I have a MS250 that has come up on compression since new. pulls with little resistance, similar to my farm boss. Hello. Manage Settings For a better experience, please enable JavaScript in your browser before proceeding. If the chainsaw is too little compression, it may start easily but will not run smoothly. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. We and our partners use cookies to Store and/or access information on a device. If there is any damage to the pulley at any stage, it will cause High Compression or stiffness during a pull.. Other than damaged parts, using the choke position to start a warm saw often causes a flooded engine. It is best to put a new plug in after clearing. The exhaust side of the piston is a warm gold. First thing I'd check is the pull start assy. A chainsaw with no spark will shut down suddenly or not start at all. If repeated cleaning does not fully unclog the carburetor, you will have to replace it. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. A chainsaw is going to be exposed to oxidation over time, but you can at least limit the process by storing your chainsaw well. Finally the fuel will be converted into energy. And some will have more. When the air that reaches the chain saw's engine is insufficient, it becomes prone to overheating. Once youve done that, reassemble the chainsaw, which should work properly again. It prevents the carburetor from allowing too much fuel into the combustion chamber. 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. anthonyg_ma Original Author 16 years ago Canguy, thnks for the tips! If cleaning does not help release oil onto the bar, the pump may be damaged and require replacing. 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. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. 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. You are misunderstanding WHY water is put into carboned up engines. 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. Also, remove the muffler and check for carbon buildup. It is like there is too much compression. If you find the brake drum moving, you must replace the needle bearing. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. Most fuels nowadays are a blend of ethanol which attracts moisture and speeds up the rotting process. 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. The owner is complaining of hard to pull start. "@type": "InteractionCounter", You're familiar with how to start a stihl yes? Could your gauge be off a little? Quoting Removed, click Modern View to see Don't put water in the saw-ever. While rope attached to a pulley, the further connection of the pulley is with springs and pawl to make sure the pulley is tensioned and helps in retracting and spinning. If it does maybe it is plugged. My question is what is causing the trigger to not slow down. "image": { Make sure it's greased and the bushings are good. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. 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. It is thus highly recommended that you drain the fuel from your chainsaw if it still has any old gasoline left in it. Below we have discussed the most common reasons why your chainsaw wont idle and the best way to fix it. As the chain moves over the bar, it spreads the oil across the moving parts to reduce friction and heat. You will notice the compression less. When the motor warms up after about a minute, turn on the choke position. Loosen the nuts holding the clutch cover and disconnect the chain shroud and remove the oil plate. Most Stihl chainsaws have a resistance of 0.2-3.0 ohm on the primary coil and 5-20 kiloohm on the secondary coil but always confirm the correct reading for your model number. You need to pull the exhaust to check that. It's also possible the piston or cylinder are scored or carboned up. Lift the bars nose and tighten the nuts on the sidebar to secure the sidebar and guide bar in place. However, you still have to confirm the size of the gap before installing. Doesnt pull at all or just hard to pull. It may not display this or other websites correctly. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", $49.99. The flywheel is loose? 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. I;ve read somewhere to put water? Thanks. Check if the wires are damaged or broken and replace them if necessary. "height": 57 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. John Deere and its logos are the registered trademarks of the John Deere Corporation. Does the saw have a compression release? or Best . Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. water will not dissolve carbon; it is far too hard to be effected. 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. Currently I live in Austin, United States. Over time or when using the wrong fuel, the fuel filter becomes too clogged and restricts fuel flow, killing the engine shortly after starting. It will be apparent if it is, but usually a scored saw won't run good, if at all. Stihl is a leading manufacturer of chainsaws and other handheld outdoor and landscaping power tools. 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. My name is Chris Ross. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. Usually, this happens when you use a chainsaw after a very long time or by wear and tear of the rope. in the. Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. Advanced arborist chainsaw with a top handle and STIHL M-Tronic technology. What is the minimum compression for my STIHL chainsaw? }, My one and only MS250 was a kicker to start it but that was the only problem. The excess gas can be cleared simply by removing the plug and operating the starter a few times. Carboned rings will decrease not increase compression. 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. check the cylinder & piston for carbon build-up, how much compression Does the chainsaw Engine need, How To Reset Echo 58-Volt Battery Charger. Ask him if he's drop-starting it. There is no idle when I release the trigger. 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. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. A large engine has a huge capacity in its motor. 24" is what I've got on mine, but it can handle a bigger bar. Register today and take advantage of membership benefits. The saw feels good in my hands and its got a surprising amount of power. Most times, when the Stihl chainsaw stops working, it is never a complete breakdown. Disengage the chain brake, turn on the ignition switch and install the new spark plug into the rubber connector. Take off the muffler or the carb to get access. The excess gas can be cleared simply by removing the plug and operating the starter a few times. This can lead to serious injuries, including cuts and amputations. That is the nature of a 250. "name": "Egbinor" 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. Try blowing the crankcase out with air. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. Don't know what to do at this point. 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. In a similar vein, if the wrong kind of oil is used, the compression may be increased. If any of these components are worn or broken, the chain saw wont start even with fuel. It would give you rusted bearings. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. }, I have had the cylinder off. Does the saw have a compression release? Check for clogged shafts and jets, clogged carburetor, damaged valves, stuck levers, and damaged or warped diaphragms, all of which can interfere with the fueling process. Let saw run until its warmed up, and go cut wood. 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. What worked with my MS440 kicking problem should also work with that one. Another big issue that causes too much high compression is the lack of oil in the starter system. Pull the starter rope until you hear the first sign of it firing with a small burp. In this case fixing or repairing is required or worst replacing the engine all at once. Once the 250 is running, its fine. 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 you recently refueled your Stihl chainsaw, stale gas can be a reason why it wont start. Remove the spark plug with a spark plug wrench and clean it with a brush to remove carbon scoring and dirt. Would have to remove spark plug and rinse cylinder with gas to be able to start. what and or where is the metering lever.? Check the spark plug and replace it if needed. A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. A two-stroke gas-powered chainsaw uses relatively few moving parts. A faulty spark plug will have carbon, dirt, and oil blocking the insulator nose, preventing it from firing consistently. Posted December 27, 2017. Make sure the gap is according to the specifications of your chainsaws engine. How Many Amps Does a Garage Door Opener Use? Reddit and its partners use cookies and similar technologies to provide you with a better experience. water will not dissolve carbon; it is far too hard to be effected. 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. 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. 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 hook up a drill to the nut on the clutch and start hard starting saws that way . Although this is often true, it is not always the case. All it needs is a few inches missing and it will pull too hard like the compression is too high. 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. Any help out thereEGBinOR Get you some Sea Foam at the local auto parts store. Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when starting. How To Fix Chainsaw Battery Charger Blinking Red? The first step is to remove the cover that covers the spark plug on your chainsaw. Sometimes, the ignition rope is frayed or stuck inside the starter housing. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . water will not dissolve carbon; it is far too hard to be effected. We got rid of both of those useless things . That model is extremely easy to flood. If this is the case, you may want to try lubricating the rope to see if it would assist to resolve the difficulties. The plug should be tight against your thumb. Im Nelson, a DIY enthusiast with a bottomless can-do attitude. Low pressure, 20 to 30 pounds is all you need. Thank you for the responses. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. 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. Try it, it may just do the trick! A drastic and frankly silly thing to do though . The power of the motor of an engine is measured in its capacity. You can follow the steps on how to troubleshoot and revive it when it wont start. Consequently, always use the right oil and make sure that your chain saws starting mechanism is lubricated to prevent excessive compression while starting the saw. Check the saws exterior for loose bolts, nuts, and screws and tighten them with an adjustable wrench or screwdriver. Don't put water into the 2 stroke. How does it feel with the spark plug removed? The compression limit should also be doubled if the engine capacity is 100 CC. If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. Create an account to follow your favorite communities and start taking part in conversations. Didnt somehow get straight oil in the cylinder did you? Check for side play in the crankshaft. Check the choke of the chainsaws engine and make sure it is completely closed. 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! If you buy another battery, make sure it has the same voltage and amperage as the old battery. 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. 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 has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. "mainEntityOfPage": { I usual only choke my MS250 for one pull and no longer have the flooding issue. The key on the flywheel is in place and not sheered. Remove ignition coil and muffler. no, afraid I don't have equipment to test. $75.00. If that is true, I'd suspect that the timing is off and why it's ripping the cord from your hand. Modern View Forum powered by phpBB 2001, 2005 phpBB Group. First thing I'd check is the pull start assy. On a 2 stroke the water would go into the crank case first and pool up. When the oil pimp or oiler is faulty, it will reduce the chainsaws performance and power. I luv my 064. Required fields are marked *. "headline":"Chainsaw has too much compression", Stihl MS 250 Chain Saw: The pull start will barely move the flywheel. I think that's what I'd do. { If the starter spring is keep working correctly, it will retract the ignition rope. 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. Chainsaws are very powerful tools, and if theyre not properly maintained, they can easily overcompress the chain, which can cause it to break. If oil is in there it is what makes the engine feel like it is almost locked up. If it is the right sparkplug and not flooded, I would maybe buy a different saw with easy start. Locate the tension adjustment screws to the side of the chainsaw guide bar. The choke position is the fourth setting on the master control lever. The ignition system is responsible for igniting the fuel and air mixture to produce energy that powers the chainsaw. i have a ms 250. Help, can't pull start Stihl MS250 chainsaw, too much compression. Compression is measured by using a simple screw-in gauge. By checking & repairing/replacing these, you can fix the issue. The following have been addressed. The Stihl 066 chainsaw uses the same type of engine most gasoline-powered yard tools use, a two-cycle combustion engine. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. When the fuel starts to turn stale, it gums up and clogs the carburetor just as it would in an unused lawnmower. Pull trigger and set full choke. The spark arrestor in a chainsaw traps exhaust products emitted from an internal combustion engine. You can unclog the carburetor if the clog is minor. It does not take much to increase the compression. 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. That is a high compression saw, pull the rope slowly until you feel resistance then give it a short quick pull. The end of the tester must protrude exact the same volume into the cylinder as the spark plug or the reading will be wrong. A 250 has a fair amount of compression for a smaller saw but not that bad. If you see any unusual movement of spring, then take it in to replace it. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. If the reading is below or above the required range, then your ignition coil requires changing. Do that to the starter side when you're looking at the starter assy. If the compression is not produced in the engine at an appropriate level, it will not be able to convert fuel into energy. Replaced the chain and did some serious cutting and was so pleased. The chain oil will keep the chain lubricated, keep off dirt and allow smooth movement. Hold the tip of the blade and adjust the tension of the chain correctly. Confirm the spark plug gap, check and adjust with a feeler gauge or gaping tool. To fix this problem, turn off the chain saw and let it sit for about 30 minutes to allow the excess gas to evaporate. It was easier to pull after I cleaned it up, but still tough. 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. It was metering lever. Stihl oil has been used. You are misunderstanding WHY water is put into carboned up engines. Uninstall the spark arrestor and unblock it using a brush, but you can also replace it for efficiency. Stihl MS290 MS390 MS310 Chainsaw Has Oil Tank Engine Housing Assembly OEM/ Bin G . Poke the oil feed hole with a 16-gauge wire to unclog it until it slides through the hole smoothly. If you suspect a compression issue, seek professional help as compression repairs can be complicated. For a better experience, please enable JavaScript in your browser before proceeding. That is the nature of a 250. 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. Dont substitute it with. 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. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. 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, (quoted from post at 00:57:42 08/18/17) My chainsaw has gotten very hard to pull the rope. I've done it to high hour Kohler engines many times. How Much Compression Should a Chainsaw Have. I hook up a drill to the nut on the clutch and start hard starting saws that way . Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. Some of our partners may process your data as a part of their legitimate business interest without asking for consent.