A 250 has a fair amount of compression for a smaller saw but not that bad. Does the saw have a compression release? If A two cycle engine gets flooded BADLY, oil can separate from the gas mix, accumulate in the crankcase and creates an hydrostatc lock. 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. "headline":"Chainsaw has too much compression", Press J to jump to the feed. A hot engine also requires more compression to convert furl into energy as compared to the colder one. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. Obviously, the motor, which has a huge capacity, will require more compression. of compression. If the chainsaw is too much compression, it may be difficult to start. I've been working on a Stihl 026 chainsaw that John found, and it is very hard to crank. 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. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. It had a compression release, and it started and ran well. It runs good after I get it started. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. $75.00. If it is not physically damaged, clean it with clean gasoline and a rag. 4 Possible Problems & Solutions Problem 1: Damaged starter housing Solution: 1. Low pressure, 20 to 30 pounds is all you need. I have a MS250 that has come up on compression since new. Quoting Removed, click Modern View to see Don't put water in the saw-ever. Take better care of your chainsaw and perform regular maintenance according to the manufacturers recommendations to prevent any of these problems. No compression when pulling start rope. It may not display this or other websites correctly. Check for any cracks and damages and replace if necessary. A heavy-duty chainsaw requires a large amount of compression, whereas a chainsaw with a smaller engine needs less compression to convert fuel into energy. I hook up a drill to the nut on the clutch and start hard starting saws that way . 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. Use a brush and cloth to clean and remove any dirt, mud, or debris that can interfere with the controlsclean around the chain brake lever, the air filter housing, and the filter. 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. Confirm the spark plug gap, check and adjust with a feeler gauge or gaping tool. Doesnt pull at all or just hard to pull. Remove the entire carburetor and clean 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. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. Make sure there is oil in the engine. You need to pull the exhaust to check that. And some will have more. JavaScript is disabled. Ensure the chain fits snugly inside of the bar and the teeth that keep it in place are not worn down too low. I hook up a drill to the nut on the clutch and start hard starting saws that way . If the spark plug is too corroded or the electrode is faulty, it cannot create an electrical current to start the system. Sometimes an adapter is needed to make a tight fit. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. This can lead to serious injuries, including cuts and amputations. $99.95. Make sure the crank taper is clean and the flywheel taper also. Not sure it would accomplish anything on a 2-stroke chain saw engine. 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. Is the spark plug the correct one for the saw? If the chainsaw is too little compression, it may start easily but will not run smoothly. I was given (estate) a small McCulloch chain saw and it started and ran great. 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. 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. It would give you rusted bearings. Don't put water into the 2 stroke. 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 what was told to me by the area distributor technician. 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! I missed the "no carbon". Pull trigger and set full choke. 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. As long as I can get it going.. When the engine starts running, turn the choke off. 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 you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . Im Nelson, a DIY enthusiast with a bottomless can-do attitude. 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. 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. 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. Sounds like it was broken in "right", show the guy how to start it and tell him to be happy. To inspect the guide bar, disassemble the chain cover, chain and bar. Versions MS 260, Bar length 37cm, RSC When this pressure, or compression, is too low or high, the chainsaw . 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. Get you some Sea Foam at the local auto parts store. 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. If oil is in there it is what makes the engine feel like it is almost locked up. He checked.it clearly says that in the OP. John Deere and its logos are the registered trademarks of the John Deere Corporation. There is no carbon build up and all looks like new. 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. Required fields are marked *. The compression limit should also be doubled if the engine capacity is 100 CC. It is possible however to flood a two stroke which can cause the plug to fowl. Register today and take advantage of membership benefits. Could your gauge be off a little? Soaking in water will do nothing but rust things up . If the chainsaw still wont start, it is defective and requires a replacement. That is the nature of a 250. Wipe off the excess fuel from the spark plug with a clean rag. Thanks! In a similar vein, if the wrong kind of oil is used, the compression may be increased. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. This could be understood by reading the further explanation below. Replaced the chain and did some serious cutting and was so pleased. 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. Unscrew the spark plug wrench using a spark plug from the engine. chain saw compression release mod. I would suggest clearing the cylinder by pulling the rope with the plug out. Loosen the nuts and bolts clockwise and then pull out the oil pump gently. Trying to rotate the chain while a huge piece of wood is . Below we have discussed the most common reasons why your chainsaw wont idle and the best way to fix it. Ask him if he's drop-starting it. A cold engine will need the compression of 50-100 PSI whereas a hot engine will require compression above 150 PSI. I get it going now and its easier but its still a bear. I would suspect the timing is too early. 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. When the spark plug is removed, the engine turns Ask an Expert Car Questions Small Engine Troubleshooting JON, Small Engine Technician 2,680 Satisfied Customers Certified Small Engine Technician JON is online now Related Small Engine Questions Take off the muffler or the carb to get access. All it needs is a few inches missing and it will pull too hard like the compression is too high. You never try to get it to run with the choke on. 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! All it needs is a few inches missing and it will pull too hard like the compression is too high. Locate the spark plug from the top of the engine underneath the chain brake handle. I went with a meteor piston/cylinder set. What ratio mix is he using? Check the saws exterior for loose bolts, nuts, and screws and tighten them with an adjustable wrench or screwdriver. 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. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. 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. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. A drastic and frankly silly thing to do though . I thought all the fuel was out but there was some in the line yet. Not sure it would accomplish anything on a 2-stroke chain saw engine. Create an account to follow your favorite communities and start taking part in conversations. Therefore, it does not need any compression rate to start. "mainEntityOfPage": { Move the selector lever up one position immediately or the saw will flood on the very next pull. When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. 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. It was easier to pull after I cleaned it up, but still tough. Too much carbon will do that, check the piston top and combustion chamber. However, if I push downward on the trigger button, it slows down to. Why is the Garage Door Opener Light Not Working? However, this will vary by model and compression readings alone are not enough to determine the condition of the engine. Carboned rings will decrease not increase compression. When there is too much fuel, it will not ignite, and the engine wont start. 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. It's from not pulling hard enough. Pull the starter rope until you hear the first sign of it firing with a small burp. That is the nature of a 250. When there is no air for the spark to ignite, the chainsaw will start and then die after a short while. 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. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. 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. If that doesnt work, try gently tapping on the side of the bulb with a screwdriver or other tool. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Press question mark to learn the rest of the keyboard shortcuts. Always change the spark plug after 100 operating hours of the chainsaw to avoid engine problems. Then, use a wire brush to remove all the carbon build-up from the cylinder and piston. ProTip: You can use a small air compressor to blow air through the air filter and get rid of the loose dust before proceeding to clean it further. Hope this helps. So, replacing the ignition rope is a better option to keep everything working smoothly without any damage. How Much Compression Should a Chainsaw Have. 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. Turn the engine to get under the piston and blow the crankcase out. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Any ideas? "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", Replace the spark plug with a new identical. Wash the dirty filter with a non-abrasive detergent and water. Quoting Removed, click Modern View to see Don't put water in the saw-ever. The carburetor is a significant part of the chainsaw. The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull. If the compression is too high or too low, the engine wont start. after that I'd be looking at crank bearings. If it is flooded that should clear it up. 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. water will not dissolve carbon; it is far too hard to be effected. }, Once the 250 is running, its fine. I have a MS250 that has come up on compression since new. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. 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. The Stihl 066 chainsaw uses the same type of engine most gasoline-powered yard tools use, a two-cycle combustion engine. water will not dissolve carbon; it is far too hard to be effected. Compression is measured by using a simple screw-in gauge. 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. I'm an arborist by profession & a blogger by passion. Now, how much compression the engine of a chainsaw needs depends upon its motor capacity and temperature. I would never put water in it! 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. Wipe off lubricant and grime from the bar with a clean rag. Dont substitute it with. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. 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. You have an option to either pull off the starter and clean it or look for an ideal replacement for your starter house. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. Help, can't pull start Stihl MS250 chainsaw, too much compression. Carbon buildup is yet another important factor in the increasing compression experienced by chain saws over time. Likewise, low compression in the engine will be slow and retarding and it is a warning sign of leakage in your engine. Flooding usually happens due to an underlying issue: a bad spark plug, bad gas, or a faulty carburetor. It uncoils, tightens the spring, engages the clutch to start the engine. Yeah, I must have flooded it as I was working on it. I would never put water in it! Don't know what to do at this point. Check the spark plug and replace it if needed. It will be apparent if it is, but usually a scored saw won't run good, if at all. However, these moving parts, to stay moving, require a substantial amount of compression. Change in temperatures and dirt will cause clogging anywhere the oil passes, and this can prevent the oil from spread all across the bar. Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. If the starter spring is keep working correctly, it will retract the ignition rope. Try blowing the crankcase out with air. 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. You will notice the compression less. 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. How does it feel with the spark plug removed? Runs well, except it. A chainsaw is going to be exposed to oxidation over time, but you can at least limit the process by storing your chainsaw well. When the motor warms up after about a minute, turn on the choke position. Your email address will not be published. There is no idle when I release the trigger. Spark plugs that are not functioning properly are another probable cause of excessive compression. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. 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. Thank you for the responses. 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. In addition, you should check the muffler and piston while youre at this point. }, We and our partners use cookies to Store and/or access information on a device. Fine adjust everything and both saws start Normal now. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. The Pulley compartment plays a massive role in retracting the ignition rope. This increased distance will cause the chain to keep coming out of the guiding bar with the vibrating saw. I'm hearing thats just the nature of the beast. let it idle over lunch, just made sure to not go too long between filling it with gas, while running of course. With the choke engaged, pull the starting rope several times again, and the chain saw should start on the third pull. Turn the engine to get under the piston and blow the crankcase out. For 503552201 Cylinder Compression Plug Package Include: 3 x Cylinder Plug Cylinder Compression Plug The flywheel is loose? It's an older saw I bought at a garage sale. When the fuel starts to turn stale, it gums up and clogs the carburetor just as it would in an unused lawnmower. Similarly, a 4-stroke engine needs 2 times more compression than a 2-stroke engine, around 180-210 PSI. 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. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. It does not take much to increase the compression. "description":"Discussion of Chainsaw has too much compression in the Tool Talk forum followed by comments. If you buy another battery, make sure it has the same voltage and amperage as the old battery. Then Google decarb . Would have to remove spark plug and rinse cylinder with gas to be able to start. Check for side play in the crankshaft. John Deere and its logos are the registered trademarks of the John Deere Corporation. It runs good after I get it started. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. Chainsaw Parts. Replace the fuel filters instead of cleaning them as they are pretty affordable and easy to install too. Take off the muffler or the carb to get access. It is best to put a new plug in after clearing. Currently I live in Austin, United States. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. The other cause of your chainsaws high compression could be the stuck ignition rope. It very often kicks back and pulls the starter rope back in. I got it started. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. The second thing, Read More Stihl Chainsaw Charger Not WorkingContinue, Your email address will not be published. read more Vince O. I bought it used around 1978. You may also notice that the chain saw loses power during operation. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. In this case fixing or repairing is required or worst replacing the engine all at once. It is significantly tougher to pull over than an 024 or the new 241. or Best . If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. I have plenty of engines with REALLY low compression that I'll be glad to swap him. The ignition system is responsible for igniting the fuel and air mixture to produce energy that powers the chainsaw. That model is extremely easy to flood. Low pressure, 20 to 30 pounds is all you need. It would give you rusted bearings. Also check the air filters and make sure they are clean. Even with new spark plugs in, incorrectly removing and installing the spark plugs can prevent the engine from starting. In other words, the problem is in the trigger itself, not a. carb adjustment screw. It is usual for the chainsaw chains to come off with continued use, but there is usually an underlying cause when its too repetitive. A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips. Also take the spark plug out and do the same. I hope my epic guides will help you to choose,buy and maintain chainsaw. There might be a small stone or thing that is stuck inside the starter and causes the rope not to retract. It works when cold-starting the engine, when the engine is idle and when the engine is open.
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