Too much hot or cold engine does not work or even start to produce vacuum pressure inside engine. I would never put water in it! I would never put water in it! 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 Yeah, I must have flooded it as I was working on it. The ignition system is responsible for igniting the fuel and air mixture to produce energy that powers the chainsaw. check the cylinder & piston for carbon build-up, how much compression Does the chainsaw Engine need, How To Reset Echo 58-Volt Battery Charger. Hold the saw firmly to the ground and crank the engine about four to six times to bleed out the fuel from the combustion chamber. It would give you rusted bearings. I bought 2 032 Stihl saws at auction that pulled very hard. 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. 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. Can anyone make a suggestion. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. I;ve read somewhere to put water? Final step: removing the old spark plug and installing the new one. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", A faulty spark plug will have carbon, dirt, and oil blocking the insulator nose, preventing it from firing consistently. An excessive amount of compression in your chainsaws starting rope could also be indicated by the beginning rope failing to draw. It does not take much to increase the compression. There might be a small stone or thing that is stuck inside the starter and causes the rope not to retract. Don't put water into the 2 stroke. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. However, you still have to confirm the size of the gap before installing. Even though it was purchased "brand new" I'm not so sure. 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. With the choke engaged, pull the starting rope several times again, and the chain saw should start on the third pull. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. }, So, replacing the ignition rope is a better option to keep everything working smoothly without any damage. Reddit and its partners use cookies and similar technologies to provide you with a better experience. An example of data being processed may be a unique identifier stored in a cookie. 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. Check if the wires are damaged or broken and replace them if necessary. Blup throttle to bring it down to idle. You need to pull the exhaust to check that. To clean it, drain the fuel, spray some carburetor cleaner and loosen the residue with a small brush. Check the tension 2. In addition, you should check the muffler and piston while youre at this point. Disengage the chain brake, turn on the ignition switch and install the new spark plug into the rubber connector. Welcome! I bought 2 032 Stihl saws at auction that pulled very hard. John Deere and its logos are the registered trademarks of the John Deere Corporation. Unscrew the clutch assembly on top of the oil pump. "width": 200, Advanced arborist chainsaw with a top handle and STIHL M-Tronic technology. The owner is complaining of hard to pull start. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. Use of this Web site constitutes acceptance of our. I have a MS250 that has come up on compression since new. It had a compression release, and it started and ran well. Quoting Removed, click Modern View to see What?? Winterizing a pool is an important step in maintaining the longevity and health of your pool. Take off the muffler or the carb to get access. The starter assembly often fails to rotate due to a weak connection between the pulley and the ignition rope. You have an option to either pull off the starter and clean it or look for an ideal replacement for your starter house. 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. Cleaned it all up, and had it tuned up. This is because your oil is not rated to get to work at a low temperature. Poke the oil feed hole with a 16-gauge wire to unclog it until it slides through the hole smoothly. 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.. I missed the "no carbon". Wipe off the excess fuel from the spark plug with a clean rag. Obviously, the motor, which has a huge capacity, will require more compression. Also take the spark plug out and do the same. Free shipping. It takes a Bosch WSR6F or NGK BPMR7A. Flooding usually happens due to an underlying issue: a bad spark plug, bad gas, or a faulty carburetor. The plug should be tight against your thumb. I hook up a drill to the nut on the clutch and start hard starting saws that way . If the reading is below or above the required range, then your ignition coil requires changing. On a 2 stroke the water would go into the crank case first and pool up. Wipe off any flammable fluid from the metal surface of the engine with a clean rag. I was given (estate) a small McCulloch chain saw and it started and ran great. The chain oil will keep the chain lubricated, keep off dirt and allow smooth movement. A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. It's also possible the piston or cylinder are scored or carboned up. When the oil pimp or oiler is faulty, it will reduce the chainsaws performance and power. Use recommedend chain oil lubricant. Create an account to follow your favorite communities and start taking part in conversations. 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?? 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. If it is the right sparkplug and not flooded, I would maybe buy a different saw with easy start. A compression gauge is used to measure the compression of a chainsaw which works similarly to the tire gauge. Would have to remove spark plug and rinse cylinder with gas to be able to start. Once youve done that, reassemble the chainsaw, which should work properly again. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. The end of the tester must protrude exact the same volume into the cylinder as the spark plug or the reading will be wrong. 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. }, Therefore, most people will wonder why the chainsaw has too much compression. I would suspect the timing is too early. Thank you for the responses. Generally covering everything under 25 HP. You should also make sure the new gas you use is appropriate for the chainsaw. Locate the tension adjustment screws to the side of the chainsaw guide bar. The saw is about 2 years old, light use. Once you identify the cause of high compression, you can repair that affected part or find a new replacement for it to make it work smoothly. "@type": "Organization", If the compression is not produced in the engine at an appropriate level, it will not be able to convert fuel into energy. That would have to be some puddle of oil for a MS250 to have a "bar oil leaking in and causing high compression problems" What kind of Stihl oil regular or synthitc, had an 025 years ago that was a real knuckel buster never checked compression but was using regular Stihl oil. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. If you do not replace the starter spring on time, it will cause you to replace the whole starter assembly. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Chainsaw Parts. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. Remove the entire carburetor and clean it. How to Reprogram a Chamberlain Garage Door Opener, How to Program a Universal Garage Door Opener, Toro Lawnmower Troubleshooting & How To Guide, Bostitch Nail Gun Troubleshooting & How to Guide. I got it going. Even with new spark plugs in, incorrectly removing and installing the spark plugs can prevent the engine from starting. Quoting Removed, click Modern View to see Don't put water in the saw-ever. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. Carboned rings will decrease not increase compression. It is, therefore, necessary to determine if the problem has been remedied by adding fresh fuel. 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. ", "@type": "WebPage", In this case fixing or repairing is required or worst replacing the engine all at once. Sparkplug was correct but I think it was a little flooded. If the chainsaw still wont start, it is defective and requires a replacement. "image": { Try blowing the crankcase out with air. "description":"Discussion of Chainsaw has too much compression in the Tool Talk forum followed by comments. All it needs is a few inches missing and it will pull too hard like the compression is too high. Some of the contributing reasons include a full tank of oil, carbon buildup on the exhaust system, and malfunctioning spark plugs. If oil is in there it is what makes the engine feel like it is almost locked up. Would not be afraid to do it to a 4, 6, or V-8. 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. Change in temperatures and dirt will cause clogging anywhere the oil passes, and this can prevent the oil from spread all across the bar. 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. If it does maybe it is plugged. I can probably find one with at most 65 PSI. I'm hearing thats just the nature of the beast. If the coil is faulty, there will be no spark to start the engine and run the chainsaw. How To Fix Chainsaw Battery Charger Blinking Red? When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. You will notice the compression less. It will be apparent if it is, but usually a scored saw won't run good, if at all. John Deere and its logos are the registered trademarks of the John Deere Corporation. That is the nature of a 250. I used to have a Homelite that would do that if I left gas in it. I think you'll like it. You need to pull the exhaust to check that. 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. 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. Its just that its nearly impossible to pull. It would give you rusted bearings. Register today and take advantage of membership benefits. Use an adjustable wrench to loosen the two nuts on both sides of the chainsaw. Suitable Replacement Stihl MS 250 C Compression Release Parts You never try to get it to run with the choke on. To avoid flooding the chainsaw when cold starting, turn the control lever to half choke after the fourth pull and then turn the lever again to the open choke position immediately when the engine starts. Not sure it would accomplish anything on a 2-stroke chain saw engine. The other cause of your chainsaws high compression could be the stuck ignition rope. Starter fluids spray can help in those conditions Before pulling shoulder. This increased distance will cause the chain to keep coming out of the guiding bar with the vibrating saw. The Stihl 066 chainsaw uses the same type of engine most gasoline-powered yard tools use, a two-cycle combustion engine. It can be from something as simple as starting the chainsaw wrongly to more severe issues like a damaged carburetor. 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. That is the nature of a 250. The piston and rings are very shiney. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. 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. The engine must be up to operating temperature, spray a light stream of water into the engine carb air inlet and the cold water shocks the hot carbon and the carbon flakes off and blows out the exhaust pipe. We will explain the causes of high compression and how you can quickly fix it to make it run smoothly. A 50CC engine needs 150 PSI compression. If it does maybe it is plugged. "name": "Yesterday's Tractor Co.", Fuel filters trap dirt and contaminants from the fuel to prevent them from damaging the engine. Can also be used with hedge trimmer attachment HS 246. Has someone invented a new kind of two stroke motor? Replaced the chain and did some serious cutting and was so pleased. To ensure correct functioning and to prevent excessive compression, you might have to repair worn-out parts with new ones. I think that's what happened, although I didn't think such a small amount could do it. My first chain saw was an old Homelite EZ with a blue metal case and a 20" bar. 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. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. "@type": "Person", Cleaned air filters and both were very dirty. A chainsaw with no spark will shut down suddenly or not start at all. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. Friction is usually the cause of a rope failing to draw when it should. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. 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. Ensure the chain fits snugly inside of the bar and the teeth that keep it in place are not worn down too low. Replace with a new starter house Problem 2: Damaged pulley system Solution: 1. Repair or replace the damaged part 2. (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 The choke position is the fourth setting on the master control lever. To fix this problem, turn off the chain saw and let it sit for about 30 minutes to allow the excess gas to evaporate. 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. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. Being new carb, wasn't looking that direction educate a non mechanic. 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. I got it started. That is what was told to me by the area distributor technician Check for side play in the crankshaft. However, these moving parts, to stay moving, require a substantial amount of compression. SPONSORED. The recoil starter in a chainsaw is a start mechanism that allows you to pull the rope. 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! You are using an out of date browser. 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. If a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? Clean any mildly dirty parts and replace all the damaged parts. Find the low speed, high speed, and idle speed screws near the carburetor, start the engine and allow it to warm up. For 503552201 Cylinder Compression Plug Package Include: 3 x Cylinder Plug Cylinder Compression Plug If you see any unusual movement of spring, then take it in to replace it. Would have to remove spark plug and rinse cylinder with gas to be able to start. If there is any damage to the pulley at any stage, it will cause High Compression or stiffness during a pull.. We got rid of both of those useless things . Although this is often true, it is not always the case. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. Keep in mind that good maintenance and storage will reduce breakdowns and maintain your tools performance throughout its lifetime. Check for broken teeth on the chain and replace them if necessary. 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. You are misunderstanding WHY water is put into carboned up engines. A drastic and frankly silly thing to do though . lol. Being in the cutting services for more than 10 years, I know a thing or two about chainsaw. How big a fella are ya? Try it, it may just do the trick! water will not dissolve carbon; it is far too hard to be effected. High compression in chainsaws is a dangerous problem that can lead to serious injuries. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Remove ignition coil and muffler. Back to top derwen1959 Long Time User However, the compression also has a limitation because a very high or very low compression will cause problems and prevent your chainsaw from operating efficiently. Finally the fuel will be converted into energy. If you recently refueled your Stihl chainsaw, stale gas can be a reason why it wont start. Press question mark to learn the rest of the keyboard shortcuts. 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. Would not be afraid to do it to a 4, 6, or V-8.
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