Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. You are using an out of date browser. I think that's what I'd do. It runs good after I get it started. Hold the tip of the blade and adjust the tension of the chain correctly. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. Reddit and its partners use cookies and similar technologies to provide you with a better experience. It works when cold-starting the engine, when the engine is idle and when the engine is open. Even though it was purchased "brand new" I'm not so sure. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. The following have been addressed. Make sure the keyway is lined up correctly and tighten the nut down good and tight. after that I'd be looking at crank bearings. Save my name, email, and website in this browser for the next time I comment. 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. Pour starting fluid into the carburetor and crank the engine several times. So, replacing the ignition rope is a better option to keep everything working smoothly without any damage. Once the 250 is running, its fine. A cold engine will need the compression of 50-100 PSI whereas a hot engine will require compression above 150 PSI. Sometimes the spring stops working correctly due to overuse and becomes brittle. 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. My question is what is causing the trigger to not slow down. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. 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. The carburetor is a significant part of the chainsaw. Being in the cutting services for more than 10 years, I know a thing or two about chainsaw. } A drastic and frankly silly thing to do though . 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! Check for side play in the crankshaft. It's an older saw I bought at a garage sale. 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. }, Sometimes it kicks and the rope pulls right out of my hand. 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. 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! 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 read more Vince O. Your ignition rope must be intact properly with the pulley to work correctly. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. Don't know what to do at this point. John Deere and its logos are the registered trademarks of the John Deere Corporation. Make sure it's greased and the bushings are good. 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. It is best to put a new plug in after clearing. Sometimes, the ignition rope is frayed or stuck inside the starter housing. A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. Turn the brake off. Stihl 251 chainsaw. Other than that, you should also use the correct spark plugs for your chainsaw. 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 Check for clogging around the bar oil. { "interactionType": "https://schema.org/CommentAction", I went with a meteor piston/cylinder set. If it looks physically fine after cleaning it and you havent changed it in a few seasons, you should still replace it. Wipe off any flammable fluid from the metal surface of the engine with a clean rag. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. You will notice the compression less. }, If I drop start it I can pull it through 1 compression stroke. Winterizing a pool is an important step in maintaining the longevity and health of your pool. Drain and discard the old fuel, mix new fuel and cycle oil in the ratio 50:1 in a container, shake it and then pour the mixture into the chainsaws fuel tank. That is the nature of a 250. 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. Press J to jump to the feed. The Stihl 066 chainsaw uses the same type of engine most gasoline-powered yard tools use, a two-cycle combustion engine. 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. A chainsaw with no spark will shut down suddenly or not start at all. It uncoils, tightens the spring, engages the clutch to start the engine. Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. 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. 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. The extra effort to pull the saw is probably due to carbon build up on the piston crown and combustion chamber. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. Hope this helps. Manage Settings Trying to rotate the chain while a huge piece of wood is . 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. You can check the compression by pulling the spark plug out and holding it in your hand. (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 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. The consent submitted will only be used for data processing originating from this website. after that I'd be looking at crank bearings. That model is extremely easy to flood. The Stihl chainsaw uses a four-position lever ignition system called the master control lever. Quoting Removed, click Modern View to see What?? I would suggest clearing the cylinder by pulling the rope with the plug out. Not sure it would accomplish anything on a 2-stroke chain saw engine. When there is too much fuel, it will not ignite, and the engine wont start. The Pulley compartment plays a massive role in retracting the ignition rope. Would have to remove spark plug and rinse cylinder with gas to be able to start. 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. If it is flooded that should clear it up. "datePublished": "2017-08-17", 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. I love to write about chainsaw for homeowners and professionals. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. Too much hot or cold engine does not work or even start to produce vacuum pressure inside engine. $99.95. You are misunderstanding WHY water is put into carboned up engines. On a 2 stroke the water would go into the crank case first and pool up. For a better experience, please enable JavaScript in your browser before proceeding. Try blowing the crankcase out with air. Remove the right side cover, bar, and chain. Try taking it out, Then holding the trigger while you pull fast. 24" is what I've got on mine, but it can handle a bigger bar. Once youve done that, reassemble the chainsaw, which should work properly again. Move the selector lever up one position immediately or the saw will flood on the very next pull. Disconnect the spark plug from the engine and inspect if it is damaged, eroded, or dirty. I would never put water in it! Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. It would give you rusted bearings. Without proper compression, the engine will not be able to suck and use the fuel for combustion. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. "userInteractionCount": 23 Youll need to clean the cylinder and piston to fix this thoroughly. Compression gauges are not always accurate and different engines will provide different results. 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. How Many Amps Does a Garage Door Opener Use? If this is the case, you may want to try lubricating the rope to see if it would assist to resolve the difficulties. If you suspect a compression issue, seek professional help as compression repairs can be complicated. Detailed, well-researched, and accurate home and garden information presented in an understandable format is our primary goal. Generally covering everything under 25 HP. Suitable Replacement Stihl MS 250 C Compression Release Parts Gas with ethanol also burns hotter than gasoline which can cause the engine to overheat and burn the plug electrodes. Does the saw have a compression release? There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Unscrew the clutch assembly on top of the oil pump. 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. Don't know what to do at this point. Block the spark plugs hole by putting a nylon rope to prevent the piston from moving. Don't put water into the 2 stroke. A drastic and frankly silly thing to do though . It would give you rusted bearings. Repair or replace the damaged part 2. It was metering lever. Press question mark to learn the rest of the keyboard shortcuts. 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. Carboned rings will decrease not increase 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. Stihl 291 chainsaw too much compression Check the compression of the engine. If there is any damage to the pulley at any stage, it will cause High Compression or stiffness during a pull.. John Deere and its logos are the registered trademarks of the John Deere Corporation. Pull trigger and set full choke. Check the spark plug of the chain saw if the engine is not starting at all. If so, show him how to start it on the ground with his foot in it or with the rear handle between his thighs. Any ideas? The end of the tester must protrude exact the same volume into the cylinder as the spark plug or the reading will be wrong. or Best . The first step is to remove the cover that covers the spark plug on your 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. 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. Subsequent starts are just as hard. 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. You never try to get it to run with the choke on. 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. The excess gas can be cleared simply by removing the plug and operating the starter a few times. Make sure the gap is according to the specifications of your chainsaws engine. My one and only MS250 was a kicker to start it but that was the only problem. That is what was told to me by the area distributor technician That is the nature of a 250. water will not dissolve carbon; it is far too hard to be effected. 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. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . 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.. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. That is the nature of a 250. 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. A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. If you still have questions regarding high chainsaw compression, you can discuss them in the comments. 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. I thought all the fuel was out but there was some in the line yet. It does not take much to increase the compression. This is because each machine is made differently and has various needs. A compression gauge is used to measure the compression of a chainsaw which works similarly to the tire gauge. To test the recoil starter, remove it and reposition the spring. in the. The compression limit should also be doubled if the engine capacity is 100 CC. All it needs is a few inches missing and it will pull too hard like the compression is too high. 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. Below we have discussed the most common reasons why your chainsaw wont idle and the best way to fix it. The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. ", Now, how much compression the engine of a chainsaw needs depends upon its motor capacity and temperature. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. "height": 57 Then Google "decarb". If the rails are shallow, you need to replace them. You will notice the compression less. Soaking in water will do nothing but rust things up . Here is how to troubleshoot a malfunctioning spark plug. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. "width": 200, I have a MS250 that has come up on compression since new. If the reading is below or above the required range, then your ignition coil requires changing. Getting these problems resolved is a rather straightforward process. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. 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?? Has someone invented a new kind of two stroke motor? The key on the flywheel is in place and not sheered. On a 2 stroke the water would go into the crank case first and pool up. Try blowing the crankcase out with air. runs way too fast. Make sure the crank taper is clean and the flywheel taper also. The purpose of a choke in a chainsaw is to make cold starting more effortless, but if you do not use it properly. I have a MS250 that has come up on compression since new. I would never put water in it! Every chainsaw needs to have some compression to ensure that it operates well. What ratio mix is he using? Being new carb, wasn't looking that direction educate a non mechanic. If you suspect a compression issue, seek professional help as compression repairs can be complicated. A drastic and frankly silly thing to do though . 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. Finally the fuel will be converted into energy. Doesnt pull at all or just hard to pull. I used to have a Homelite that would do that if I left gas in it. I've got one here with 105-110 compression that I can't get to run and it feels kinda funny when I pull the starter rope, like it has compression with the piston going up and down. Likewise, low compression in the engine will be slow and retarding and it is a warning sign of leakage in your engine. Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. I got it going. Although this is often true, it is not always the case. You may also want to go ahead and replace the plug. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. This may sometimes jam your chainsaws rings, causing it to become inoperable. 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.. Therefore, it does not need any compression rate to start. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Would not be afraid to do it to a 4, 6, or V-8. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. "interactionStatistic": { The flywheel is loose? You can follow the steps on how to troubleshoot and revive it when it wont start. You need to pull the exhaust to check that. All it needs is a few inches missing and it will pull too hard like the compression is too high. If it is not physically damaged, clean it with clean gasoline and a rag. 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. After that, using a ratchet, remove the spark plug from the engine. 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. I used to have a Homelite that would do that if I left gas in it. 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. #3. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. The choke position is the fourth setting on the master control lever. everything is harder in a tree, not a conclusive test. "publisher": { 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. We got rid of both of those useless things . }. It's also possible the piston or cylinder are scored or carboned up. This is because your oil is not rated to get to work at a low temperature. I think that's what happened, although I didn't think such a small amount could do it. Fine adjust everything and both saws start Normal now. i have a ms 250. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. $75.00. or Best Offer. 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 Wipe off the excess fuel from the spark plug with a clean rag. Check the spark plug and replace it if needed.
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