stihl chainsaw too much compression

3 9 9 comments Best Add a Comment Revolutionary-Act469 2 yr. ago Doesn't pull at all or just hard to pull. no, afraid I don't have equipment to test. Use recommedend chain oil lubricant. 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. Dont substitute it with. 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. Let saw run until its warmed up, and go cut wood. Manage Settings If you still have questions regarding high chainsaw compression, you can discuss them in the comments. How does it feel with the spark plug removed? Remove the filter, engine control lever and Stihl carburetor. 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 the nature of a 250. As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. "height": 57 Gas with ethanol also burns hotter than gasoline which can cause the engine to overheat and burn the plug electrodes. Pull the starter rope until you hear the first sign of it firing with a small burp. Clean any mildly dirty parts and replace all the damaged parts. I bought 2 032 Stihl saws at auction that pulled very hard. Make sure it fits snug. Check for clogging around the bar oil. I'll even do the labor for free. Winterize Your Pool Like a Pro: A Comprehensive Guide for Home owners. Trying to rotate the chain while a huge piece of wood is . Replace the fuel filters instead of cleaning them as they are pretty affordable and easy to install too. "height": 57 Would not be afraid to do it to a 4, 6, or V-8. Then, use a wire brush to remove all the carbon build-up from the cylinder and piston. Poke the oil feed hole with a 16-gauge wire to unclog it until it slides through the hole smoothly. The exhaust side of the piston is a warm gold. It is a prevalent issue and can be fixed and detected easily without consulting a mechanic. No compression when pulling start rope. Other than damaged parts, using the choke position to start a warm saw often causes a flooded engine. Now, the gauge might come in a number of size variations, so you need to use an adapter to make a perfect seal between the gauge and the chainsaw. The carburetors work in a chainsaw engine allows the right amount of fuel and air mixture into the combustion chamber. When this pressure, or compression, is too low or high, the chainsaw . 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. I would never put water in it! Yeah, I must have flooded it as I was working on it. 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. If it does maybe it is plugged. The manual for this model, and the parts breakdown, show a compression release valve. Runs well, except it. The Pulley compartment plays a massive role in retracting the ignition rope. Get you some Sea Foam at the local auto parts store. Free shipping. But it was stolen along with other tools around 1990. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. Remove the air filter cover and then slide off the rubber spark plug connector from the spark plug. after that I'd be looking at crank bearings. Compression is measured by using a simple screw-in gauge. It's an older saw I bought at a garage sale. You are misunderstanding WHY water is put into carboned up engines. 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?? A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. Any help out thereEGBinOR Get you some Sea Foam at the local auto parts store. The piston and rings are very shiney. Pull the rope until it starts. 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. Over time, soot from the engine clogs up the spark arrestor causing the chainsaw to stall. I would suspect the timing is too early. I wouldn't go messing with the carb expecting to cure the issue unless you have obvious signs of flooding when trying to start. In other words, the problem is in the trigger itself, not a. carb adjustment screw. Now, how much compression the engine of a chainsaw needs depends upon its motor capacity and temperature. If it does maybe it is plugged. Hold the tip of the blade and adjust the tension of the chain correctly. I've done it to high hour Kohler engines many times. You will notice the compression less. That is the nature of a 250. Most times, when the Stihl chainsaw stops working, it is never a complete breakdown. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. 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! As far as compression, you can usually tell by how the saw pulls when starting it. 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. When there is too much fuel, it will not ignite, and the engine wont start. Being new carb, wasn't looking that direction educate a non mechanic. i have a ms 250. Any chance is it hydro locking because of gas? Sometimes an adapter is needed to make a tight fit. If I drop start it I can pull it through 1 compression stroke. "dateModified": "2017-08-17", { When the oil pimp or oiler is faulty, it will reduce the chainsaws performance and power. Too much hot or cold engine does not work or even start to produce vacuum pressure inside engine. 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. Replaced the chain and did some serious cutting and was so pleased. In most cases, a buildup of carbon under the rings presses the rings against the cylinder, culminating in compression of the cylinder. Check for broken teeth on the chain and replace them if necessary. It is significantly tougher to pull over than an 024 or the new 241. Make sure the crank taper is clean and the flywheel taper also. I think that's what I'd do. The other reason might be the use of the wrong type of oil for the climate. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. 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 takes a Bosch WSR6F or NGK BPMR7A. Final step: removing the old spark plug and installing the new one. So, If you feel too much compression while pulling a chainsaw, the possible reasons might be as below. Welcome! The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. 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. Sometimes, the ignition rope is frayed or stuck inside the starter housing. If your chainsaws cylinder and piston have a lot of carbon build-up, it can cause the chainsaw to have high compression. Currently I live in Austin, United States. A flooded engine is when there is too much gas in the combustion chamber, usually due to repeatedly starting the chainsaw using the recoil system without the engine starting. It may not display this or other websites correctly. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Insert the air filter and the spark plug, reconnect the spark plug wire, and close the opening. Modern View Forum powered by phpBB 2001, 2005 phpBB Group. Every time you fuel the chainsaw, you should make sure to drain the old fuel first to avoid contaminating the new fuel. Any ideas? Don't know what to do at this point. Do that to the starter side when you're looking at the starter assy. Wipe off any dirt and debris and check for any signs of damages. I got it going. Too much carbon will do that, check the piston top and combustion chamber. 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. "name": "Egbinor" It's also possible the piston or cylinder are scored or carboned up. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. SPONSORED. Use a can of carb cleaner sprayed into the breather/filter assembly. You can prevent the new starter rope from fraying by burning the two ends of the rope. 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. 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. 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. Cleaned it all up, and had it tuned up. "mainEntityOfPage": { First, remove the cylinder and piston from the chainsaw. 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. "text": "My chainsaw has gotten very hard to pull the rope. Disconnect the spark plug from the engine and inspect if it is damaged, eroded, or dirty. Please use the navigational links to explore our website. If it is hard to pull, then check how the spring is performing. You can follow the steps on how to troubleshoot and revive it when it wont start. Yes I tried that last time and it did help some. It runs good after I get it started. Confirm the spark plug gap, check and adjust with a feeler gauge or gaping tool. Your chainsaws compressive strength is measured with the use of a screw-in gauge. Stihl 251 chainsaw. You will notice the compression less. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. Check the saws exterior for loose bolts, nuts, and screws and tighten them with an adjustable wrench or screwdriver. A cold engine will need the compression of 50-100 PSI whereas a hot engine will require compression above 150 PSI. Hello D beatty, Here is a link for two stroke engine air cycle, Guido. link to Winterize Your Pool Like a Pro: A Comprehensive Guide for Home owners. Although this is often true, it is not always the case. "@type": "WebPage", It prevents the carburetor from allowing too much fuel into the combustion chamber. Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. "@type": "Person", For the chainsaw to function appropriately, you must maintain the proper amount of tension on the chain. Carboned rings will decrease not increase compression. I pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. Don't know what to do at this point. Put a solder in the sparkplug hole, turn the flywheel until the piston touch the solder, then measure the solder. Make sure it's greased and the bushings are good. If you notice the treads are worn, which prevents the device from pumping, replace it with a new one. The saw feels good in my hands and its got a surprising amount of power. It runs good after I get it started. OEM GOOD USED STIHL 048AV CHAINSAW SHORT BLOCK ENGINE 120 PSI COMPRESSION. That model is extremely easy to flood. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", Would not be afraid to do it to a 4, 6, or V-8. When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. Activate the chain brake and then place the chainsaw on a flat, leveled surface. Are you sure the starter rope isn't a little too short? Why is the Garage Door Opener Light Not Working? in the, All Rights Reserved. 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. 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. Reddit and its partners use cookies and similar technologies to provide you with a better experience. And some will have more. runs way too fast. Create an account to follow your favorite communities and start taking part in conversations. Stihl MS192T Chainsaw Fuel Oil Tank Engine Housing Assembly OEM. I;ve read somewhere to put water? Fine adjust everything and both saws start Normal now. If there is any damage to the pulley at any stage, it will cause High Compression or stiffness during a pull.. "@type": "InteractionCounter", 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. Check the chainsaws fuel if you have not used the tool for a while. $20.00 shipping. I have a MS250 that has come up on compression since new. Take off the side cover, bar and chain and see if there is any play in the clutch side of the crank. 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. Make sure you have a replacement spark plug on hand in case the problem recurs in the future. }, Not sure it would accomplish anything on a 2-stroke chain saw engine. That is the nature of a 250. When starting, slowly pull the rope to where it pulls hard before starting your actual starting pull. 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. 1. saw has new carb 2. flywheel has been removed and key inspected. Obviously, the motor, which has a huge capacity, will require more compression. Choke cannot be used even when engine cold, or flooding occurs. 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. So be sure to keep your chainsaw properly maintained and avoid compression problems. Every chainsaw requires a different compression level according to its built-up and model number. The carburetor is a significant part of the chainsaw. Detailed, well-researched, and accurate home and garden information presented in an understandable format is our primary goal. (there is some play when flywheel on shaft (nut not attached) 3. tank and oiler vents are operating 4. exhaust has been removed and spark arresting screen checked (clean) 5. piston/walls checked.. no scarring Once it's removed, you can place a gauge on the place of the spark plug. Check the spark plug and replace it if needed. Can also be used with hedge trimmer attachment HS 246. That is what was told to me by the area distributor technician Check for side play in the crankshaft. Use an adjustable wrench to loosen the two nuts on both sides of the chainsaw. Start new topic; Recommended Posts. "image": { 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. The chain clutch might be, Read More Cordless Chainsaw Wont StartContinue, The most common reason is simply the wrong battery. I've done it to high hour Kohler engines many times. Pull the starter rope until you hear the first sign of it firing with a small burp. 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. When people did it years ago it was with 4 stroke engines where the water is flowing straight into the cylinder. The second thing, Read More Stihl Chainsaw Charger Not WorkingContinue, Your email address will not be published. #1. "headline":"Chainsaw has too much compression", 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 Stihl chainsaw uses a four-position lever ignition system called the master control lever. A drastic and frankly silly thing to do though . As stated it is with a hot engine so the water turns into steam in the cylinder and helps bust up the carbon. Register today and take advantage of membership benefits. 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. Hope this helps. 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. "interactionType": "https://schema.org/CommentAction", You are using an out of date browser. Wipe off lubricant and grime from the bar with a clean rag. The plug should be tight against your thumb. Try taking it out, Then holding the trigger while you pull fast. The other cause of your chainsaws high compression could be the stuck ignition rope. Sounds like it was broken in "right", show the guy how to start it and tell him to be happy. A drastic and frankly silly thing to do though . It's from not pulling hard enough.

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