Wipe off lubricant and grime from the bar with a clean rag. I bought 2 032 Stihl saws at auction that pulled very hard. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. This is because each machine is made differently and has various needs. If the rails are shallow, you need to replace them. 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. It does not take much to increase the compression. 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. 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. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. I tried draining the crankcase with the saw upside . If the reading is below or above the required range, then your ignition coil requires changing. check the cylinder & piston for carbon build-up, how much compression Does the chainsaw Engine need, How To Reset Echo 58-Volt Battery Charger. 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. Versions MS 260, Bar length 37cm, RSC 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?? idle. I would suspect the timing is too early. Turn the brake off. water will not dissolve carbon; it is far too hard to be effected. Would not be afraid to do it to a 4, 6, or V-8. Stihl recommends using 89 octane gasoline without ethanol, and the gas should not contain more than 10% ethanol. I'm hearing thats just the nature of the beast. You may also want to go ahead and replace the plug. Just wondering what your opinions are of the lowest compression you can run a Stihl MS250 at. If it is not physically damaged, clean it with clean gasoline and a rag. However, if I push downward on the trigger button, it slows down to. 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. If I drop start it I can pull it through 1 compression stroke. For a better experience, please enable JavaScript in your browser before proceeding. Cylinder Compression Plug Applicable Model For STIHL 021, 023, 024, 025, 026, 044, 046, 066, MS210, MS230, MS240, MS250, MS260, MS341, MS360, MS440, MS460, MS650, MS660 Chainsaw Parts Refer To Part No. Stihl chainsaw compression test Joe_Power Jun 2, 2015 Not open for further replies. Remove the spark plugs and the e-clips attached to the sprocket on the engine shaft. If it does maybe it is plugged. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", We will explain the causes of high compression and how you can quickly fix it to make it run smoothly. Your ignition rope must be intact properly with the pulley to work correctly. If it is the right sparkplug and not flooded, I would maybe buy a different saw with easy start. Soaking in water will do nothing but rust things up . In other words, the problem is in the trigger itself, not a. carb adjustment screw. 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. Back to top derwen1959 Long Time User 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 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 other reason might be the use of the wrong type of oil for the climate. 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. I get it going now and its easier but its still a bear. I hope my epic guides will help you to choose,buy and maintain chainsaw. I love to write about chainsaw for homeowners and professionals. What is the minimum compression for my STIHL chainsaw? Carbon buildup is yet another important factor in the increasing compression experienced by chain saws over time. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Indoor fly traps are an effective way to keep insects away from your home. I went with a meteor piston/cylinder set. Currently I live in Austin, United States. Hello. 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. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. #3. Make sure it's greased and the bushings are good. Reassemble the chainsaw, refill the fuel tank, crank the engine and check for oil along the bar. This compression converts fuel (any source) into the potential energy in the engine to start it. Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. Some of the contributing reasons include a full tank of oil, carbon buildup on the exhaust system, and malfunctioning spark plugs. Final step: removing the old spark plug and installing the new one. Below are the reasons the chain keeps coming loose and how to fix it. You have an option to either pull off the starter and clean it or look for an ideal replacement for your starter house. As a result of using bad fuel or leaving fuel in the chainsaw for a long time, the fuel evaporates and leaves behind a sticky substance that accumulates and clogged the carburetor. The lack of oil dries the chainsaw assembly, which causes high compression and becomes very difficult for you to handle the chainsaw. It's an older saw I bought at a garage sale. Don't put water into the 2 stroke. "@context":"https://schema.org", water will not dissolve carbon; it is far too hard to be effected. Any chance is it hydro locking because of gas? A drastic and frankly silly thing to do though . Thanks! Starter fluids spray can help in those conditions Before pulling shoulder. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. 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. The starter assembly often fails to rotate due to a weak connection between the pulley and the ignition rope. $99.95. There is no carbon build up and all looks like new. I have plenty of engines with REALLY low compression that I'll be glad to swap him. of compression. Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. A lot of variables might contribute to excessive compression while using a chainsaw. read more Vince O. Try taking it out, Then holding the trigger while you pull fast. Remove the right side cover, bar, and chain. Youre familiar with how to start a stihl yes? The carburetor is a significant part of the chainsaw. Turn the idle speed clockwise until the saw idles and chain turns, and then make a one-fourth counterclockwise turn. 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. 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. I've done it to high hour Kohler engines many times. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. Without proper compression, the engine will not be able to suck and use the fuel for combustion. Take off the muffler or the carb to get access. Has someone invented a new kind of two stroke motor? I;ve read somewhere to put water? Stihl 251 chainsaw. Pull the rope until it starts. Even though it was purchased "brand new" I'm not so sure. We and our partners use cookies to Store and/or access information on a device. 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. Would not be afraid to do it to a 4, 6, or V-8. How To Fix Chainsaw Battery Charger Blinking Red? "@type": "ImageObject", When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. A compression gauge is used to measure the compression of a chainsaw which works similarly to the tire gauge. 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! Create an account to follow your favorite communities and start taking part in conversations. I bought it used around 1978. The plug should be tight against your thumb. By checking & repairing/replacing these, you can fix the issue. It is usual for the chainsaw chains to come off with continued use, but there is usually an underlying cause when its too repetitive. Use a screw wrench to loosen the nuts on the guide bar side panel to give you room to adjust the chain. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. 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 I'd do. The end of the tester must protrude exact the same volume into the cylinder as the spark plug or the reading will be wrong. Then Google decarb . Check for side play in the crankshaft. 24" is what I've got on mine, but it can handle a bigger bar. Don't know what to do at this point. 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. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. Replace the spark plug with a new identical. If you do not replace the starter spring on time, it will cause you to replace the whole starter assembly. Required fields are marked *. 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. "userInteractionCount": 23 Welcome! Pull trigger and set full choke. If anything prevents the right amount of fuel into the combustion chamber, the chainsaw wont start. Ron Cook. You will notice the compression less. To fix this problem, turn off the chain saw and let it sit for about 30 minutes to allow the excess gas to evaporate. 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. 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. 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. Let saw run until its warmed up, and go cut wood. I have a MS250 that has come up on compression since new. Get it ported and it brings it to another level. or Best . Yeah, I must have flooded it as I was working on it. More information can be found on this page. If the chainsaw is too much compression, it may be difficult to start. 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. We are compensated for referring traffic and business to Amazon and other companies linked to on this site. If oil is in there it is what makes the engine feel like it is almost locked up. 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. Consequently, operating this chainsaw becomes a really difficult chore to do. If not I'm honestly kinda stumped. Fine adjust everything and both saws start Normal now. 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. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. A drastic and frankly silly thing to do though . It is best to put a new plug in after clearing. Can anyone make a suggestion. The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. Cleaned air filters and both were very dirty. 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. I;ve read somewhere to put water? A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. The exhaust is black but no build up. 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. Finally the fuel will be converted into energy. This article will help you fix the most commonly reported problems of a Stihl chainsaw. in the. 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. So, If you feel too much compression while pulling a chainsaw, the possible reasons might be as below. Thanks. The saw runs and starts great. 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 MS192T Chainsaw Fuel Oil Tank Engine Housing Assembly OEM. The Stihl chainsaw is a two-stroke gas-powered tool that uses a substantial amount of compression to pull fuel from the tank, mix it with air and ignite it to produce energy that runs the chainsaw. I was given (estate) a small McCulloch chain saw and it started and ran great. Turn the engine to get under the piston and blow the crankcase out. No compression when pulling start rope. I've seen a 20psi drop with the wrong type of gauge to be pretty common. Recognised as a leading saw in the forestry industry, it is available in guide bar lengths 13"/32cm to 18"/45cm. 1. saw has new carb 2. flywheel has been removed and key inspected. It takes a Bosch WSR6F or NGK BPMR7A. 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. If it is hard to pull, then check how the spring is performing. You're familiar with how to start a stihl yes? And some will have more. Ensure the chain fits snugly inside of the bar and the teeth that keep it in place are not worn down too low. Compression gauges are not always accurate and different engines will provide different results. Generally covering everything under 25 HP. 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. Could your gauge be off a little? Try blowing the crankcase out with air. ", 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! This increased distance will cause the chain to keep coming out of the guiding bar with the vibrating saw. Of all the Stihl saws, the MS250 is the toughest to start in relation to it's size. The second thing, Read More Stihl Chainsaw Charger Not WorkingContinue, Your email address will not be published. The ignition system is responsible for igniting the fuel and air mixture to produce energy that powers the chainsaw. If oil is in there it is what makes the engine feel like it is almost locked up. It will be apparent if it is, but usually a scored saw won't run good, if at all. Low pressure, 20 to 30 pounds is all you need. The choke position is the fourth setting on the master control lever. I bought 2 032 Stihl saws at auction that pulled very hard. 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. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. Has someone invented a new kind of two stroke motor? About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . The flywheel is loose? Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. An example of data being processed may be a unique identifier stored in a cookie. All it needs is a few inches missing and it will pull too hard like the compression is too high. What are the numbers on your sparkplug? On a 2 stroke the water would go into the crank case first and pool up. Choke cannot be used even when engine cold, or flooding occurs. Stihl oil has been used. Replace the fuel filters instead of cleaning them as they are pretty affordable and easy to install too. It is effortless to check the starter spring; pull the ignition rope. Stihl 291 chainsaw too much compression Check the compression of the engine. Don't know what to do at this point. Im Nelson, a DIY enthusiast with a bottomless can-do attitude. Sometimes the spring stops working correctly due to overuse and becomes brittle. It is, therefore, necessary to determine if the problem has been remedied by adding fresh fuel. water will not dissolve carbon; it is far too hard to be effected. Also check the air filters and make sure they are clean. Also take the spark plug out and do the same. It's supposed to warm up later this week so I'll be able to do some more on this chain saw. You never try to get it to run with the choke on. Get you some Sea Foam at the local auto parts store. Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? Locate the spark plug from the top of the engine underneath the chain brake handle. Soaking in water will do nothing but rust things up .