Here is how to troubleshoot a malfunctioning spark plug. 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. Low pressure, 20 to 30 pounds is all you need. "interactionStatistic": { Save my name, email, and website in this browser for the next time I comment. #3. If you still have questions regarding high chainsaw compression, you can discuss them in the comments. I tried draining the crankcase with the saw upside . of compression. If you see any unusual movement of spring, then take it in to replace it. This Indoor Fly Traps: 5 Things You Didn't Know About Indoor Fly Traps. Is the spark plug the correct one for the saw? 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?? Other than that, you should also use the correct spark plugs for your chainsaw. Keep in mind that good maintenance and storage will reduce breakdowns and maintain your tools performance throughout its lifetime. 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. 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. That is the nature of a 250. Let saw run until its warmed up, and go cut wood. A large engine has a huge capacity in its motor. Create an account to follow your favorite communities and start taking part in conversations. "@type": "WebPage", Always change the spark plug after 100 operating hours of the chainsaw to avoid engine problems. Block the spark plugs hole by putting a nylon rope to prevent the piston from moving. It had a compression release, and it started and ran well. NelsGarage will share the knowledge Ive gathered about different tools and give you tips to accomplish your DIY projects faster. Make sure the keyway is lined up correctly and tighten the nut down good and tight. Mar 22, 2017. Would not be afraid to do it to a 4, 6, or V-8. John Deere and its logos are the registered trademarks of the John Deere Corporation. You will notice the compression less. The manual for this model, and the parts breakdown, show a compression release valve. All it needs is a few inches missing and it will pull too hard like the compression is too high. Try blowing the crankcase out with air. Check for clogged shafts and jets, clogged carburetor, damaged valves, stuck levers, and damaged or warped diaphragms, all of which can interfere with the fueling process. Check the spark plug of the chain saw if the engine is not starting at all. Thus far, you have learned how to diagnose most problems with the Stihl chainsaw and how to fix the issues. Are you sure the starter rope isn't a little too short? Also check the air filters and make sure they are clean. A heavy-duty engine gets hot faster and works better than a cold engine. Welcome! 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. Move the selector lever up one position immediately or the saw will flood on the very next pull. Fuel filters trap dirt and contaminants from the fuel to prevent them from damaging the engine. If it is hard to pull, then check how the spring is performing. It is like there is too much compression. Dont substitute it with. Replace the fuel filters instead of cleaning them as they are pretty affordable and easy to install too. "name": "Yesterday's Tractor Co.", In addition, you should check the muffler and piston while youre at this point. in the, All Rights Reserved. Are you sure the starter rope isn't a little too short? A 50CC engine needs 150 PSI compression. Without proper compression, the engine will not be able to suck and use the fuel for combustion. Pull the starter rope until you hear the first sign of it firing with a small burp. Tighten the tension screw with a screwdriver to tighten the chain around the bar. 4 Possible Problems & Solutions Problem 1: Damaged starter housing Solution: 1. I would never put water in it! I would suspect the timing is too early. Follow the steps below on how to fix a flooded chainsaw engine. All it needs is a few inches missing and it will pull too hard like the compression is too high. A drastic and frankly silly thing to do though . If this is the case, you may want to try lubricating the rope to see if it would assist to resolve the difficulties. The choke should be closed during a cold start to limit the air and increase the fuel in the engine to keep it running while it warms up. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. You can prevent the new starter rope from fraying by burning the two ends of the rope. 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. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. 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. Don't know what to do at this point. 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. Press question mark to learn the rest of the keyboard shortcuts. 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 following have been addressed. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . What worked with my MS440 kicking problem should also work with that one. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . "publisher": { Don't put water into the 2 stroke. Would have to remove spark plug and rinse cylinder with gas to be able to start. Every chainsaw needs to have some compression to ensure that it operates well. 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. However, if I push downward on the trigger button, it slows down to. You need to pull the exhaust to check that. If the air filter is too clogged, you should replace it. Also take the spark plug out and do the same. Runs well, except it. I hope my epic guides will help you to choose,buy and maintain chainsaw. If it has damaged parts, replace it with a carburetor kit that fits your chainsaw model. Cleaned air filters and both were very dirty. 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. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) If it does maybe it is plugged. How Much Does it Cost to Install a Garage Door Opener? after that I'd be looking at crank bearings. I would suggest clearing the cylinder by pulling the rope with the plug out. When the air that reaches the chain saw's engine is insufficient, it becomes prone to overheating. Are you sure the starter rope isn't a little too short? Guido Quoting Removed, click Modern View to see What?? Lift the bars nose and tighten the nuts on the sidebar to secure the sidebar and guide bar in place. It is harmful to your machine to use old fuel. "width": 200, A drastic and frankly silly thing to do though . There might be a small stone or thing that is stuck inside the starter and causes the rope not to retract. Does the saw have a compression release? Check for any cracks and damages and replace if necessary. If it is flooded that should clear it up. It very often kicks back and pulls the starter rope back in. 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. Sometimes, this might be triggered by another problem that is impacting your system. Blup throttle to bring it down to idle. Remove the entire carburetor and clean it. As long as I can get it going.. Of all the Stihl saws, the MS250 is the toughest to start in relation to it's size. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. 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. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. $99.95. Pull trigger and set full choke. When there is no air for the spark to ignite, the chainsaw will start and then die after a short while. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. If A two cycle engine gets flooded BADLY, oil can separate from the gas mix, accumulate in the crankcase and creates an hydrostatc lock. Make sure the gap is according to the specifications of your chainsaws engine. Also check the air filters and make sure they are clean. I'm hearing thats just the nature of the beast. 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 Replace with a new starter house Problem 2: Damaged pulley system Solution: 1. The saw runs and starts great. chain saw compression release mod. The starter assembly often fails to rotate due to a weak connection between the pulley and the ignition rope. The carburetors work in a chainsaw engine allows the right amount of fuel and air mixture into the combustion chamber. Therefore, most people will wonder why the chainsaw has too much compression. If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. It prevents the carburetor from allowing too much fuel into the combustion chamber. Would not be afraid to do it to a 4, 6, or V-8. Starter fluids spray can help in those conditions Before pulling shoulder. You may also want to go ahead and replace the plug. It can be from something as simple as starting the chainsaw wrongly to more severe issues like a damaged carburetor. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. $49.99. Turn the engine to get under the piston and blow the crankcase out. It's from not pulling hard enough. It runs good after I get it started. Not sure it would accomplish anything on a 2-stroke chain saw engine. A hot engine also requires more compression to convert furl into energy as compared to the colder one. A clogged carburetor wont allow fuel into the engine, preventing it from starting. Please use the navigational links to explore our website. If the spark plug is too corroded or the electrode is faulty, it cannot create an electrical current to start the system. As far as compression, you can usually tell by how the saw pulls when starting it. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Even though it was purchased "brand new" I'm not so sure. If the compression is too high or too low, the engine wont start. 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. The exhaust is black but no build up. or Best . It is best to put a new plug in after clearing. 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. $20.00 shipping. With the choke engaged, pull the starting rope several times again, and the chain saw should start on the third pull. Looks like a saw without base gasket, and too little squish my 250 did the same thing,had to start it with no choke.Take the plug out,crank it the motor and see how much gas spews from the cylinder.Mine would blow out way to much.I had to adjust the metering lever in the carb,no problems after that. You have an option to either pull off the starter and clean it or look for an ideal replacement for your starter house. What are the numbers on your sparkplug? 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. The saw is about 2 years old, light use. Currently I live in Austin, United States. There is no carbon build up and all looks like new. 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