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I would suspect the timing is too early. 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. If the chainsaw still wont start, it is defective and requires a replacement. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. For a better experience, please enable JavaScript in your browser before proceeding. The saw runs and starts great. }, Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. When the engine starts running, turn the choke off. It runs good after I get it started. 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. However, if I push downward on the trigger button, it slows down to. It was easier to pull after I cleaned it up, but still tough. This article will help you fix the most commonly reported problems of a Stihl chainsaw. Hope this helps. The excess gas can be cleared simply by removing the plug and operating the starter a few times. In other words, the problem is in the trigger itself, not a. carb adjustment screw. 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. pulls with little resistance, similar to my farm boss. It is possible however to flood a two stroke which can cause the plug to fowl. Locate the tension adjustment screws to the side of the chainsaw guide bar. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. Back to top derwen1959 Long Time User Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. You can use a ratchet to do the task. Welcome! That model is extremely easy to flood. Temperature Of The Engine A heavy-duty engine gets hot faster and works better than a cold engine. 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. We got rid of both of those useless things . Are you sure the starter rope isn't a little too short? Stihl MS192T Chainsaw Fuel Oil Tank Engine Housing Assembly OEM. "logo": { "@type": "Organization", If you refuel your chainsaw and it still won,t start, below are some of the possible causes and solutions that will get the chainsaw functioning again. Check the chainsaws fuel if you have not used the tool for a while. Wipe off the excess fuel from the spark plug with a clean rag. I would suggest clearing the cylinder by pulling the rope with the plug out. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. ", 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. Unscrew the spark plug wrench using a spark plug from the engine. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) I've seen it happen a couple times. Mar 24, 2019. Help, can't pull start Stihl MS250 chainsaw, too much compression. What is the minimum compression for my STIHL chainsaw? As the chain moves over the bar, it spreads the oil across the moving parts to reduce friction and heat. If the reading is below or above the required range, then your ignition coil requires changing. Pull the rope until it starts. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. Unscrew the clutch assembly on top of the oil pump. There is no idle when I release the trigger. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. Would not be afraid to do it to a 4, 6, or V-8. So be sure to keep your chainsaw properly maintained and avoid compression problems. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. A 50CC engine needs 150 PSI compression. 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. after that I'd be looking at crank bearings. That is the nature of a 250. Hello EGBinOR, If A two cycle engine gets flooded BADLY, oil can separate from the gas mix, accumulate in the crankcase and creates an hydrostatc lock. Take off the muffler or the carb to get access. You need to pull the exhaust to check that. If A two cycle engine gets flooded BADLY, oil can separate from the gas mix, accumulate in the crankcase and creates an hydrostatc lock. A compression gauge is used to measure the compression of a chainsaw which works similarly to the tire gauge. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. A drastic and frankly silly thing to do though . $20.00 shipping. I hook up a drill to the nut on the clutch and start hard starting saws that way . If the coil is faulty, there will be no spark to start the engine and run the chainsaw. I changed to synthitic. Then Google decarb . It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. Sometimes an adapter is needed to make a tight fit. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. I have a MS250 that has come up on compression since new. Pour starting fluid into the carburetor and crank the engine several times. The purpose of a choke in a chainsaw is to make cold starting more effortless, but if you do not use it properly. I tried draining the crankcase with the saw upside . In addition, you should check the muffler and piston while youre at this point. Normally it's not a problem but if it was already difficult to pull it could be. You may also want to go ahead and replace the plug. Save my name, email, and website in this browser for the next time I comment. Friction is usually the cause of a rope failing to draw when it should. If it has damaged parts, replace it with a carburetor kit that fits your chainsaw model. I went with a meteor piston/cylinder set. I would never put water in it! Pull the rope until it starts. The end of the tester must protrude exact the same volume into the cylinder as the spark plug or the reading will be wrong. You will notice the compression less. Winterizing a pool is an important step in maintaining the longevity and health of your pool. Turn off the choke by pressing the control lever to activate the fast idle. All it needs is a few inches missing and it will pull too hard like the compression is too high. JavaScript is disabled. At this point, the battery will reset,, Read More How To Reset Echo 58-Volt Battery ChargerContinue, The chainsaw battery charger is constantly blinking red, even after charging for a long time!!! Replace with a new starter house Problem 2: Damaged pulley system Solution: 1. So, If you feel too much compression while pulling a chainsaw, the possible reasons might be as below. Fuel filters trap dirt and contaminants from the fuel to prevent them from damaging the engine. That is the nature of a 250. Get you some Sea Foam at the local auto parts store. 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. Modern View Forum powered by phpBB 2001, 2005 phpBB Group. 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.. The chain oil will keep the chain lubricated, keep off dirt and allow smooth movement. 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. I've done it to high hour Kohler engines many times. If it does maybe it is plugged. A large engine has a huge capacity in its motor. Would not be afraid to do it to a 4, 6, or V-8. Use of this Web site constitutes acceptance of our. Then, use a wire brush to remove all the carbon build-up from the cylinder and piston. idle. I can probably find one with at most 65 PSI. 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 Make sure it is snug but can also move freely by hand. Posted December 27, 2017. Admitted Woodaholic. In most cases, a buildup of carbon under the rings presses the rings against the cylinder, culminating in compression of the cylinder. Check the spark plug of the chain saw if the engine is not starting at all. It's also possible the piston or cylinder are scored or carboned up. JavaScript is disabled. As a result, normal compression settings will change based on the kind of chainsaw machine you are using. Disconnect the spark plug from the engine and inspect if it is damaged, eroded, or dirty. It does not take much to increase the compression. Do that to the starter side when you're looking at the starter assy. The plug should be tight against your thumb. Ron Cook. You can check the compression by pulling the spark plug out and holding it in your hand. 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. SPONSORED. If this does not fix the issue, it may be necessary to replace the whole starting rope system with another one. I think that's what I'd do. 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. Starter fluids spray can help in those conditions Before pulling shoulder. Tighten the tension screw with a screwdriver to tighten the chain around the bar. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Check the spark plug and replace it if needed. "image": { Several reasons can cause your Stihl chainsaw to bog down when your pull the trigger. in the, All Rights Reserved. It is thus highly recommended that you drain the fuel from your chainsaw if it still has any old gasoline left in it. Your email address will not be published. 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. Check the electrode gap of the spark plug and ensure it is 0.02 inches. When the air that reaches the chain saw's engine is insufficient, it becomes prone to overheating. The piston and rings are very shiney. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. I have a MS250 that has come up on compression since new. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. Remove the spark plug with a spark plug wrench and clean it with a brush to remove carbon scoring and dirt. Don't know what to do at this point. 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. "width": 200, Similarly, a 4-stroke engine needs 2 times more compression than a 2-stroke engine, around 180-210 PSI. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. ", In a similar vein, if the wrong kind of oil is used, the compression may be increased. or Best Offer. Stihl 024 - Sherlock Holmes issue - help needed here. { For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. A two-stroke gas-powered chainsaw uses relatively few moving parts. Likewise, low compression in the engine will be slow and retarding and it is a warning sign of leakage in your engine. Stihl chainsaw low compression diagnoses and How To Dave's Small Engines 8.89K subscribers Subscribe 17K views 2 years ago This video shows a Stihl MS310 chainsaw I have apart from low. The manual for this model, and the parts breakdown, show a compression release valve. Subsequent starts are just as hard. Why is the Garage Door Opener Light Not Working? Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. If the starter spring is keep working correctly, it will retract the ignition rope. John Deere and its logos are the registered trademarks of the John Deere Corporation. When your Stihl chainsaw doesnt start after changing the spark plug and fuel, some common problems to look for can help diagnose the source of the issue. Thanks. Get it ported and it brings it to another level. It's supposed to warm up later this week so I'll be able to do some more on this chain saw. "@type":"DiscussionForumPosting", If you suspect a compression issue, seek professional help as compression repairs can be complicated. 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. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Therefore, it does not need any compression rate to start. I;ve read somewhere to put water? When this pressure, or compression, is too low or high, the chainsaw . Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. First, remove the spark plug from the chainsaw. I hope you understand the problems why your chainsaw is hard to pull. 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. Carboned rings will decrease not increase compression. 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! Block the spark plugs hole by putting a nylon rope to prevent the piston from moving. By checking & repairing/replacing these, you can fix the issue. 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. 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. 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. Try blowing the crankcase out with air. Remove the entire carburetor and clean it. A smaller gap will cause a weak spark and poor ignition of the engine, while a wider gap will not bring out any spark. If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. As far as compression, you can usually tell by how the saw pulls when starting it. 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. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. If it is hard to pull, then check how the spring is performing. Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. They're easy to use and inexpensive, so if you are considering buying one for your home, there are a few quick things you Consumers in the Home and Garden sector turn to us for answers to their nagging questions about various goods and services. "userInteractionCount": 23 Disengage the chain brake, turn on the ignition switch and install the new spark plug into the rubber connector. 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. of compression. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. Follow the steps below on how to fix a flooded chainsaw engine. 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. If it has to do with small engines, it's welcome here. The owner is complaining of hard to pull start. Final step: removing the old spark plug and installing the new one. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. Of all the Stihl saws, the MS250 is the toughest to start in relation to it's size. Doesnt pull at all or just hard to pull. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . That is the nature of a 250. Check for any cracks and damages and replace if necessary. A 250 has a fair amount of compression for a smaller saw but not that bad. Generally the minimum is 110 lbs. "@context":"https://schema.org", Also take the spark plug out and do the same. Cleaned air filters and both were very dirty.