If it is too damaged, you should replace it. I went with a meteor piston/cylinder set. Pull the rope until it starts. The recoil starter in a chainsaw is a start mechanism that allows you to pull the rope. It may not display this or other websites correctly. The choke should be closed during a cold start to limit the air and increase the fuel in the engine to keep it running while it warms up. 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. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. I've done it to high hour Kohler engines many times. I used to have a Homelite that would do that if I left gas in it. Compression problems are usually due to an air leak in the engine, usually around the gaskets and seals of the crankshaft. Hold the tip of the blade and adjust the tension of the chain correctly. Would have to remove spark plug and rinse cylinder with gas to be able to start. "height": 57 A clogged carburetor wont allow fuel into the engine, preventing it from starting. Use a screw wrench to loosen the nuts on the guide bar side panel to give you room to adjust the chain. Compression gauges are not always accurate and different engines will provide different results. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Sometimes it kicks and the rope pulls right out of my hand. Take better care of your chainsaw and perform regular maintenance according to the manufacturers recommendations to prevent any of these problems. If the compression is not produced in the engine at an appropriate level, it will not be able to convert fuel into energy. Trying to rotate the chain while a huge piece of wood is . Remove the entire carburetor and clean it. "image": { Now it has sat since the last use and I went to start it and it turned over maybe three times and the compression . If A two cycle engine gets flooded BADLY, oil can separate from the gas mix, accumulate in the crankcase and creates an hydrostatc lock. If there is any damage to the pulley at any stage, it will cause High Compression or stiffness during a pull.. Gas with ethanol also burns hotter than gasoline which can cause the engine to overheat and burn the plug electrodes. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. If it does maybe it is plugged. Press question mark to learn the rest of the keyboard shortcuts. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. Is the spark plug the correct one for the saw? If it is flooded that should clear it up. Finally the fuel will be converted into energy. water will not dissolve carbon; it is far too hard to be effected. This can lead to serious injuries, including cuts and amputations. 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. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. All it needs is a few inches missing and it will pull too hard like the compression is too high. It is usual for the chainsaw chains to come off with continued use, but there is usually an underlying cause when its too repetitive. For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. You are misunderstanding WHY water is put into carboned up engines. "@type": "ImageObject", Cleaned air filters and both were very dirty. They're easy to use and inexpensive, so if you are considering buying one for your home, there are a few quick things you Consumers in the Home and Garden sector turn to us for answers to their nagging questions about various goods and services. }, Wipe off any flammable fluid from the metal surface of the engine with a clean rag. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Not sure it would accomplish anything on a 2-stroke chain saw engine. I'll even do the labor for free. When the spark plug is removed, the engine turns Ask an Expert Car Questions Small Engine Troubleshooting JON, Small Engine Technician 2,680 Satisfied Customers Certified Small Engine Technician JON is online now Related Small Engine Questions Make sure it fits snug. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. 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. Im Nelson, a DIY enthusiast with a bottomless can-do attitude. Friction is usually the cause of a rope failing to draw when it should. Would not be afraid to do it to a 4, 6, or V-8. Wipe off the excess fuel from the spark plug with a clean rag. If you still have questions regarding high chainsaw compression, you can discuss them in the comments. 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. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . 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. Unscrew the spark plug wrench using a spark plug from the engine. Hello. The excess gas can be cleared simply by removing the plug and operating the starter a few times. Remove the spark plugs and the e-clips attached to the sprocket on the engine shaft. Thanks. Then Google "decarb". Take off the muffler or the carb to get access. I was given (estate) a small McCulloch chain saw and it started and ran great. That is what was told to me by the area distributor technician That is the nature of a 250. 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?? 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. There might be a small stone or thing that is stuck inside the starter and causes the rope not to retract. . Soaking in water will do nothing but rust things up . Spark plugs that are not functioning properly are another probable cause of excessive compression. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. Sometimes an adapter is needed to make a tight fit. idle. Now, how much compression the engine of a chainsaw needs depends upon its motor capacity and temperature. Normally it's not a problem but if it was already difficult to pull it could be. Most fuels nowadays are a blend of ethanol which attracts moisture and speeds up the rotting process. 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 owner is complaining of hard to pull start. Every chainsaw engine has a different capacity depending upon its motor power. Rinse the filter and allow it to air dry before reinstalling it. Indoor fly traps are an effective way to keep insects away from your home. If it is the right sparkplug and not flooded, I would maybe buy a different saw with easy start. Then, use a wire brush to remove all the carbon build-up from the cylinder and piston. 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. I tried draining the crankcase with the saw upside . I used to have a Homelite that would do that if I left gas in it. "height": 57 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. Clean any mildly dirty parts and replace all the damaged parts. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. 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. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. 24" is what I've got on mine, but it can handle a bigger bar. You can clean and mildly clogged carburetor but if it is too severe, replace it with one compatible with your chainsaw model. 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. How Many Amps Does a Garage Door Opener Use? If it does maybe it is plugged. OEM GOOD USED STIHL 048AV CHAINSAW SHORT BLOCK ENGINE 120 PSI COMPRESSION. This article will help you fix the most commonly reported problems of a Stihl chainsaw. As the starter, spring plays a vital role in running starter assembly smoothly. Don't put water into the 2 stroke. 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. "width": 200, Back to top derwen1959 Long Time User 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 In a similar vein, if the wrong kind of oil is used, the compression may be increased. Check for side play in the crankshaft. 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. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. 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. Make sure it is snug but can also move freely by hand. 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 I've done it to high hour Kohler engines many times. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. Also take the spark plug out and do the same. Create an account to follow your favorite communities and start taking part in conversations. or Best Offer. Thus far, you have learned how to diagnose most problems with the Stihl chainsaw and how to fix the issues. This Indoor Fly Traps: 5 Things You Didn't Know About Indoor Fly Traps. How Much Does it Cost to Install a Garage Door Opener? So, replacing the ignition rope is a better option to keep everything working smoothly without any damage. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Choke cannot be used even when engine cold, or flooding occurs. By checking & repairing/replacing these, you can fix the issue. I would never put water in it! Pull the rope until it starts. Every chainsaw needs to have some compression to ensure that it operates well. A heavy-duty engine gets hot faster and works better than a cold engine. everything is harder in a tree, not a conclusive test. The saw is about 2 years old, light use. what and or where is the metering lever.? Do that to the starter side when you're looking at the starter assy. 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. I have a MS250 that has come up on compression since new. Little two stroke motors as on chainsaws have to have a lot of compression to make the needed power. I;ve read somewhere to put water? We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. If cleaning does not help release oil onto the bar, the pump may be damaged and require replacing. Too much hot or cold engine does not work or even start to produce vacuum pressure inside engine. I would suspect the timing is too early. If repeated cleaning does not fully unclog the carburetor, you will have to replace it. 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. It is possible however to flood a two stroke which can cause the plug to fowl. There is no idle when I release the trigger. This is because each machine is made differently and has various needs. You will notice the compression less. An engine is fit on the rear side of a chainsaw. A large engine has a huge capacity in its motor. 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. Each chainsaw has a different level of compression. JavaScript is disabled. Compression is measured by using a simple screw-in gauge. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) Unscrew the spark plug using a ratchet and screw the compression gauge in its place. Make sure the gap is according to the specifications of your chainsaws engine. 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. If your chainsaw doesnt automatically turn it off or you forget, the engine cuts off immediately. Step 1: Prepare the chainsaw Remove the spark plug from the chainsaw. You are using an out of date browser. As long as I can get it going.. More information can be found on this page. The consent submitted will only be used for data processing originating from this website. Press question mark to learn the rest of the keyboard shortcuts. "@type": "WebPage", The lack of oil dries the chainsaw assembly, which causes high compression and becomes very difficult for you to handle the chainsaw. }, Don't know what to do at this point. A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips. Don't know what to do at this point. After all these operations are carried out, it is necessary to once again clean the saw from dirt, then turn it upside down and unscrew the four screws securing the engine to the chainsaw body. 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. If you suspect a compression issue, seek professional help as compression repairs can be complicated. We got rid of both of those useless things . Wipe off lubricant and grime from the bar with a clean rag. 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 hook up a drill to the nut on the clutch and start hard starting saws that way . I would never put water in it! Follow the steps below on how to fix a flooded chainsaw engine. 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. I;ve read somewhere to put water? The spark plug is located in the engine and ignites the fuel and air mixture, driving the piston and running the engine. We're all about fixing small engines, from carburetor rebuilds, to crankshaft machining. Sparkplug was correct but I think it was a little flooded. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. If so, show him how to start it on the ground with his foot in it or with the rear handle between his thighs. Are you sure the starter rope isn't a little too short? 1. saw has new carb 2. flywheel has been removed and key inspected. Turn the idle speed clockwise until the saw idles and chain turns, and then make a one-fourth counterclockwise turn. Other than damaged parts, using the choke position to start a warm saw often causes a flooded engine. Ron Cook. Of all the Stihl saws, the MS250 is the toughest to start in relation to it's size. Fine adjust everything and both saws start Normal now. Your chainsaws compressive strength is measured with the use of a screw-in gauge. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. No carbon on top or on roof of cylinder. water will not dissolve carbon; it is far too hard to be effected. 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. With the choke engaged, pull the starting rope several times again, and the chain saw should start on the third pull. The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. It's also possible the piston or cylinder are scored or carboned up. Carbon buildup is yet another important factor in the increasing compression experienced by chain saws over time. On a 2 stroke the water would go into the crank case first and pool up. I've been working on a Stihl 026 chainsaw that John found, and it is very hard to crank. However, if I push downward on the trigger button, it slows down to. Most times, when the Stihl chainsaw stops working, it is never a complete breakdown. The early 064, 044, 066 came with a red master control. $99.95. Consequently, operating this chainsaw becomes a really difficult chore to do. It is thus highly recommended that you drain the fuel from your chainsaw if it still has any old gasoline left in it. "author": { First thing I'd check is the pull start assy. An excessive amount of compression in your chainsaws starting rope could also be indicated by the beginning rope failing to draw. 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. I can probably find one with at most 65 PSI. If that doesnt work, try gently tapping on the side of the bulb with a screwdriver or other tool. Admitted Woodaholic. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Check the saws exterior for loose bolts, nuts, and screws and tighten them with an adjustable wrench or screwdriver. The saw runs and starts great. Even though it was purchased "brand new" I'm not so sure. Don't know what to do at this point. It is harmful to your machine to use old fuel. Also check the air filters and make sure they are clean. Poke the oil feed hole with a 16-gauge wire to unclog it until it slides through the hole smoothly. I luv my 064. Stihl MS 250 Chain Saw: The pull start will barely move the flywheel.