A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. "@type": "ImageObject", Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. It would give you rusted bearings. Use an adjustable wrench to loosen the two nuts on both sides of the chainsaw. Replace the fuel filters instead of cleaning them as they are pretty affordable and easy to install too. Make sure there is oil in the engine. Insufficient fuel in the system may result in excessive compression. Check for clogging around the bar oil. Sometimes, the ignition rope is frayed or stuck inside the starter housing. Don't put water into the 2 stroke. If you see any unusual movement of spring, then take it in to replace it. Pull the starter rope until you hear the first sign of it firing with a small burp. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. You should also make sure the new gas you use is appropriate for the chainsaw. 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. 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. (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 Blup throttle to bring it down to idle. If the chainsaw wont stay running when the engine is idle, adjust the carburetor. A heavy-duty engine gets hot faster and works better than a cold engine. 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 you start the chainsaw, it triggers the worm drive to engage the oiler to send oil through a port that releases onto the bar. You are using an out of date browser. This is because your oil is not rated to get to work at a low temperature. Most times, when the Stihl chainsaw stops working, it is never a complete breakdown. You can use a ratchet to do the task. The ignition system is responsible for igniting the fuel and air mixture to produce energy that powers the chainsaw. I just picked up a well used 025 that runs like a champ and has quite a bit of compression, I have not put a gauge on it but it will pull the starting handle out of my hands if I'm not paying attention. I have a MS250 that has come up on compression since new. The owner is complaining of hard to pull start. The spark plug is located in the engine and ignites the fuel and air mixture, driving the piston and running the engine. If the coil is faulty, there will be no spark to start the engine and run the chainsaw. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. It is, therefore, necessary to determine if the problem has been remedied by adding fresh fuel. The compression limit should also be doubled if the engine capacity is 100 CC. It is effortless to check the starter spring; pull the ignition rope. Don't know what to do at this point. "height": 57 You will notice the compression less. 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. Unscrew the spark plug using a ratchet and screw the compression gauge in its place. Fine adjust everything and both saws start Normal now. We're all about fixing small engines, from carburetor rebuilds, to crankshaft machining. $49.99. after that I'd be looking at crank bearings. 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. 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. 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. Yes I tried that last time and it did help some. A 250 has a fair amount of compression for a smaller saw but not that bad. A flooded engine is when there is too much gas in the combustion chamber, usually due to repeatedly starting the chainsaw using the recoil system without the engine starting. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. 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. Once the 250 is running, its fine. 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. Free shipping. This compression converts fuel (any source) into the potential energy in the engine to start it. $20.00 shipping. Check the chain tension and adjust it if it is too loose or tight. Over time or when using the wrong fuel, the fuel filter becomes too clogged and restricts fuel flow, killing the engine shortly after starting. I have had the cylinder off. 1. saw has new carb 2. flywheel has been removed and key inspected. The piston and rings are very shiney. No carbon on top or on roof of cylinder. How big a fella are ya? We and our partners use cookies to Store and/or access information on a device. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Press J to jump to the feed. You can follow the steps on how to troubleshoot and revive it when it wont start. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. 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. Turn the brake off. Clean any mildly dirty parts and replace all the damaged parts. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. There is no idle when I release the trigger. You can also quickly fix this anomaly by ensuring a proper troubleshooting of the pulley compartment to find damages. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. You never try to get it to run with the choke on. If you suspect a compression issue, seek professional help as compression repairs can be complicated. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. It had a compression release, and it started and ran well. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. 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. Sometimes it kicks and the rope pulls right out of my hand. Trying to rotate the chain while a huge piece of wood is . NelsGarage will share the knowledge Ive gathered about different tools and give you tips to accomplish your DIY projects faster. Finally the fuel will be converted into energy. Turn the engine to get under the piston and blow the crankcase out. We are compensated for referring traffic and business to Amazon and other companies linked to on this site. everything is harder in a tree, not a conclusive test. 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 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. The switch might be damaged or the motor is burned out. Maybe the piston is hitting it. no, afraid I don't have equipment to test. 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. Hold the tip of the blade and adjust the tension of the chain correctly. Stihl MS290 MS390 MS310 Chainsaw Has Oil Tank Engine Housing Assembly OEM/ Bin G . Try it, it may just do the trick! That is the nature of a 250. Compression is measured by using a simple screw-in gauge. The Pulley compartment plays a massive role in retracting the ignition rope. You will notice the compression less. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. I;ve read somewhere to put water? The plug should be tight against your thumb. Low pressure, 20 to 30 pounds is all you need. The key on the flywheel is in place and not sheered. Your chainsaws compressive strength is measured with the use of a screw-in gauge. That is what was told to me by the area distributor technician Check for side play in the crankshaft. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . Can anyone make a suggestion. what and or where is the metering lever.? Wash the dirty filter with a non-abrasive detergent and water. The end of the tester must protrude exact the same volume into the cylinder as the spark plug or the reading will be wrong. If a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. It is usual for the chainsaw chains to come off with continued use, but there is usually an underlying cause when its too repetitive. The chain oil will keep the chain lubricated, keep off dirt and allow smooth movement. You can check the compression by pulling the spark plug out and holding it in your hand. The compression limit should also be doubled if the engine capacity is 100 CC. I hope you understand the problems why your chainsaw is hard to pull. Check for dirty fuel tanks, clogged fuel filters, loose pipes, clogged air filters, and a dirty carburetor, which can all the fuel volume going into the combustion chamber. Ok folks, I'm stumped. 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. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. My /Sthil 034 is very difficult to start. Advanced arborist chainsaw with a top handle and STIHL M-Tronic technology. I would never put water in it! You have an option to either pull off the starter and clean it or look for an ideal replacement for your starter house. I would never put water in it! I changed to synthitic. If this is the case, you may want to try lubricating the rope to see if it would assist to resolve the difficulties. The spark arrestor in a chainsaw traps exhaust products emitted from an internal combustion engine.