I have plenty of engines with REALLY low compression that I'll be glad to swap him. Soaking in water will do nothing but rust things up . If you recently refueled your Stihl chainsaw, stale gas can be a reason why it wont start. The owner is complaining of hard to pull start. Save my name, email, and website in this browser for the next time I comment. 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. Move the selector lever up one position immediately or the saw will flood on the very next pull. If the reading is below or above the required range, then your ignition coil requires changing. "dateModified": "2017-08-17", Fine adjust everything and both saws start Normal now. First thing I'd check is the pull start assy. Friction is usually the cause of a rope failing to draw when it should. Sounds flooded, or maybe wrong sparkplug? You never try to get it to run with the choke on. I bought 2 032 Stihl saws at auction that pulled very hard. Another big issue that causes too much high compression is the lack of oil in the starter system. 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. Stihl is a leading manufacturer of chainsaws and other handheld outdoor and landscaping power tools. 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. }, Blup throttle to bring it down to idle. 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. 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 Try blowing the crankcase out with air. Check the saws exterior for loose bolts, nuts, and screws and tighten them with an adjustable wrench or screwdriver. 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 rails are shallow, you need to replace them. A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips. If the air filter is too clogged, you should replace it. It prevents the carburetor from allowing too much fuel into the combustion chamber. I think that's what happened, although I didn't think such a small amount could do it. Stihl 024 - Sherlock Holmes issue - help needed here. However, these moving parts, to stay moving, require a substantial amount of compression. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. "@type": "InteractionCounter", Make sure the crank taper is clean and the flywheel taper also. "publisher": { Would have to remove spark plug and rinse cylinder with gas to be able to start. Get you some Sea Foam at the local auto parts store. Can anyone make a suggestion. Get it ported and it brings it to another level. All it needs is a few inches missing and it will pull too hard like the compression is too high. I used to have a Homelite that would do that if I left gas in it. Take off the muffler or the carb to get access. 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. Lift the bars nose and tighten the nuts on the sidebar to secure the sidebar and guide bar in place. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. Spark plugs that are not functioning properly are another probable cause of excessive compression. If it looks physically fine after cleaning it and you havent changed it in a few seasons, you should still replace it. Sometimes, this might be triggered by another problem that is impacting your system. If the compression is not produced in the engine at an appropriate level, it will not be able to convert fuel into energy. Sometimes it kicks and the rope pulls right out of my hand. The saw feels good in my hands and its got a surprising amount of power. To test the recoil starter, remove it and reposition the spring. We're all about fixing small engines, from carburetor rebuilds, to crankshaft machining. I would suspect the timing is too early. I got it going. Low pressure, 20 to 30 pounds is all you need. Also take the spark plug out and do the same. The plug should be tight against your thumb. Press J to jump to the feed. It's from not pulling hard enough. 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. Now, how much compression the engine of a chainsaw needs depends upon its motor capacity and temperature. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. It would give you rusted bearings. what and or where is the metering lever.? Unscrew the clutch assembly on top of the oil pump. Press question mark to learn the rest of the keyboard shortcuts. Would have to remove spark plug and rinse cylinder with gas to be able to start. If it does maybe it is plugged. 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 Has someone invented a new kind of two stroke motor? I have a MS250 that has come up on compression since new. Carbon buildup is yet another important factor in the increasing compression experienced by chain saws over time. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. Don't put water into the 2 stroke. If this does not fix the issue, it may be necessary to replace the whole starting rope system with another one. 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. runs way too fast. in the, All Rights Reserved. Pull the rope until it starts. We and our partners use cookies to Store and/or access information on a device. You can clean and mildly clogged carburetor but if it is too severe, replace it with one compatible with your chainsaw model. It had a compression release, and it started and ran well. If you suspect a compression issue, seek professional help as compression repairs can be complicated. Turn the engine to get under the piston and blow the crankcase out. When starting the motor when its col, you should engage the choke position to increase fuel intake and reduce air to allow the engine to start. Winterize Your Pool Like a Pro: A Comprehensive Guide for Home owners. It's an older saw I bought at a garage sale. JavaScript is disabled. If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. 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! This compression converts fuel (any source) into the potential energy in the engine to start it. I used to have a Homelite that would do that if I left gas in it. "headline":"Chainsaw has too much compression", 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 Remove the spark plug with a spark plug wrench and clean it with a brush to remove carbon scoring and dirt. Maybe the piston is hitting it. If that is true, I'd suspect that the timing is off and why it's ripping the cord from your hand. Over time or when using the wrong fuel, the fuel filter becomes too clogged and restricts fuel flow, killing the engine shortly after starting. #1. Pull the recoil off and check for binding Pull rope or starter pawls misaligned. Pull the starter rope until you hear the first sign of it firing with a small burp. 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. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. Turn off the choke by pressing the control lever to activate the fast idle. "name": "Egbinor" If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . A drastic and frankly silly thing to do though . Final step: removing the old spark plug and installing the new one. If there is any damage to the pulley at any stage, it will cause High Compression or stiffness during a pull.. How does it feel with the spark plug removed? Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. ", Finally the fuel will be converted into energy. Every chainsaw engine has a different capacity depending upon its motor power. The saw runs and starts great. 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. Check the spark plug of the chain saw if the engine is not starting at all. 4 Possible Problems & Solutions Problem 1: Damaged starter housing Solution: 1. Hold the tip of the blade and adjust the tension of the chain correctly. The chain clutch might be, Read More Cordless Chainsaw Wont StartContinue, The most common reason is simply the wrong battery. But it was stolen along with other tools around 1990. The recoil starter in a chainsaw is a start mechanism that allows you to pull the rope. In a similar vein, if the wrong kind of oil is used, the compression may be increased. Carboned rings will decrease not increase compression. 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. If the coil is faulty, there will be no spark to start the engine and run the chainsaw. I would never put water in it! If you refuel your chainsaw and it still won,t start, below are some of the possible causes and solutions that will get the chainsaw functioning again. If any part of a carburetor has issues, the right amount of fuel/air mixture wont pump into the chamber, therefore, preventing the engine from starting. I tried draining the crankcase with the saw upside . Generally the minimum is 110 lbs. Any help out thereEGBinOR Get you some Sea Foam at the local auto parts store. I hook up a drill to the nut on the clutch and start hard starting saws that way . Carboned rings will decrease not increase compression. Once it's removed, you can place a gauge on the place of the spark plug. Sometimes, the ignition rope is frayed or stuck inside the starter housing. There is no idle when I release the trigger. It is significantly tougher to pull over than an 024 or the new 241. after that I'd be looking at crank bearings. However, this will vary by model and compression readings alone are not enough to determine the condition of the engine. water will not dissolve carbon; it is far too hard to be effected. This is bad practice, and can damage your chainsaw. Other Professional Battery-Powered Chainsaws We Recommend: Stihl MSA 220 C-B 36V 16-inch Chainsaw: Solid design and increased power backed by Stihl's dealer network. Cleaned air filters and both were very dirty. 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. Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. It is possible however to flood a two stroke which can cause the plug to fowl. water will not dissolve carbon; it is far too hard to be effected. 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. 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. of compression. So, If you feel too much compression while pulling a chainsaw, the possible reasons might be as below. It is like there is too much compression. Don't put water into the 2 stroke. Try it, it may just do the trick! I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. That is the nature of a 250. Try it, it may just do the trick! A compression gauge is used to measure the compression of a chainsaw which works similarly to the tire gauge. Use an adjustable wrench to loosen the two nuts on both sides of the chainsaw. The correct tension of the chainsaw chain should be slightly loose on the guide bar but tight enough that you cant pull the drive links out of the bar to fix the chain tension issues; follow the steps below. #3. If it does maybe it is plugged. Stihl 251 chainsaw. I've seen a 20psi drop with the wrong type of gauge to be pretty common. "height": 57 Try blowing the crankcase out with air. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. A two-stroke gas-powered chainsaw uses relatively few moving parts. Here is a link for two stroke engine air cycle. Below we have discussed the most common reasons why your chainsaw wont idle and the best way to fix it. Even with new spark plugs in, incorrectly removing and installing the spark plugs can prevent the engine from starting. It runs good after I get it started. Wash the dirty filter with a non-abrasive detergent and water. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. The early 064, 044, 066 came with a red master control. "image": { $75.00. Does the saw have a compression release? I've done it to high hour Kohler engines many times. This could be understood by reading the further explanation below. }, Create an account to follow your favorite communities and start taking part in conversations. A cold engine will need the compression of 50-100 PSI whereas a hot engine will require compression above 150 PSI. Whether you are a beginner or a professional woodworker, knowing how to fix your chainsaw will save you time and money seeking help from a service center. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. The plug should be tight against your thumb. 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. Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. Please use the navigational links to explore our website. 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. A 250 has a fair amount of compression for a smaller saw but not that bad. Stihl chainsaw low compression diagnoses and How To Dave's Small Engines 8.89K subscribers Subscribe 17K views 2 years ago This video shows a Stihl MS310 chainsaw I have apart from low. It may not display this or other websites correctly. If you suspect a compression issue, seek professional help as compression repairs can be complicated. 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. If it is hard to pull, then check how the spring is performing. The saw is about 2 years old, light use. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. Remove the entire carburetor and clean it. Ask him if he's drop-starting it. Small Engine Technician If it has to do with small engines, it's welcome here. We got rid of both of those useless things . If the spark plug is working correctly and you have good fuel, there still has to be enough fuel in the combustion chamber for the engine to start correctly. In most cases, a buildup of carbon under the rings presses the rings against the cylinder, culminating in compression of the cylinder. The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. As far as compression, you can usually tell by how the saw pulls when starting it. It is harmful to your machine to use old fuel. When you start the chainsaw, it triggers the worm drive to engage the oiler to send oil through a port that releases onto the bar. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. Remove the right side cover, bar, and chain. Guido Quoting Removed, click Modern View to see What?? Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. To ensure correct functioning and to prevent excessive compression, you might have to repair worn-out parts with new ones. 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. Replace the spark plug with a new identical. Remove the spark plugs and the e-clips attached to the sprocket on the engine shaft. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. A drastic and frankly silly thing to do though . Replace with a new starter house Problem 2: Damaged pulley system Solution: 1. Starter fluids spray can help in those conditions Before pulling shoulder. Wipe off any flammable fluid from the metal surface of the engine with a clean rag. You are using an out of date browser. It very often kicks back and pulls the starter rope back in. Modern View Forum powered by phpBB 2001, 2005 phpBB Group. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. My first chain saw was an old Homelite EZ with a blue metal case and a 20" bar. Ron Cook. Normally it's not a problem but if it was already difficult to pull it could be. Don't know what to do at this point. 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. Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when starting. So, in our suggestion, one of the first things to check while feeling high compression is the starter spring. For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. Soaking in water will do nothing but rust things up . The purpose of a choke in a chainsaw is to make cold starting more effortless, but if you do not use it properly. 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 usual only choke my MS250 for one pull and no longer have the flooding issue. The switch might be damaged or the motor is burned out. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. If you do not replace the starter spring on time, it will cause you to replace the whole starter assembly. You are using an out of date browser. It is possible however to flood a two stroke which can cause the plug to fowl. First, remove the spark plug from the chainsaw. A heavy-duty engine gets hot faster and works better than a cold engine. Being in the cutting services for more than 10 years, I know a thing or two about chainsaw.

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