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. The consent submitted will only be used for data processing originating from this website. 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?? 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! It is basically the same product as TruFuel (same base synthetic fuel with different synthetic oil) that is sold through Stihl dealers and endorsed for use in all Stihl 2-stroke engines. The engine creates a vacuum pressure inside it. Ron Cook. If it is too damaged, you should replace it. Try it, it may just do the trick! 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 Check the spark plug of the chain saw if the engine is not starting at all. If you do not replace the starter spring on time, it will cause you to replace the whole starter assembly. If this does not fix the issue, it may be necessary to replace the whole starting rope system with another one. If that is true, I'd suspect that the timing is off and why it's ripping the cord from your hand. 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. Low pressure, 20 to 30 pounds is all you need. I think that's what happened, although I didn't think such a small amount could do it. Similarly, a 4-stroke engine needs 2 times more compression than a 2-stroke engine, around 180-210 PSI. A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. Unscrew the spark plug wrench using a spark plug from 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. I get it going now and its easier but its still a bear. 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. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. i have a ms 250. check the cylinder & piston for carbon build-up, how much compression Does the chainsaw Engine need, How To Reset Echo 58-Volt Battery Charger. A drastic and frankly silly thing to do though . Does the saw have a compression release? When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. 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 uncoils, tightens the spring, engages the clutch to start the engine. "interactionStatistic": { The spark arrestor in a chainsaw traps exhaust products emitted from an internal combustion engine. Would have to remove spark plug and rinse cylinder with gas to be able to start. A two-stroke gas-powered chainsaw uses relatively few moving parts. There is no carbon build up and all looks like new. Sounds flooded, or maybe wrong sparkplug? Move the selector lever up one position immediately or the saw will flood on the very next pull. Also, remove the muffler and check for carbon buildup. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. When the motor warms up after about a minute, turn on the choke position. let it idle over lunch, just made sure to not go too long between filling it with gas, while running of course. Check for clogging around the bar oil. 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. I have a MS250 that has come up on compression since new. 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. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Remove ignition coil and muffler. You can prevent the new starter rope from fraying by burning the two ends of the rope. Do that to the starter side when you're looking at the starter assy. Tighten the tension screw with a screwdriver to tighten the chain around the bar. Don't know what to do at this point. Compression gauges are not always accurate and different engines will provide different results. Are you sure the starter rope isn't a little too short? I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Oct 24, 2011 / Chainsaw excessive compression #1 . 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. You should also make sure the new gas you use is appropriate for the chainsaw. If the coil is faulty, there will be no spark to start the engine and run the chainsaw. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. It prevents the carburetor from allowing too much fuel into the combustion chamber. Take off the muffler or the carb to get access. If you still have questions regarding high chainsaw compression, you can discuss them in the comments. I think that's what I'd do. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. Check the chain tension and adjust it if it is too loose or tight. John Deere and its logos are the registered trademarks of the John Deere Corporation. It takes a Bosch WSR6F or NGK BPMR7A. Thanks! If there is any damage to the pulley at any stage, it will cause High Compression or stiffness during a pull.. "@type": "Organization", If you recently refueled your Stihl chainsaw, stale gas can be a reason why it wont start. If that doesnt work, try gently tapping on the side of the bulb with a screwdriver or other tool. Sparkplug was correct but I think it was a little flooded. Trying to rotate the chain while a huge piece of wood is . Make sure there is oil in the engine. Whether you are a beginner or a professional woodworker, knowing how to fix your chainsaw will save you time and money seeking help from a service center. Required fields are marked *. Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. Here is how to troubleshoot a malfunctioning spark plug. Loosen the nuts holding the clutch cover and disconnect the chain shroud and remove the oil plate. 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. Carboned rings will decrease not increase compression. Can also be used with hedge trimmer attachment HS 246. If it is not physically damaged, clean it with clean gasoline and a rag. The compression limit should also be doubled if the engine capacity is 100 CC. lol. 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. If your chainsaw doesnt automatically turn it off or you forget, the engine cuts off immediately. Check if the wires are damaged or broken and replace them if necessary. Make sure you have a gauge with a schrader valve right at the tip of the spark plug adapter or you will get a low reading every time. I would suspect the timing is too early. Maybe the piston is hitting it. Obviously, the motor, which has a huge capacity, will require more compression. Don't put water into the 2 stroke. Turn off the choke by pressing the control lever to activate the fast idle. A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. Make sure it's greased and the bushings are good. As far as compression, you can usually tell by how the saw pulls when starting it. Dont substitute it with. It runs good after I get it started. 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. Thank you for the responses. I bought 2 032 Stihl saws at auction that pulled very hard. Replace with a new starter house Problem 2: Damaged pulley system Solution: 1. or Best Offer. The Stihl chainsaw comes with a sturdy body, strong teeth, and a smooth rotating bar to help you cut through trees, ice, and even concrete with ease and precision. Fine adjust everything and both saws start Normal now. All it needs is a few inches missing and it will pull too hard like the compression is too high. I'm an arborist by profession & a blogger by passion. To ensure correct functioning and to prevent excessive compression, you might have to repair worn-out parts with new ones. I believe it was flooded, but I didn't think that little bit of fuel would make it that hard to pull but I guess so since it can't compress! Please use the navigational links to explore our website. Welcome! The starter assembly often fails to rotate due to a weak connection between the pulley and the ignition rope. My /Sthil 034 is very difficult to start. The first step is to remove the cover that covers the spark plug on your chainsaw. 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 of compression. Chainsaws are very powerful tools, and if theyre not properly maintained, they can easily overcompress the chain, which can cause it to break. I;ve read somewhere to put water? Stihl chainsaw compression test Joe_Power Jun 2, 2015 Not open for further replies. Temperature Of The Engine A heavy-duty engine gets hot faster and works better than a cold engine. 1. saw has new carb 2. flywheel has been removed and key inspected. If it does maybe it is plugged. 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. 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. Would have to remove spark plug and rinse cylinder with gas to be able to start. You are misunderstanding WHY water is put into carboned up engines. Replace the spark plug with a new identical. The plug should be tight against your thumb. Stihl MS290 MS390 MS310 Chainsaw Has Oil Tank Engine Housing Assembly OEM/ Bin G . I thought all the fuel was out but there was some in the line yet. Stihl 024 - Sherlock Holmes issue - help needed here. It will be apparent if it is, but usually a scored saw won't run good, if at all. This may sometimes jam your chainsaws rings, causing it to become inoperable. 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. That is what was told to me by the area distributor technician That is the nature of a 250. 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. Unscrew the clutch assembly on top of the oil pump. $799.99 CHOOSE AN OPTION Deliver From Store e.g., 123 Your Street, Virginia Beach, VA 12345 Add to Cart Order Online - Pick Up In Store Currently Shopping At: JC Licht Ace Hardware-Bridgeport (773) 523-8888 Change My dealer Features STIHL M-Tronic The exhaust is black but no build up. Try it, it may just do the trick! Pour starting fluid into the carburetor and crank the engine several times. Advanced arborist chainsaw with a top handle and STIHL M-Tronic technology. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. 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. Does the saw have a compression release? You need to pull the exhaust to check that. You will notice the compression less. I changed to synthitic. Starting fluid will make the fuel more combustible and makes the process of clearing out the combustion chamber much quicker. After initial pull on rope (which feels like vapor lock on cylinder), saw will start on second or third pull. 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. Therefore, it does not need any compression rate to start. To ensure that enough air reaches the chain saw's engine, remove the air filter and clean or replace it, depending on the manufacturer's instructions. Stihl is a leading manufacturer of chainsaws and other handheld outdoor and landscaping power tools. Likewise, low compression in the engine will be slow and retarding and it is a warning sign of leakage in your engine. Thanks. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. You can also quickly fix this anomaly by ensuring a proper troubleshooting of the pulley compartment to find damages. Hello. Flooding usually happens due to an underlying issue: a bad spark plug, bad gas, or a faulty carburetor. A 250 has a fair amount of compression for a smaller saw but not that bad. $20.00 shipping. Keep in mind that the stuck ignition rope can also damaged other parts inside the starter assembly. in the, All Rights Reserved. { First, remove the spark plug from the chainsaw. A faulty spark plug will have carbon, dirt, and oil blocking the insulator nose, preventing it from firing consistently. If oil is in there it is what makes the engine feel like it is almost locked up. JavaScript is disabled. Reassemble the chainsaw, refill the fuel tank, crank the engine and check for oil along the bar. My name is Chris Ross. Back to top derwen1959 Long Time User If you suspect a compression issue, seek professional help as compression repairs can be complicated. Stihl MS192T Chainsaw Fuel Oil Tank Engine Housing Assembly OEM. The carburetors work in a chainsaw engine allows the right amount of fuel and air mixture into the combustion chamber. Final step: removing the old spark plug and installing the new one. If the chainsaw is too little compression, it may start easily but will not run smoothly. Uninstall the spark arrestor and unblock it using a brush, but you can also replace it for efficiency. Free shipping. 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. Pull the starter rope until you hear the first sign of it firing with a small burp. I hook up a drill to the nut on the clutch and start hard starting saws that way . Compression is measured by using a simple screw-in gauge. after that I'd be looking at crank bearings. Then, use a wire brush to remove all the carbon build-up from the cylinder and piston. Finally the fuel will be converted into energy. Pull trigger and set full choke. I'm also going to double check it has the correct resistor type spark plug. 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. To test the recoil starter, remove it and reposition the spring. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . Pull the rope until it starts. If it has damaged parts, replace it with a carburetor kit that fits your chainsaw model. If anything prevents the right amount of fuel into the combustion chamber, the chainsaw wont start. To fix this problem, turn off the chain saw and let it sit for about 30 minutes to allow the excess gas to evaporate. "@type":"DiscussionForumPosting", Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. This compression converts fuel (any source) into the potential energy in the engine to start it. Below are the reasons the chain keeps coming loose and how to fix it. I usual only choke my MS250 for one pull and no longer have the flooding issue. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. The other reason might be the use of the wrong type of oil for the climate. NelsGarage.com All Rights Reserved 2021 Theme: Prefer by, Stihl Chainsaw Troubleshooting & How-to Guide. I've got four other Stihl saws here, an 029, 036Pro, 015L, and an MS200T, only the 36Pro pulls this hard and only if I don't use the decomp button. I would suggest clearing the cylinder by pulling the rope with the plug out. I love to write about chainsaw for homeowners and professionals. after that I'd be looking at crank bearings. The saw runs and starts great. 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. Carboned rings will decrease not increase 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. The following have been addressed. Gas with ethanol also burns hotter than gasoline which can cause the engine to overheat and burn the plug electrodes. 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. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. Lift the bars nose and tighten the nuts on the sidebar to secure the sidebar and guide bar in place. Sometimes the spring stops working correctly due to overuse and becomes brittle. It's supposed to warm up later this week so I'll be able to do some more on this chain saw. My question is what is causing the trigger to not slow down. Check the electrode gap of the spark plug and ensure it is 0.02 inches. . Doesnt pull at all or just hard to pull. Once the 250 is running, its fine. Wipe off the excess fuel from the spark plug with a clean rag. Every chainsaw requires a different compression level according to its built-up and model number. I've been working on a Stihl 026 chainsaw that John found, and it is very hard to crank. If the compression is not produced in the engine at an appropriate level, it will not be able to convert fuel into energy. 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?? Use of this Web site constitutes acceptance of our. Would not be afraid to do it to a 4, 6, or V-8. Detailed, well-researched, and accurate home and garden information presented in an understandable format is our primary goal. The plug should be tight against your thumb. Also check the air filters and make sure they are clean. Check the choke of the chainsaws engine and make sure it is completely closed. or Best Offer. When the engine starts running, turn the choke off. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. NelsGarage will share the knowledge Ive gathered about different tools and give you tips to accomplish your DIY projects faster. Quoting Removed, click Modern View to see Don't put water in the saw-ever. 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. Then Google decarb . Without proper compression, the engine will not be able to suck and use the fuel for combustion. $75.00. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. I hope you understand the problems why your chainsaw is hard to pull. 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. no, afraid I don't have equipment to test. If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. Also take the spark plug out and do the same. Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? Always change the spark plug after 100 operating hours of the chainsaw to avoid engine problems. However, if I push downward on the trigger button, it slows down to. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. 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. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. 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. The saw is about 2 years old, light use. The early 064, 044, 066 came with a red master control. pulls with little resistance, similar to my farm boss. Don't put water into the 2 stroke. 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. I used to have a Homelite that would do that if I left gas in it. I was given (estate) a small McCulloch chain saw and it started and ran great. 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. Does the saw have a compression release? I would never put water in it! I think that's what I'd do. Sometimes, the ignition rope is frayed or stuck inside the starter housing. I bought 2 032 Stihl saws at auction that pulled very hard. 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. idle. The purpose of a choke in a chainsaw is to make cold starting more effortless, but if you do not use it properly. 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. On a 2 stroke the water would go into the crank case first and pool up. When the fuel starts to turn stale, it gums up and clogs the carburetor just as it would in an unused lawnmower. Additionally, most spark plugs come pre-gapped. Remove the air filter, wash it with detergent and water and scrub off the dirt with a brush. Any ideas? By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Also check the air filters and make sure they are clean. The other cause of your chainsaws high compression could be the stuck ignition rope. Your chainsaws compressive strength is measured with the use of a screw-in gauge. I have a MS250 that has come up on compression since new. After that, using a ratchet, remove the spark plug from the engine. Make sure it fits snug. You may also notice that the chain saw loses power during operation. 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. That is the nature of a 250. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . 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. I tried draining the crankcase with the saw upside . You can clean and mildly clogged carburetor but if it is too severe, replace it with one compatible with your chainsaw model. Several reasons can cause your Stihl chainsaw to bog down when your pull the trigger. If you regularly use the chainsaw, then there might be the possibility that your starter spring breaks off. If any of these components are worn or broken, the chain saw wont start even with fuel. Also take the spark plug out and do the same. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. Guido Quoting Removed, click Modern View to see What?? You're familiar with how to start a stihl yes? Pull the rope until it starts. 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. 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. Move the selector lever up one position immediately or the saw will flood on the very next pull. Modern View Forum powered by phpBB 2001, 2005 phpBB Group.
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