Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? Similarly, a 4-stroke engine needs 2 times more compression than a 2-stroke engine, around 180-210 PSI. Don't know what to do at this point. Each chainsaw has a different level of compression. Use of this Web site constitutes acceptance of our. I have a MS250 that has come up on compression since new. The piston and rings are very shiney. That is what was told to me by the area distributor technician Check for side play in the crankshaft. Winterizing a pool is an important step in maintaining the longevity and health of your pool. This compression converts fuel (any source) into the potential energy in the engine to start it. Then Google decarb . Turn the engine to get under the piston and blow the crankcase out. Make sure it's greased and the bushings are good. If not I'm honestly kinda stumped. As the starter, spring plays a vital role in running starter assembly smoothly. Make sure it fits snug. 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. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) Hello D beatty, Here is a link for two stroke engine air cycle, Guido. 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. I used to have a Homelite that would do that if I left gas in it. It's from not pulling hard enough. Of all the Stihl saws, the MS250 is the toughest to start in relation to it's size. The exhaust side of the piston is a warm gold. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. The vibration of the tool during use can run some fasteners loose, preventing it from starting again. idle. If it looks physically fine after cleaning it and you havent changed it in a few seasons, you should still replace it. Didnt somehow get straight oil in the cylinder did you? This could be understood by reading the further explanation below. 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. 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. You are misunderstanding WHY water is put into carboned up engines. Dont substitute it with. Although this is often true, it is not always the case. Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. After initial pull on rope (which feels like vapor lock on cylinder), saw will start on second or third pull. }, I would suspect the timing is too early. How big a fella are ya? Remove the spark plug with a spark plug wrench and clean it with a brush to remove carbon scoring and dirt. If it is too damaged, you should replace it. Could your gauge be off a little? To clean it, drain the fuel, spray some carburetor cleaner and loosen the residue with a small brush. 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. It would give you rusted bearings. The exhaust is black but no build up. Make sure the keyway is lined up correctly and tighten the nut down good and tight. Flooding usually happens due to an underlying issue: a bad spark plug, bad gas, or a faulty carburetor. Don't put water into the 2 stroke. This increased distance will cause the chain to keep coming out of the guiding bar with the vibrating saw. You will notice the compression less. It is harmful to your machine to use old fuel. That is what was told to me by the area distributor technician. Quoting Removed, click Modern View to see What?? Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. Does the saw have a compression release? Also take the spark plug out and do the same. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. If this does not fix the issue, it may be necessary to replace the whole starting rope system with another one. 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. Thank you for the responses. chain saw compression release mod. If the reading is below or above the required range, then your ignition coil requires changing. A compression gauge is used to measure the compression of a chainsaw which works similarly to the tire gauge. Would not be afraid to do it to a 4, 6, or V-8. The spark arrestor in a chainsaw traps exhaust products emitted from an internal combustion engine. Don't put water into the 2 stroke. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. Every chainsaw requires a different compression level according to its built-up and model number. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. Spark plugs that are not functioning properly are another probable cause of excessive compression. Here is how to troubleshoot a malfunctioning spark plug. "interactionStatistic": { 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. 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. You can follow the steps on how to troubleshoot and revive it when it wont start. It uncoils, tightens the spring, engages the clutch to start the engine. I think that's what I'd do. It is thus highly recommended that you drain the fuel from your chainsaw if it still has any old gasoline left in it. Quoting Removed, click Modern View to see Don't put water in the saw-ever. Would not be afraid to do it to a 4, 6, or V-8. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. $49.99. On a 2 stroke the water would go into the crank case first and pool up. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. Starter fluids spray can help in those conditions Before pulling shoulder. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. anthonyg_ma Original Author 16 years ago Canguy, thnks for the tips! What are the numbers on your sparkplug? 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. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. Check for clogging around the bar oil. It is best to put a new plug in after clearing. Make sure there is oil in the engine. Being new carb, wasn't looking that direction educate a non mechanic. 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. He checked.it clearly says that in the OP. Block the spark plugs hole by putting a nylon rope to prevent the piston from moving. after that I'd be looking at crank bearings. Activate the chain brake and then place the chainsaw on a flat, leveled surface. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. I'm hearing thats just the nature of the beast. Check the chainsaws fuel if you have not used the tool for a while. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. I'll even do the labor for free. You are using an out of date browser. 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. "@type": "Organization", You may also want to go ahead and replace the plug. 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. Uninstall the spark arrestor and unblock it using a brush, but you can also replace it for efficiency. Also, remove the muffler and check for carbon buildup. Is the spark plug the correct one for the saw? It's also possible the piston or cylinder are scored or carboned up. I would suspect the timing is too early. or Best Offer. in the cylinder overnight because the rings are cerboned up? The other reason might be the use of the wrong type of oil for the climate. Some of the contributing reasons include a full tank of oil, carbon buildup on the exhaust system, and malfunctioning spark plugs. I would suspect the timing is too early. Try blowing the crankcase out with air. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. 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. I hook up a drill to the nut on the clutch and start hard starting saws that way . It is like there is too much compression. Fine adjust everything and both saws start Normal now. As a result, normal compression settings will change based on the kind of chainsaw machine you are using. Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. 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. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. The key on the flywheel is in place and not sheered. Do that to the starter side when you're looking at the starter assy. Turn off the choke by pressing the control lever to activate the fast idle. However, if I push downward on the trigger button, it slows down to. The following have been addressed. Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when starting. Reassemble the chainsaw, refill the fuel tank, crank the engine and check for oil along the bar. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. water will not dissolve carbon; it is far too hard to be effected. The switch might be damaged or the motor is burned out. 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. 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. That is what was told to me by the area distributor technician That is the nature of a 250. A clear sign that you may have a chainsaw engine is when you smell gas while starting it. Low pressure, 20 to 30 pounds is all you need. 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. The plug should be tight against your thumb. It will be apparent if it is, but usually a scored saw won't run good, if at all. 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. Versions MS 260, Bar length 37cm, RSC 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. 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. This article will help you fix the most commonly reported problems of a Stihl chainsaw. Ask him if he's drop-starting it. I bought 2 032 Stihl saws at auction that pulled very hard. The saw runs and starts great. To ensure correct functioning and to prevent excessive compression, you might have to repair worn-out parts with new ones. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Hello. 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. Are you sure the starter rope isn't a little too short? "@type": "InteractionCounter", JavaScript is disabled. This is bad practice, and can damage your chainsaw. I tried draining the crankcase with the saw upside . It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. Replaced the chain and did some serious cutting and was so pleased. As the chain moves over the bar, it spreads the oil across the moving parts to reduce friction and heat. If it does maybe it is plugged. "datePublished": "2017-08-17", Don't put water into the 2 stroke. The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull. Below we have discussed the most common reasons why your chainsaw wont idle and the best way to fix it. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. You are using an out of date browser. 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. The power of the motor of an engine is measured in its capacity. 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. Get it ported and it brings it to another level. 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. My question is what is causing the trigger to not slow down. Guido Quoting Removed, click Modern View to see What?? "@id": "https://www.yesterdaystractors.com/" We're all about fixing small engines, from carburetor rebuilds, to crankshaft machining. In other words, the problem is in the trigger itself, not a. carb adjustment screw. 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. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", I think that's what happened, although I didn't think such a small amount could do it. 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. If the spark plug is too corroded or the electrode is faulty, it cannot create an electrical current to start the system. For a better experience, please enable JavaScript in your browser before proceeding. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. 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. Generally covering everything under 25 HP. A very loose chain will cause the blades to come out of the bar, while a very tight chain is also not ideal for the proper functioning of the chainsaw. Try taking it out, Then holding the trigger while you pull fast. Tighten the tension screw with a screwdriver to tighten the chain around the bar. Follow the steps below on how to fix a flooded chainsaw engine. When you are doing a cold start, push the choke lever to the warm start when the engine starts to run. So, If you feel too much compression while pulling a chainsaw, the possible reasons might be as below. Temperature Of The Engine A heavy-duty engine gets hot faster and works better than a cold engine. Unscrew the spark plug wrench using a spark plug from the engine. Most times, when the Stihl chainsaw stops working, it is never a complete breakdown. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . 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. Register today and take advantage of membership benefits. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . Admitted Woodaholic. 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. I've done it to high hour Kohler engines many times. 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. Thus far, you have learned how to diagnose most problems with the Stihl chainsaw and how to fix the issues. Carboned rings will decrease not increase compression. The starter assembly often fails to rotate due to a weak connection between the pulley and the ignition rope. If there is any damage to the pulley at any stage, it will cause High Compression or stiffness during a pull.. As a result of using bad fuel or leaving fuel in the chainsaw for a long time, the fuel evaporates and leaves behind a sticky substance that accumulates and clogged the carburetor. All it needs is a few inches missing and it will pull too hard like the compression is too high. Obviously, the motor, which has a huge capacity, will require more compression. High compression in chainsaws is a dangerous problem that can lead to serious injuries. If you still have questions regarding high chainsaw compression, you can discuss them in the comments. It takes a Bosch WSR6F or NGK BPMR7A. Let saw run until its warmed up, and go cut wood. Several reasons can cause your Stihl chainsaw to bog down when your pull the trigger. When this pressure, or compression, is too low or high, the chainsaw . 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. Generally the minimum is 110 lbs. I would never put water in it! Sometimes, this might be triggered by another problem that is impacting your system. It is usual for the chainsaw chains to come off with continued use, but there is usually an underlying cause when its too repetitive. However, you still have to confirm the size of the gap before installing. Getting these problems resolved is a rather straightforward process. If that is true, I'd suspect that the timing is off and why it's ripping the cord from your hand. Below are the reasons the chain keeps coming loose and how to fix it. ", If you find the brake drum moving, you must replace the needle bearing. The Pulley compartment plays a massive role in retracting the ignition rope. Make sure you have a replacement spark plug on hand in case the problem recurs in the future. I've done it to high hour Kohler engines many times. Doesnt pull at all or just hard to pull. If A two cycle engine gets flooded BADLY, oil can separate from the gas mix, accumulate in the crankcase and creates an hydrostatc lock. After that, using a ratchet, remove the spark plug from the engine. A lot of variables might contribute to excessive compression while using a chainsaw. Every chainsaw engine has a different capacity depending upon its motor power. Do that to the starter side when you're looking at the starter assy. Would not be afraid to do it to a 4, 6, or V-8. Once it's removed, you can place a gauge on the place of the spark plug. The other cause of your chainsaws high compression could be the stuck ignition rope. Remove the air filter, wash it with detergent and water and scrub off the dirt with a brush. 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. no, afraid I don't have equipment to test. In addition, you should check the muffler and piston while youre at this point. Pull the starter rope until you hear the first sign of it firing with a small burp. I usual only choke my MS250 for one pull and no longer have the flooding issue. I've done it to high hour Kohler engines many times. Compression is measured by using a simple screw-in gauge. You need to pull the exhaust to check that. 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