gas in it. Every chainsaw engine has a different capacity depending upon its motor power. "dateModified": "2017-08-17", Would have to remove spark plug and rinse cylinder with gas to be able to start. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. JavaScript is disabled. Would have to remove spark plug and rinse cylinder with gas to be able to start. 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. i have a ms 250. 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. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. chain saw compression release mod. 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. Too much carbon will do that, check the piston top and combustion chamber. Youll need to clean the cylinder and piston to fix this thoroughly. Hold the tip of the blade and adjust the tension of the chain correctly. Unscrew the spark plug wrench using a spark plug from the engine. Disconnect the spark plug from the engine and inspect if it is damaged, eroded, or dirty. Blup throttle to bring it down to idle. Ask him if he's drop-starting it. For 503552201 Cylinder Compression Plug Package Include: 3 x Cylinder Plug Cylinder Compression Plug The chain oil will keep the chain lubricated, keep off dirt and allow smooth movement. Check the chainsaws fuel if you have not used the tool for a while. Sometimes an adapter is needed to make a tight fit. Register today and take advantage of membership benefits. It is thus highly recommended that you drain the fuel from your chainsaw if it still has any old gasoline left in it. For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. Find the low speed, high speed, and idle speed screws near the carburetor, start the engine and allow it to warm up. (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 Final step: removing the old spark plug and installing the new one. 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. A cold engine will need the compression of 50-100 PSI whereas a hot engine will require compression above 150 PSI. 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?? This may sometimes jam your chainsaws rings, causing it to become inoperable. Manage Settings It is a prevalent issue and can be fixed and detected easily without consulting a mechanic. After that, using a ratchet, remove the spark plug from the engine. In most cases, a buildup of carbon under the rings presses the rings against the cylinder, culminating in compression of the cylinder. "@type": "ImageObject", 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. "@type": "WebPage", I would suspect the timing is too early. Reddit and its partners use cookies and similar technologies to provide you with a better experience. SPONSORED. The spark plug is located in the engine and ignites the fuel and air mixture, driving the piston and running the engine. If it has damaged parts, replace it with a carburetor kit that fits your chainsaw model. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. I think that's what I'd do. The early 064, 044, 066 came with a red master control. 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. No carbon on top or on roof of cylinder. You may also want to go ahead and replace the plug. 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. When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. 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. If this does not fix the issue, it may be necessary to replace the whole starting rope system with another one. 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. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. Try it, it may just do the trick! "name": "Egbinor" As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. read more Vince O. Does the saw have a compression release? The Stihl chainsaw uses a four-position lever ignition system called the master control lever. 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. Over time or when using the wrong fuel, the fuel filter becomes too clogged and restricts fuel flow, killing the engine shortly after starting. The exhaust side of the piston is a warm gold. Even with new spark plugs in, incorrectly removing and installing the spark plugs can prevent the engine from starting. I've seen a 20psi drop with the wrong type of gauge to be pretty common. "@id": "https://www.yesterdaystractors.com/" If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. Being new carb, wasn't looking that direction educate a non mechanic. Try blowing the crankcase out with air. Carboned rings will decrease not increase compression.