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. Check the choke of the chainsaws engine and make sure it is completely closed. 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. "@type": "Person", Reddit and its partners use cookies and similar technologies to provide you with a better experience. If your chainsaw doesnt automatically turn it off or you forget, the engine cuts off immediately. Gas with ethanol also burns hotter than gasoline which can cause the engine to overheat and burn the plug electrodes. It's also possible the piston or cylinder are scored or carboned up. Save my name, email, and website in this browser for the next time I comment. Stihl ms 291 hard to pull start? Here's How to Fix It Quickly 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. Recognised as a leading saw in the forestry industry, it is available in guide bar lengths 13"/32cm to 18"/45cm. My Chain Saw Is Smoking & Overheating | Hunker Take off the muffler or the carb to get access. Below are the reasons the chain keeps coming loose and how to fix it. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. However, you still have to confirm the size of the gap before installing. It had a compression release, and it started and ran well. 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. We are compensated for referring traffic and business to Amazon and other companies linked to on this site. A compression gauge is used to measure the compression of a chainsaw which works similarly to the tire gauge. Locate the tension adjustment screws to the side of the chainsaw guide bar. If it looks physically fine after cleaning it and you havent changed it in a few seasons, you should still replace it. What is the minimum compression for my STIHL chainsaw? Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. On a 2 stroke the water would go into the crank case first and pool 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. Detailed, well-researched, and accurate home and garden information presented in an understandable format is our primary goal. Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. Check for clogging around the bar oil. Chainsaw excessive compression - TractorByNet The other cause of your chainsaws high compression could be the stuck ignition rope. 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 "publisher": { Poke the oil feed hole with a 16-gauge wire to unclog it until it slides through the hole smoothly. Replaced the chain and did some serious cutting and was so pleased. I have a MS250 that has come up on compression since new. Turn the engine to get under the piston and blow the crankcase out. Getting these problems resolved is a rather straightforward process. If it does maybe it is plugged. An engine is fit on the rear side of a chainsaw. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. John Deere and its logos are the registered trademarks of the John Deere Corporation. If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. read more Vince O. Use of this Web site constitutes acceptance of our. Try taking it out, Then holding the trigger while you pull fast. If you recently refueled your Stihl chainsaw, stale gas can be a reason why it wont start. Register today and take advantage of membership benefits. I've seen a 20psi drop with the wrong type of gauge to be pretty common. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. }. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. Any help out thereEGBinOR Get you some Sea Foam at the local auto parts store. Repair or replace the damaged part 2. A clear sign that you may have a chainsaw engine is when you smell gas while starting it. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . 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! Let saw run until its warmed up, and go cut wood. If it is hard to pull, then check how the spring is performing. When the fuel starts to turn stale, it gums up and clogs the carburetor just as it would in an unused lawnmower. "name": "Egbinor" Are you sure the starter rope isn't a little too short? You are using an out of date browser. Don't know what to do at this point. 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. Stihl MS250 hard to pull? in Chainsaws - The Forestry Forum Thank you for the responses. Manage Settings 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. You can unclog the carburetor if the clog is minor. Trying to rotate the chain while a huge piece of wood is . Sparkplug was correct but I think it was a little flooded. Pull trigger and set full choke. Small Engine Technician Being in the cutting services for more than 10 years, I know a thing or two about chainsaw. 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. Check the spark plug and replace it if needed. Would have to remove spark plug and rinse cylinder with gas to be able to start. We got rid of both of those useless things . 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. It will be apparent if it is, but usually a scored saw won't run good, if at all. OEM GOOD USED STIHL 048AV CHAINSAW SHORT BLOCK ENGINE 120 PSI COMPRESSION. Press J to jump to the feed. water will not dissolve carbon; it is far too hard to be effected. I hope you understand the problems why your chainsaw is hard to pull. Yeah, I must have flooded it as I was working on it. The chain clutch might be, Read More Cordless Chainsaw Wont StartContinue, The most common reason is simply the wrong battery. The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when starting. For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. 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. "interactionStatistic": { As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. You can use a ratchet to do the task. How Much Compression Should a Stihl 066 Have? - SFGATE Once youve done that, reassemble the chainsaw, which should work properly again. That is a high compression saw, pull the rope slowly until you feel resistance then give it a short quick pull. When there is no air for the spark to ignite, the chainsaw will start and then die after a short while. A chainsaw Battery blinking red is one of the most frustrating things a woodcutter can, Read More How To Fix Chainsaw Battery Charger Blinking Red?Continue, The standard compression reading required for most 2-cycle chainsaw is around 100-110 psi to start. 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. The consent submitted will only be used for data processing originating from this website. Quoting Removed, click Modern View to see What?? If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . after that I'd be looking at crank bearings. 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. I love to write about chainsaw for homeowners and professionals. You may also want to go ahead and replace the plug. Tighten the tension screw with a screwdriver to tighten the chain around the bar. All it needs is a few inches missing and it will pull too hard like the compression is too high. Didnt somehow get straight oil in the cylinder did you? Stihl is a leading manufacturer of chainsaws and other handheld outdoor and landscaping power tools. I've done it to high hour Kohler engines many times. Help, can barley pull Stihl MS250, too much compression The early 064, 044, 066 came with a red master control. 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. 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. Follow the steps below on how to fix a flooded chainsaw engine. Don't put water into the 2 stroke. If the coil is faulty, there will be no spark to start the engine and run the chainsaw. Quoting Removed, click Modern View to see Don't put water in the saw-ever. It does not take much to increase the compression. 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. The piston and rings are very shiney. You can prevent the new starter rope from fraying by burning the two ends of the rope. Best Professional Chainsaw Reviews 2022 - Pro Tool Reviews It will be apparent if it is, but usually a scored saw won't run good, if at all. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. The saw is about 2 years old, light use. It may not display this or other websites correctly. If I drop start it I can pull it through 1 compression stroke. Here is how to troubleshoot a malfunctioning spark plug. Stihl MS290 Hard to pull recoil | Hearth.com Forums Home It's also possible the piston or cylinder are scored or carboned up. That is the nature of a 250. 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. Stihl chain saw too much compression I had to take it apart A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips. First thing I'd check is the pull start assy. The Pulley compartment plays a massive role in retracting the ignition rope. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. The second thing, Read More Stihl Chainsaw Charger Not WorkingContinue, Your email address will not be published. When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. "@id": "https://www.yesterdaystractors.com/" I get it going now and its easier but its still a bear. 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. Final step: removing the old spark plug and installing the new one. A large engine has a huge capacity in its motor. Does the saw have a compression release? I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Too much carbon will do that, check the piston top and combustion chamber. }, 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. Remove the spark plugs and the e-clips attached to the sprocket on the engine shaft. You are misunderstanding WHY water is put into carboned up engines. in the cylinder overnight because the rings are cerboned up? The key on the flywheel is in place and not sheered. The excess gas can be cleared simply by removing the plug and operating the starter a few times. Remove ignition coil and muffler. I used to have a Homelite that would do that if I left gas in it. 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. Sometimes, the ignition rope is frayed or stuck inside the starter housing. It would give you rusted bearings. If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. 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. Rinse the filter and allow it to air dry before reinstalling it. Without proper compression, the engine will not be able to suck and use the fuel for combustion. Wipe off any dirt and debris and check for any signs of damages.