A 50CC engine needs 150 PSI compression. Block the spark plugs hole by putting a nylon rope to prevent the piston from moving. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. Move the selector lever up one position immediately or the saw will flood on the very next pull. 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. A chainsaw is going to be exposed to oxidation over time, but you can at least limit the process by storing your chainsaw well. Animated Two Stoke Engine Air Cycle, My husky 266xp has been that away from newjust pull over slow for 2 or 3 times and then try cranking.. My husky 266xp has been that away from newjust pull over slow for 2 or 3 times and then try cranking.. There is no carbon build up and all looks like new. . "interactionType": "https://schema.org/CommentAction", No carbon on top or on roof of cylinder. 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. Also take the spark plug out and do the same. The early 064, 044, 066 came with a red master control. NelsGarage.com All Rights Reserved 2021 Theme: Prefer by, Stihl Chainsaw Troubleshooting & How-to Guide. 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. Would have to remove spark plug and rinse cylinder with gas to be able to start. chain saw compression release mod. That is a high compression saw, pull the rope slowly until you feel resistance then give it a short quick pull. Wipe off lubricant and grime from the bar with a clean rag. Check the chain oiler and ensure it is functional. 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. A lot of variables might contribute to excessive compression while using a chainsaw. A heavy-duty chainsaw requires a large amount of compression, whereas a chainsaw with a smaller engine needs less compression to convert fuel into energy. Winterize Your Pool Like a Pro: A Comprehensive Guide for Home owners. Confirm the spark plug gap, check and adjust with a feeler gauge or gaping tool. I can probably find one with at most 65 PSI. I bought it used around 1978. Don't know what to do at this point. More information can be found on this page. By checking & repairing/replacing these, you can fix the issue. I'm also going to double check it has the correct resistor type spark plug. If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . "@type": "Organization", However, these moving parts, to stay moving, require a substantial amount of compression. Too much carbon will do that, check the piston top and combustion chamber. or very unlikely but happened to me on an 041 make sure the crank hasn't shifted and started to bind. Has someone invented a new kind of two stroke motor? Register today and take advantage of membership benefits. The owner is complaining of hard to pull start. For a better experience, please enable JavaScript in your browser before proceeding. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . After that, using a ratchet, remove the spark plug from the engine. I have a MS250 that has come up on compression since new. 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. Start new topic; Recommended Posts. Press question mark to learn the rest of the keyboard shortcuts. water will not dissolve carbon; it is far too hard to be effected. Sometimes the spring stops working correctly due to overuse and becomes brittle. 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. When the oil pimp or oiler is faulty, it will reduce the chainsaws performance and power. Also, remove the muffler and check for carbon buildup. A very loose chain will cause the blades to come out of the bar, while a very tight chain is also not ideal for the proper functioning of the chainsaw. An engine is fit on the rear side of a chainsaw. If A two cycle engine gets flooded BADLY, oil can separate from the gas mix, accumulate in the crankcase and creates an hydrostatc lock. 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. A hot engine also requires more compression to convert furl into energy as compared to the colder one. Tighten the tension screw with a screwdriver to tighten the chain around the bar. Reddit and its partners use cookies and similar technologies to provide you with a better experience. A highly compressed engine will not be able to work smoothly because of the too much pressure on engine and you will find it hard to start the engine. lol. Carboned rings will decrease not increase compression. "headline":"Chainsaw has too much compression", If that is true, I'd suspect that the timing is off and why it's ripping the cord from your hand. Pull the recoil off and check for binding Pull rope or starter pawls misaligned. Uninstall the spark arrestor and unblock it using a brush, but you can also replace it for efficiency. Take off the muffler or the carb to get access. First thing I'd check is the pull start assy. 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. I have a MS250 that has come up on compression since new. Mar 22, 2017. The Stihl chainsaw uses a four-position lever ignition system called the master control lever. What are the numbers on your sparkplug? Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. Remove the spark plug with a spark plug wrench and clean it with a brush to remove carbon scoring and dirt. 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. Why Is My Chainsaw Hard to Pull? (5 Things to Check) Cleaned air filters and both were very dirty. Detailed, well-researched, and accurate home and garden information presented in an understandable format is our primary goal. And some will have more. Obviously, the motor, which has a huge capacity, will require more compression. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. It would give you rusted bearings. 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. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. 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. Gas with ethanol also burns hotter than gasoline which can cause the engine to overheat and burn the plug electrodes. A drastic and frankly silly thing to do though . Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. Any chance is it hydro locking because of gas? 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. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. Neighbor brought me his Stihl MS250 complaining that it tries to pull his arm from socket when starting. Locate the spark plug from the top of the engine underneath the chain brake handle. You should also make sure the new gas you use is appropriate for the chainsaw. Pull the starter rope until you hear the first sign of it firing with a small burp. Check for side play in the crankshaft. What worked with my MS440 kicking problem should also work with that one. It works when cold-starting the engine, when the engine is idle and when the engine is open. Thus far, you have learned how to diagnose most problems with the Stihl chainsaw and how to fix the issues. If the chainsaw is too much compression, it may be difficult to start. }, The following have been addressed. Im Nelson, a DIY enthusiast with a bottomless can-do attitude. Every chainsaw requires a different compression level according to its built-up and model number. If oil is in there it is what makes the engine feel like it is almost locked up. That is what was told to me by the area distributor technician Check for side play in the crankshaft. Pull the rope until it starts. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. After initial pull on rope (which feels like vapor lock on cylinder), saw will start on second or third pull. I hook up a drill to the nut on the clutch and start hard starting saws that way . If your chainsaw doesnt automatically turn it off or you forget, the engine cuts off immediately. It was easier to pull after I cleaned it up, but still tough. I would never put water in it! Maybe the piston is hitting 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. The ignition coil transmits electricity to the spark plug to create a spark that ignites the engine. 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 Quoting Removed, click Modern View to see What?? It can be from something as simple as starting the chainsaw wrongly to more severe issues like a damaged carburetor. Just wondering what your opinions are of the lowest compression you can run a Stihl MS250 at. 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. Doesnt pull at all or just hard to pull. Any help out thereEGBinOR Get you some Sea Foam at the local auto parts store. Turn the engine to get under the piston and blow the crankcase out. Over time or when using the wrong fuel, the fuel filter becomes too clogged and restricts fuel flow, killing the engine shortly after starting. 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. It is significantly tougher to pull over than an 024 or the new 241. If it does maybe it is plugged. Check the spark plug and replace it if needed. 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. An example of data being processed may be a unique identifier stored in a cookie. We describe all the possible issues and also suggest the solutions to fix them too. Soaking in water will do nothing but rust things up . "userInteractionCount": 23 Take off the muffler or the carb to get access. My question is what is causing the trigger to not slow down. It is typical for the Stihl chainsaw to develop some issues, and when this happens, some basic troubleshooting will help identify the source of the issue and solution to help it run smoothly. When you are doing a cold start, push the choke lever to the warm start when the engine starts to run. Pull the starter rope until you hear the first sign of it firing with a small burp. Quoting Removed, click Modern View to see That would be quite the trick to get the oil to separate out of the gas, LOL. Stihl chainsaw compression test | Bob Is The Oil Guy Turn the idle speed clockwise until the saw idles and chain turns, and then make a one-fourth counterclockwise turn. 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. It's an older saw I bought at a garage sale. Remove ignition coil and muffler. I'll even do the labor for free. The chainsaw motor engine capacity can range from 30CC and 50CC to 150 CC. You will notice the compression less. I would suspect the timing is too early. With the choke engaged, pull the starting rope several times again, and the chain saw should start on the third pull. My Chain Saw Is Smoking & Overheating | Hunker It is effortless to check the starter spring; pull the ignition rope. 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. That would have to be some puddle of oil for a MS250 to have a "bar oil leaking in and causing high compression problems" What kind of Stihl oil regular or synthitc, had an 025 years ago that was a real knuckel buster never checked compression but was using regular Stihl oil. You can unclog the carburetor if the clog is minor. My /Sthil 034 is very difficult to start. Quoting Removed, click Modern View to see Don't put water in the saw-ever. #3. "dateModified": "2017-08-17", 4 Possible Problems & Solutions Problem 1: Damaged starter housing Solution: 1. You never try to get it to run with the choke on. Ron Cook. Welcome! Continue with Recommended Cookies. Stihl Chainsaw Troubleshooting & How-to Guide - Nels Garage 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. The ideal pressure range of the Stihl chainsaw is between 90 and 110 psi. You're familiar with how to start a stihl yes? It runs good after I get it started. Clean any mildly dirty parts and replace all the damaged parts. If oil is in there it is what makes the engine feel like it is almost locked up. This could be understood by reading the further explanation below. How To Fix Chainsaw Battery Charger Blinking Red? after that I'd be looking at crank bearings. If the compression is not produced in the engine at an appropriate level, it will not be able to convert fuel into energy. Carboned rings will decrease not increase compression. As the starter, spring plays a vital role in running starter assembly smoothly. How Much Does it Cost to Install a Garage Door Opener? If you introduce an extremely fine trickle of water into a running engine through the carburettor that may remove some carbon . Chainsaw excessive compression - TractorByNet The choke position is the fourth setting on the master control lever. 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. Stihl chainsaw compression test Joe_Power Jun 2, 2015 Not open for further replies. Press question mark to learn the rest of the keyboard shortcuts. I bought 2 032 Stihl saws at auction that pulled very hard. Are you sure the starter rope isn't a little too short? Therefore, it does not need any compression rate to start. 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. The owner is complaining of hard to pull start. You have an option to either pull off the starter and clean it or look for an ideal replacement for your starter house. 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 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. Also take the spark plug out and do the same. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. We're all about fixing small engines, from carburetor rebuilds, to crankshaft machining. Additionally, most spark plugs come pre-gapped. It will be apparent if it is, but usually a scored saw won't run good, if at all. We got rid of both of those useless things . It will be apparent if it is, but usually a scored saw won't run good, if at all. I think that's what I'd do. To ensure that enough air reaches the chain saw's engine, remove the air filter and clean or replace it, depending on the manufacturer's instructions. So, in our suggestion, one of the first things to check while feeling high compression is the starter spring. "image": { Get you some Sea Foam at the local auto parts store. Would not be afraid to do it to a 4, 6, or V-8. 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. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Why Does My Chainsaw Have Too Much Compression? If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. Don't put water into the 2 stroke. That is the nature of a 250. Any ideas? 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 Register today and take advantage of membership benefits. Not sure it would accomplish anything on a 2-stroke chain saw engine. Try it, it may just do the trick! We will explain the causes of high compression and how you can quickly fix it to make it run smoothly. No compression when pulling start rope read more Expert Stihl ms 180 chain saw, new carb, spark plug, compression stihl ms 180 chain saw, new carb, spark plug, compression 110, new gas, still won't start what next, piston is not scored. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. Also check the air filters and make sure they are clean. You can prevent the new starter rope from fraying by burning the two ends of the rope. check the cylinder & piston for carbon build-up, how much compression Does the chainsaw Engine need, How To Reset Echo 58-Volt Battery Charger. Wash the dirty filter with a non-abrasive detergent and water. Because of an absence of lubrication, the chain saw system becomes brittle, resulting in excessive compression of the chain saw mechanism. 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 Poke the oil feed hole with a 16-gauge wire to unclog it until it slides through the hole smoothly. Stihl Chainsaw Ms170 for sale | eBay JavaScript is disabled. There are sprays (power tune) for removing carbon, but I doubt if that's your problem. How does it feel with the spark plug removed? Low pressure, 20 to 30 pounds is all you need. The exhaust side of the piston is a warm gold. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. "description":"Discussion of Chainsaw has too much compression in the Tool Talk forum followed by comments. Another big issue that causes too much high compression is the lack of oil in the starter system. Usually, this happens when you use a chainsaw after a very long time or by wear and tear of the rope. How to Test Stihl 180 Compression CIMFLOK.COM 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. It is possible however to flood a two stroke which can cause the plug to fowl. I was given (estate) a small McCulloch chain saw and it started and ran great. Your ignition rope must be intact properly with the pulley to work correctly. Thanks! 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. As long as I can get it going.. 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. 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. in the. How Much Compression Should A Chainsaw Have - Toolsadvisorpro Are you sure the starter rope isn't a little too short? If you still have questions regarding high chainsaw compression, you can discuss them in the comments. $20.00 shipping. Repair or replace the damaged part 2. Locate the tension adjustment screws to the side of the chainsaw guide bar. If a chainsaw has a 2 stroke engine, then the maximum compression it requires is 110-130 PSI. If oil is in there it is what makes the engine feel like it is almost locked up. "@id": "https://www.yesterdaystractors.com/" Remove the ignition coil, test it using a multimeter or an ignition coil tester, and confirm your chainsaw models resistance specification. A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. Wipe off any flammable fluid from the metal surface of the engine with a clean rag. It does not take much to increase the compression. Garden Guides | Compression Tricks for Chainsaws Guido Quoting Removed, click Modern View to see What?? Keep in mind that the stuck ignition rope can also damaged other parts inside the starter assembly. Getting these problems resolved is a rather straightforward process. If it is not physically damaged, clean it with clean gasoline and a rag. Loosen the nuts and bolts clockwise and then pull out the oil pump gently. Temperature Of The Engine A heavy-duty engine gets hot faster and works better than a cold engine. 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. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. I thought all the fuel was out but there was some in the line yet. I think that's what I'd do. It is possible however to flood a two stroke which can cause the plug to fowl. 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 too damaged, you should replace it. "width": 200, read more Vince O. Indoor fly traps are an effective way to keep insects away from your home. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. If you regularly use the chainsaw, then there might be the possibility that your starter spring breaks off. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", The consent submitted will only be used for data processing originating from this website. How Much Compression Should a Stihl 066 Have? - SFGATE Don't put water into the 2 stroke. First, remove the spark plug from the chainsaw. That is what was told to me by the area distributor technician, 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.