let it idle over lunch, just made sure to not go too long between filling it with gas, while running of course. "name": "Yesterday's Tractor Co.", To inspect the guide bar, disassemble the chain cover, chain and bar. It runs good after I get it started. }, As far as compression, you can usually tell by how the saw pulls when starting it. I used to have a Homelite that would do that if I left gas in it. Just wondering what your opinions are of the lowest compression you can run a Stihl MS250 at. If it is too damaged, you should replace it. (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 Then Google "decarb". what and or where is the metering lever.? Subsequent starts are just as hard. Would not be afraid to do it to a 4, 6, or V-8. Create an account to follow your favorite communities and start taking part in conversations. Over time or when using the wrong fuel, the fuel filter becomes too clogged and restricts fuel flow, killing the engine shortly after starting. Wipe off any dirt and debris and check for any signs of damages. JavaScript is disabled. To fix this problem, turn off the chain saw and let it sit for about 30 minutes to allow the excess gas to evaporate. Unscrew the clutch assembly on top of the oil pump. It takes a Bosch WSR6F or NGK BPMR7A. Admitted Woodaholic. If it does maybe it is plugged. Pull trigger and set full choke. 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. Chainsaws are very powerful tools, and if theyre not properly maintained, they can easily overcompress the chain, which can cause it to break. 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. Would have to remove spark plug and rinse cylinder with gas to be able to start. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Yes I tried that last time and it did help some. The Stihl 066 chainsaw uses the same type of engine most gasoline-powered yard tools use, a two-cycle combustion 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. It uncoils, tightens the spring, engages the clutch to start the engine. Any chance is it hydro locking because of gas? In this case fixing or repairing is required or worst replacing the engine all at once. Afterward, the beginning rope is pulled repeatedly until the gauge comes to a full stop on its own. 3 9 9 comments Best Add a Comment Revolutionary-Act469 2 yr. ago Doesn't pull at all or just hard to pull. A lot of variables might contribute to excessive compression while using a chainsaw. Pour starting fluid into the carburetor and crank the engine several times. 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. link to Indoor Fly Traps: 5 Things You Didn't Know About Indoor Fly Traps. Getting these problems resolved is a rather straightforward process. On a 2 stroke the water would go into the crank case first and pool up. I would never put water in it! Now, how much compression the engine of a chainsaw needs depends upon its motor capacity and temperature. 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. Your email address will not be published. Make sure the keyway is lined up correctly and tighten the nut down good and tight. What are the numbers on your sparkplug? Get you some Sea Foam at the local auto parts store. The early 064, 044, 066 came with a red master control. Press J to jump to the feed. More information can be found on this page. 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. Also check the air filters and make sure they are clean. Remove the air filter, wash it with detergent and water and scrub off the dirt with a brush. It was easier to pull after I cleaned it up, but still tough. That is the nature of a 250. It's also possible the piston or cylinder are scored or carboned up. If it does maybe it is plugged. You need to pull the exhaust to check that. 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. Versions MS 260, Bar length 37cm, RSC Press question mark to learn the rest of the keyboard shortcuts. Fuel filters trap dirt and contaminants from the fuel to prevent them from damaging the engine. Hello. Dont substitute it with. If it is not physically damaged, clean it with clean gasoline and a rag. Register today and take advantage of membership benefits. I;ve read somewhere to put water? I've got four other Stihl saws here, an 029, 036Pro, 015L, and an MS200T, only the 36Pro pulls this hard and only if I don't use the decomp button. You are using an out of date browser. Thus far, you have learned how to diagnose most problems with the Stihl chainsaw and how to fix the issues. Finally the fuel will be converted into energy. To test the recoil starter, remove it and reposition the spring. You will notice the compression less. If the chainsaw is too little compression, it may start easily but will not run smoothly. Also check the air filters and make sure they are clean. 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. Unscrew the spark plug wrench using a spark plug from the engine. If oil is in there it is what makes the engine feel like it is almost locked up. Also take the spark plug out and do the same. Would not be afraid to do it to a 4, 6, or V-8. 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. Most of the time, the chainsaw cord became hard to pull because of the Starter Housing. A large engine has a huge capacity in its motor. A clear sign that you may have a chainsaw engine is when you smell gas while starting it. 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. Try it, it may just do the trick! Don't put water into the 2 stroke. Manual for my Stihl saws and leaf blower says to scrape carbon out of the exhaust port. I got it started. Move the selector lever up one position immediately or the saw will flood on the very next pull. "@id": "https://www.yesterdaystractors.com/" Loosen the nuts and bolts clockwise and then pull out the oil pump gently. 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. Try it, it may just do the trick! We and our partners use cookies to Store and/or access information on a device. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. The starter assembly often fails to rotate due to a weak connection between the pulley and the ignition rope. This is bad practice, and can damage your chainsaw. 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. 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. Recognised as a leading saw in the forestry industry, it is available in guide bar lengths 13"/32cm to 18"/45cm. But it was stolen along with other tools around 1990. Make sure you have a replacement spark plug on hand in case the problem recurs in the future. 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. If the air filter is too clogged, you should replace it. Being in the cutting services for more than 10 years, I know a thing or two about chainsaw. Don't know what to do at this point. Soaking in water will do nothing but rust things up . A problem in the ignition system is likely to be the culprit when the chainsaw doesnt spark. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . Doesnt pull at all or just hard to pull. However, the compression also has a limitation because a very high or very low compression will cause problems and prevent your chainsaw from operating efficiently. 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. For 503552201 Cylinder Compression Plug Package Include: 3 x Cylinder Plug Cylinder Compression Plug "dateModified": "2017-08-17", Quoting Removed, click Modern View to see What?? 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. Blup throttle to bring it down to idle. Save my name, email, and website in this browser for the next time I comment. Ok folks, I'm stumped. 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. Uninstall the spark arrestor and unblock it using a brush, but you can also replace it for efficiency. If that is true, I'd suspect that the timing is off and why it's ripping the cord from your hand. If not I'm honestly kinda stumped. Continue with Recommended Cookies. I have plenty of engines with REALLY low compression that I'll be glad to swap him. A 250 is a joy to pull start Compared to my 200+ compression ported saws with no decomp. 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. If it is hard to pull, then check how the spring is performing. The power of the motor of an engine is measured in its capacity. Back to top derwen1959 Long Time User anthonyg_ma Original Author 16 years ago Canguy, thnks for the tips! Does the saw have a compression release? We're all about fixing small engines, from carburetor rebuilds, to crankshaft machining.