Your chainsaws compressive strength is measured with the use of a screw-in gauge. This is because each machine is made differently and has various needs. I wouldn't go messing with the carb expecting to cure the issue unless you have obvious signs of flooding when trying to start. Remove the air filter, wash it with detergent and water and scrub off the dirt with a brush. Press J to jump to the feed. Just wondering what your opinions are of the lowest compression you can run a Stihl MS250 at. When the engine starts running, turn the choke off. In addition, you should check the muffler and piston while youre at this point. Open the spark plug hole facing away from you, remove the wire from the spark plug and disconnect the spark plug using a spark plug wrench. 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!!! It takes a Bosch WSR6F or NGK BPMR7A. Sometimes it kicks and the rope pulls right out of my hand. When the fuel starts to turn stale, it gums up and clogs the carburetor just as it would in an unused lawnmower. I've been working on a Stihl 026 chainsaw that John found, and it is very hard to crank. "author": { 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. No compression when pulling start rope read more Expert Stihl ms 180 chain saw, new carb, spark plug, compression stihl ms 180 chain saw, new carb, spark plug, compression 110, new gas, still won't start what next, piston is not scored. Sometimes the spring stops working correctly due to overuse and becomes brittle. The owner is complaining of hard to pull start. Any ideas? If this does not fix the issue, it may be necessary to replace the whole starting rope system with another one. It is thus highly recommended that you drain the fuel from your chainsaw if it still has any old gasoline left in it. water will not dissolve carbon; it is far too hard to be effected. Press question mark to learn the rest of the keyboard shortcuts. NelsGarage.com All Rights Reserved 2021 Theme: Prefer by, Stihl Chainsaw Troubleshooting & How-to Guide. 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. I'm hearing thats just the nature of the beast. }, Unscrew the spark plug using a ratchet and screw the compression gauge in its place. "width": 200, Then, use a wire brush to remove all the carbon build-up from the cylinder and piston. 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. Chainsaws are very powerful tools, and if theyre not properly maintained, they can easily overcompress the chain, which can cause it to break. Turn off the choke by pressing the control lever to activate the fast idle. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. I get it going now and its easier but its still a bear. So, in our suggestion, one of the first things to check while feeling high compression is the starter spring. If cleaning does not help release oil onto the bar, the pump may be damaged and require replacing. If the coil is faulty, there will be no spark to start the engine and run the chainsaw. Typically, several reasons cause too much compression in a chainsaw and these include but are not limited to: Old contaminated chainsaw fuel Chainsaw Starter rope issues Faulty spark plugs Chainsaw Carbon buildup Insufficient Chainsaw Oil Old and contaminated fuel Does the saw have a compression release? Back to top derwen1959 Long Time User 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 A large engine has a huge capacity in its motor. Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when starting. You never try to get it to run with the choke on. Detailed, well-researched, and accurate home and garden information presented in an understandable format is our primary goal. Not sure it would accomplish anything on a 2-stroke chain saw engine. When there is too much fuel, it will not ignite, and the engine wont start. Check the spark plug and replace it if needed. Also, remove the muffler and check for carbon buildup. runs way too fast. No compression when pulling start rope. Try blowing the crankcase out with air. Get it ported and it brings it to another level. The Stihl chainsaw uses a four-position lever ignition system called the master control lever. It is harmful to your machine to use old fuel. How big a fella are ya? How Much Compression Should A Chainsaw Have - Toolsadvisorpro $75.00. 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. 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. 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. My question is what is causing the trigger to not slow down. 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. Chainsaw compression too much. Won't start. - YouTube Not sure I would do it to a saw, but the engine is running at rather high rpm when the water is sprayed into the carb air inlet. Too much carbon will do that, check the piston top and combustion chamber. Register today and take advantage of membership benefits. Normally it's not a problem but if it was already difficult to pull it could be. #3. An example of data being processed may be a unique identifier stored in a cookie. Also take the spark plug out and do the same. Starter fluids spray can help in those conditions Before pulling shoulder. "@context":"https://schema.org", Thank you for the responses. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Cleaned it all up, and had it tuned up. Free shipping. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. A heavy-duty engine gets hot faster and works better than a cold engine. In most cases, a buildup of carbon under the rings presses the rings against the cylinder, culminating in compression of the cylinder. I hope you understand the problems why your chainsaw is hard to pull. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Check the saws exterior for loose bolts, nuts, and screws and tighten them with an adjustable wrench or screwdriver. NelsGarage will share the knowledge Ive gathered about different tools and give you tips to accomplish your DIY projects faster. The compression limit should also be doubled if the engine capacity is 100 CC. Tighten the tension screw with a screwdriver to tighten the chain around the bar. There is no idle when I release the trigger. Pull the rope until it starts. The power of the motor of an engine is measured in its capacity. In this case fixing or repairing is required or worst replacing the engine all at once. You will notice the compression less. With the choke engaged, pull the starting rope several times again, and the chain saw should start on the third pull. If oil is in there it is what makes the engine feel like it is almost locked up. First thing I'd check is the pull start assy. 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. How Much Does it Cost to Install a Garage Door Opener? in the, All Rights Reserved. Let saw run until its warmed up, and go cut wood. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. Advanced arborist chainsaw with a top handle and STIHL M-Tronic technology. The chain oil will keep the chain lubricated, keep off dirt and allow smooth movement. read more Vince O. It very often kicks back and pulls the starter rope back in. I can probably find one with at most 65 PSI. Now, how much compression the engine of a chainsaw needs depends upon its motor capacity and temperature. Without proper compression, the engine will not be able to suck and use the fuel for combustion. If the reading is below or above the required range, then your ignition coil requires changing. STIHL Chainsaws FAQs | STIHL Product FAQs | STIHL USA Stihl 026 Chainsaw hard to crank - retrofit compression relief valve Cleaned air filters and both were very dirty. Would have to remove spark plug and rinse cylinder with gas to be able to start. Replace with a new starter house Problem 2: Damaged pulley system Solution: 1. STIHL 026 HARD TO PULL - Yesterday's Tractors That is the nature of a 250. It's from not pulling hard enough. Use of this Web site constitutes acceptance of our. I'm also going to double check it has the correct resistor type spark plug. The excess gas can be cleared simply by removing the plug and operating the starter a few times. The ignition coil transmits electricity to the spark plug to create a spark that ignites the engine. water will not dissolve carbon; it is far too hard to be effected. A drastic and frankly silly thing to do though . Dont substitute it with. Wipe off any dirt and debris and check for any signs of damages. I think that's what I'd do. 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. Fine adjust everything and both saws start Normal now. Keep in mind that good maintenance and storage will reduce breakdowns and maintain your tools performance throughout its lifetime. The Pulley compartment plays a massive role in retracting the ignition rope. check the cylinder & piston for carbon build-up, how much compression Does the chainsaw Engine need, How To Reset Echo 58-Volt Battery Charger. Try blowing the crankcase out with air. It is effortless to check the starter spring; pull the ignition rope. I would suspect the timing is too early. "mainEntityOfPage": { Chainsaw has too much compression - Tool Talk Forum 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. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) Pull the starter rope until you hear the first sign of it firing with a small burp. JavaScript is disabled. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. Check the chainsaws fuel if you have not used the tool for a while. Try blowing the crankcase out with air. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. It's an older saw I bought at a garage sale. Don't put water into the 2 stroke. I would never put water in it! SPONSORED. The carburetors work in a chainsaw engine allows the right amount of fuel and air mixture into the combustion chamber. Fine adjust everything and both saws start Normal now. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. I hook up a drill to the nut on the clutch and start hard starting saws that way . On a 2 stroke the water would go into the crank case first and pool up. A clear sign that you may have a chainsaw engine is when you smell gas while starting it. "text": "My chainsaw has gotten very hard to pull the rope. Remove the spark plugs and the e-clips attached to the sprocket on the engine shaft. { Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. "width": 200, You will notice the compression less. Stihl 291 chainsaw too much compression Check the compression of the engine. If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. I've seen it happen a couple times. For 503552201 Cylinder Compression Plug Package Include: 3 x Cylinder Plug Cylinder Compression Plug 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. Take off the muffler or the carb to get access. Stihl MS250 too much compression - Arborist, Chainsaw & Tree Work Forum 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. how much compression should a Stihl 044 have? - TractorByNet Hello. 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. If the starter spring is keep working correctly, it will retract the ignition rope. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Winterizing a pool is an important step in maintaining the longevity and health of your pool. If A two cycle engine gets flooded BADLY, oil can separate from the gas mix, accumulate in the crankcase and creates an hydrostatc lock. 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. Blup throttle to bring it down to idle. Being new carb, wasn't looking that direction educate a non mechanic. If the rails are shallow, you need to replace them. When this pressure, or compression, is too low or high, the chainsaw . When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Any help out thereEGBinOR Get you some Sea Foam at the local auto parts store. If it looks physically fine after cleaning it and you havent changed it in a few seasons, you should still replace it. I would suspect the timing is too early. What worked with my MS440 kicking problem should also work with that one. But it was stolen along with other tools around 1990. Other than damaged parts, using the choke position to start a warm saw often causes a flooded engine. Check the electrode gap of the spark plug and ensure it is 0.02 inches. As the chain moves over the bar, it spreads the oil across the moving parts to reduce friction and heat. What ratio mix is he using? I've seen a 20psi drop with the wrong type of gauge to be pretty common. Mar 24, 2019. Soaking in water will do nothing but rust things up . 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. Reddit and its partners use cookies and similar technologies to provide you with a better experience. 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. We are compensated for referring traffic and business to Amazon and other companies linked to on this site. Remove the filter, engine control lever and Stihl carburetor. When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. 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. A two-stroke gas-powered chainsaw uses relatively few moving parts. 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. 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. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Most times, when the Stihl chainsaw stops working, it is never a complete breakdown. That is what was told to me by the area distributor technician. My husky 266xp has been that away from newjust pull over slow for 2 or 3 times and then try cranking.. 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?? Ron Cook. It runs good after I get it started. By getting your pool ready for the winter, you can make sure it will be ready to use in the spring. Can anyone make a suggestion. Don't know what to do at this point. I bought 2 032 Stihl saws at auction that pulled very hard. Sometimes, this might be triggered by another problem that is impacting your system. As far as compression, you can usually tell by how the saw pulls when starting it. It's also going to be wise to try to put the chainsaw somewhere that isn't exposed to constant sunlight since that can be a contributing factor to the oxidation. I think that's what I'd do. It runs good after I get it started. So, If you feel too much compression while pulling a chainsaw, the possible reasons might be as below. Guido 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. Stihl MS250 hard to pull? in Chainsaws - The Forestry Forum Make sure it's greased and the bushings are good. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. 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 describe all the possible issues and also suggest the solutions to fix them too. The saw runs and starts great. If it has to do with small engines, it's welcome here. 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! Hope this helps. Help, can't pull start Stihl MS250 chainsaw, too much compression I hook up a drill to the nut on the clutch and start hard starting saws that way . 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. We will explain the causes of high compression and how you can quickly fix it to make it run smoothly. Below are the reasons the chain keeps coming loose and how to fix it. If there is any damage to the pulley at any stage, it will cause High Compression or stiffness during a pull.. If you experience low compression, pull the muffler and check the piston and cylinder for, Read More How Much Compression Should a Chainsaw HaveContinue, The possible reasons can be the battery not being charged, properly connected, or dead. A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. Stihl chainsaw compression test | Bob Is The Oil Guy Pull the recoil off and check for binding Pull rope or starter pawls misaligned. That is a high compression saw, pull the rope slowly until you feel resistance then give it a short quick pull. 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. This site is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. A cold engine will need the compression of 50-100 PSI whereas a hot engine will require compression above 150 PSI. Why Is My Chainsaw Hard to Pull? (5 Things to Check) Spark plugs that are not functioning properly are another probable cause of excessive compression. The vibration of the tool during use can run some fasteners loose, preventing it from starting again. If a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. To test the recoil starter, remove it and reposition the spring. Confirm the spark plug gap, check and adjust with a feeler gauge or gaping tool. It is best to put a new plug in after clearing. Turn the brake off. Modern View Forum powered by phpBB 2001, 2005 phpBB Group. Don't put water into the 2 stroke. Some of the contributing reasons include a full tank of oil, carbon buildup on the exhaust system, and malfunctioning spark plugs. 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. First, remove the spark plug from the chainsaw. Temperature Of The Engine A heavy-duty engine gets hot faster and works better than a cold engine. However, you still have to confirm the size of the gap before installing. The spark arrestor in a chainsaw traps exhaust products emitted from an internal combustion engine. The plug should be tight against your thumb. Doesnt pull at all or just hard to pull. A smaller gap will cause a weak spark and poor ignition of the engine, while a wider gap will not bring out any spark. You can follow the steps on how to troubleshoot and revive it when it wont start. The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. Take better care of your chainsaw and perform regular maintenance according to the manufacturers recommendations to prevent any of these problems. 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. Subsequent starts are just as hard. Posted December 27, 2017. The spark plug is located in the engine and ignites the fuel and air mixture, driving the piston and running the engine. The flywheel is loose? Then Google "decarb". A clogged carburetor wont allow fuel into the engine, preventing it from starting. This compression converts fuel (any source) into the potential energy in the engine to start it. Once youve done that, reassemble the chainsaw, which should work properly again. I have plenty of engines with REALLY low compression that I'll be glad to swap him. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. Runs well, except it. My name is Chris Ross. "@type": "Person", } Admitted Woodaholic. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. 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 Stihl MS 250 Chain Saw: The pull start will barely move the flywheel. Your ignition rope must be intact properly with the pulley to work correctly. }. Stihl chain saw too much compression I had to take it apart The saw feels good in my hands and its got a surprising amount of power. Convenient, durable and robust with minimum weight, the STIHL MS 260 can come with a number of optional features to make the job even easier. I bought 2 032 Stihl saws at auction that pulled very hard. Suitable Replacement Stihl MS 250 C Compression Release Parts Stihl Chainsaw Troubleshooting & How-to Guide - Nels Garage Make sure it fits snug. For a better experience, please enable JavaScript in your browser before proceeding. A faulty spark plug will have carbon, dirt, and oil blocking the insulator nose, preventing it from firing consistently. Pull the starter rope until you hear the first sign of it firing with a small burp. 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. Therefore, it does not need any compression rate to start. 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. Don't put water into the 2 stroke. I think you'll like it. Yes I tried that last time and it did help some. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Reassemble the chainsaw, refill the fuel tank, crank the engine and check for oil along the bar. Every chainsaw needs to have some compression to ensure that it operates well.
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