stihl chainsaw too much compression

If you suspect a compression issue, seek professional help as compression repairs can be complicated. If it does maybe it is plugged. This article will help you fix the most commonly reported problems of a Stihl chainsaw. Would have to remove spark plug and rinse cylinder with gas to be able to start. I have a MS250 that has come up on compression since new. As a result, normal compression settings will change based on the kind of chainsaw machine you are using. Carbon buildup is yet another important factor in the increasing compression experienced by chain saws over time. However, if I push downward on the trigger button, it slows down to. 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 All it needs is a few inches missing and it will pull too hard like the compression is too high. 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. Doesnt pull at all or just hard to pull. Try blowing the crankcase out with air. Quoting Removed, click Modern View to see Don't put water in the saw-ever. Quoting Removed, click Modern View to see What?? The second thing, Read More Stihl Chainsaw Charger Not WorkingContinue, Your email address will not be published. Are you sure the starter rope isn't a little too short? When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. Help, can't pull start Stihl MS250 chainsaw, too much compression. If it has to do with small engines, it's welcome here. A clogged carburetor wont allow fuel into the engine, preventing it from starting. More information can be found on this page. To fix this problem, turn off the chain saw and let it sit for about 30 minutes to allow the excess gas to evaporate. Press question mark to learn the rest of the keyboard shortcuts. Remove the spark plugs and the e-clips attached to the sprocket on the engine shaft. Dust particles in the air mix with the lubricating oil and clog up the air filter, therefore, preventing sufficient air from getting into the engine. Each chainsaw has a different level of compression. Ok folks, I'm stumped. Confirm the spark plug gap, check and adjust with a feeler gauge or gaping tool. The extra effort to pull the saw is probably due to carbon build up on the piston crown and combustion chamber. So be sure to keep your chainsaw properly maintained and avoid compression problems. We're all about fixing small engines, from carburetor rebuilds, to crankshaft machining. Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. You are misunderstanding WHY water is put into carboned up engines. When the air that reaches the chain saw's engine is insufficient, it becomes prone to overheating. water will not dissolve carbon; it is far too hard to be effected. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. 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. Therefore, most people will wonder why the chainsaw has too much compression. Small Engine Technician Disconnect the spark plug from the engine and inspect if it is damaged, eroded, or dirty. 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. If you recently refueled your Stihl chainsaw, stale gas can be a reason why it wont start. 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! ProTip: You can use a small air compressor to blow air through the air filter and get rid of the loose dust before proceeding to clean it further. If the issue persists after the addition of new fuel to the tank, there may be a fault with the gas pipelines or the fuel filters. Yes I tried that last time and it did help some. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. It is harmful to your machine to use old fuel. 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. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. Carboned rings will decrease not increase compression. 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?? Stihl is a leading manufacturer of chainsaws and other handheld outdoor and landscaping power tools. #1. First thing I'd check is the pull start assy. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. "@type": "ImageObject", water will not dissolve carbon; it is far too hard to be effected. Versions MS 260, Bar length 37cm, RSC You will notice the compression less. John Deere and its logos are the registered trademarks of the John Deere Corporation. You can check the compression by pulling the spark plug out and holding it in your hand. 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. Has anyone ever seen a stock MS250 or any stock stihl with 190psi of compression? My one and only MS250 was a kicker to start it but that was the only problem. or very unlikely but happened to me on an 041 make sure the crank hasn't shifted and started to bind. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. Stihl MS290 MS390 MS310 Chainsaw Has Oil Tank Engine Housing Assembly OEM/ Bin G . Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. "interactionType": "https://schema.org/CommentAction", } You can check the compression by pulling the spark plug out and holding it in your hand. As long as I can get it going.. "width": 200, It is a prevalent issue and can be fixed and detected easily without consulting a mechanic. water will not dissolve carbon; it is far too hard to be effected. after that I'd be looking at crank bearings. Trying to rotate the chain while a huge piece of wood is . I would suspect the timing is too early. If this does not fix the issue, it may be necessary to replace the whole starting rope system with another one. A large engine has a huge capacity in its motor. 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. That is what was told to me by the area distributor technician That is the nature of a 250. I think that's what I'd do. Ron Cook. I would never put water in it! The Stihl chainsaw uses a four-position lever ignition system called the master control lever. Youll need to clean the cylinder and piston to fix this thoroughly. If I drop start it I can pull it through 1 compression stroke. Does the saw have a compression release? If the starter spring is keep working correctly, it will retract the ignition rope. It was metering lever. So, If you feel too much compression while pulling a chainsaw, the possible reasons might be as below. Use a can of carb cleaner sprayed into the breather/filter assembly. Rinse the filter and allow it to air dry before reinstalling it. Press J to jump to the feed. Posted December 27, 2017. Use an adjustable wrench to loosen the two nuts on both sides of the chainsaw. 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. 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 You may also notice that the chain saw loses power during operation. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. I've seen it happen a couple times. I have had the cylinder off. To clean it, drain the fuel, spray some carburetor cleaner and loosen the residue with a small brush. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. Im Nelson, a DIY enthusiast with a bottomless can-do attitude. How does it feel with the spark plug removed? If this is the case, you may want to try lubricating the rope to see if it would assist to resolve the difficulties. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . Not sure it would accomplish anything on a 2-stroke chain saw engine. The excess gas can be cleared simply by removing the plug and operating the starter a few times. Check if the wires are damaged or broken and replace them if necessary. "@type": "WebPage", Locate the tension adjustment screws to the side of the chainsaw guide bar. Don't put water into the 2 stroke. Wipe off lubricant and grime from the bar with a clean rag. I usual only choke my MS250 for one pull and no longer have the flooding issue. I bought 2 032 Stihl saws at auction that pulled very hard. I hook up a drill to the nut on the clutch and start hard starting saws that way . I missed the "no carbon". "userInteractionCount": 23 In fact, Stihl thinks so highly of Motomix, that they will double the factory warranty on their Stihl 2-stroke tools if you use it. Every chainsaw needs to have some compression to ensure that it operates well. The exhaust side of the piston is a warm gold. 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. 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 looks physically fine after cleaning it and you havent changed it in a few seasons, you should still replace it. As far as compression, you can usually tell by how the saw pulls when starting it. Mar 24, 2019. 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. Every chainsaw requires a different compression level according to its built-up and model number. Don't put water into the 2 stroke. }, Turn the brake off. As the guide bar wears down with use, the bar heel- the part of the bar nearest to the drive sprocket- also wears down, which increases the distance the chain travels as the bar grooves become less effective. 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. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. Several reasons can cause your Stihl chainsaw to bog down when your pull the trigger. High compression in chainsaws is a dangerous problem that can lead to serious injuries. I've been working on a Stihl 026 chainsaw that John found, and it is very hard to crank. The spark plug is located in the engine and ignites the fuel and air mixture, driving the piston and running the engine. The carburetor is a significant part of the chainsaw. If your chainsaw doesnt automatically turn it off or you forget, the engine cuts off immediately. It would give you rusted bearings. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. What usually happens is that the guide bar gets stuck in the tree and they keep running the engine while trying to force the bar out of the tree somehow. Your email address will not be published. Try it, it may just do the trick! Ensure the wires leading to the On/Off switch are not tangled or in contact with the metal part of the engine if there is no spark. Wipe off the excess fuel from the spark plug with a clean rag. 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 may not display this or other websites correctly. The vibration of the tool during use can run some fasteners loose, preventing it from starting again. 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. I got it started. How Much Does it Cost to Install a Garage Door Opener? Would not be afraid to do it to a 4, 6, or V-8. }, The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. 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. Blup throttle to bring it down to idle. Low pressure, 20 to 30 pounds is all you need. To test the recoil starter, remove it and reposition the spring. Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. In a similar vein, if the wrong kind of oil is used, the compression may be increased. 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. Being in the cutting services for more than 10 years, I know a thing or two about chainsaw. Stihl 291 chainsaw too much compression Check the compression of the engine. Turn the engine to get under the piston and blow the crankcase out. Even with new spark plugs in, incorrectly removing and installing the spark plugs can prevent the engine from starting. Any chance is it hydro locking because of gas? I would suspect the timing is too early. The saw feels good in my hands and its got a surprising amount of power. Stihl 024 - Sherlock Holmes issue - help needed here. The lack of oil dries the chainsaw assembly, which causes high compression and becomes very difficult for you to handle the chainsaw. Hope this helps. The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. Would not be afraid to do it to a 4, 6, or V-8. The owner is complaining of hard to pull start. (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 Why is the Garage Door Opener Light Not Working? By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Try taking it out, Then holding the trigger while you pull fast. I used to have a Homelite that would do that if I left gas in it. Remove the filter, engine control lever and Stihl carburetor. Sometimes it kicks and the rope pulls right out of my hand. 4 Possible Problems & Solutions Problem 1: Damaged starter housing Solution: 1. Maybe the piston is hitting it. When you are doing a cold start, push the choke lever to the warm start when the engine starts to run. 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! "name": "Egbinor" Are you sure the starter rope isn't a little too short? 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. Below are the reasons the chain keeps coming loose and how to fix it. Does the saw have a compression release? Stihl recommends using 89 octane gasoline without ethanol, and the gas should not contain more than 10% ethanol. The ignition coil transmits electricity to the spark plug to create a spark that ignites the engine. Chainsaws are very powerful tools, and if theyre not properly maintained, they can easily overcompress the chain, which can cause it to break. . Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. It will be apparent if it is, but usually a scored saw won't run good, if at all. 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. I have plenty of engines with REALLY low compression that I'll be glad to swap him. Stihl MS192T Chainsaw Fuel Oil Tank Engine Housing Assembly OEM. Don't put water into the 2 stroke. If the rails are shallow, you need to replace them. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. Make sure it is snug but can also move freely by hand. Use recommedend chain oil lubricant. Keep in mind that the stuck ignition rope can also damaged other parts inside the starter assembly. Soaking in water will do nothing but rust things up . what and or where is the metering lever.? 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. in the. Sounds like it was broken in "right", show the guy how to start it and tell him to be happy. 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. I think you'll like it.

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