I have a MS250 that has come up on compression since new. Sometimes the spring stops working correctly due to overuse and becomes brittle. You are using an out of date browser. Additionally, most spark plugs come pre-gapped. 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. 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 pulled them over with plug out ,They seemed to pull normal and believe they were fuel locked. "headline":"Chainsaw has too much compression", 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 If the reading is below or above the required range, then your ignition coil requires changing. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Continue with Recommended Cookies. Wear rubber gloves and hold the rubber plug and spark plug about 1-2cm from the metal surface of the engine unit. after that I'd be looking at crank bearings. You can check the compression by pulling the spark plug out and holding it in your hand. Final step: removing the old spark plug and installing the new one. Thanks! A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips. The following have been addressed. A faulty spark plug will have carbon, dirt, and oil blocking the insulator nose, preventing it from firing consistently. If it is the right sparkplug and not flooded, I would maybe buy a different saw with easy start. I bought it used around 1978. Can also be used with hedge trimmer attachment HS 246. Your chainsaws compressive strength is measured with the use of a screw-in gauge. Use of this Web site constitutes acceptance of our. My name is Chris Ross. "mainEntityOfPage": { If you buy another battery, make sure it has the same voltage and amperage as the old battery. A 50CC engine needs 150 PSI compression. My question is what is causing the trigger to not slow down. "interactionStatistic": { When the fuel starts to turn stale, it gums up and clogs the carburetor just as it would in an unused lawnmower. Several reasons can cause your Stihl chainsaw to bog down when your pull the trigger. Being new carb, wasn't looking that direction educate a non mechanic. The purpose of a choke in a chainsaw is to make cold starting more effortless, but if you do not use it properly. I was given (estate) a small McCulloch chain saw and it started and ran great. Could be the main bearings are loose, look for evidence of the coil rubbing the flywheel. 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. Don't put water into the 2 stroke. If this is the case, you may want to try lubricating the rope to see if it would assist to resolve the difficulties. "interactionType": "https://schema.org/CommentAction", Then Google "decarb". This may sometimes jam your chainsaws rings, causing it to become inoperable. "width": 200, To ensure correct functioning and to prevent excessive compression, you might have to repair worn-out parts with new ones. Press question mark to learn the rest of the keyboard shortcuts. In this case fixing or repairing is required or worst replacing the engine all at once. in the. All it needs is a few inches missing and it will pull too hard like the compression is too high. Check for side play in the crankshaft. First, remove the spark plug from the chainsaw. It's supposed to warm up later this week so I'll be able to do some more on this chain saw. Maybe the piston is hitting it. Pull the starter rope until you hear the first sign of it firing with a small burp. Are you sure the starter rope isn't a little too short? As a result, normal compression settings will change based on the kind of chainsaw machine you are using. So, replacing the ignition rope is a better option to keep everything working smoothly without any damage. Choke cannot be used even when engine cold, or flooding occurs. Normally it's not a problem but if it was already difficult to pull it could be. Wipe off any dirt and debris and check for any signs of damages. What is the minimum compression for my STIHL chainsaw? Stihl recommends using 89 octane gasoline without ethanol, and the gas should not contain more than 10% ethanol. Greenworks Commercial GS181 82V 18-inch Chainsaw: 50cc gas equivalent power with a stock 18-inch bar and chain ( starting at $349) 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 hook up a drill to the nut on the clutch and start hard starting saws that way . pulls with little resistance, similar to my farm boss. This compression converts fuel (any source) into the potential energy in the engine to start it. You have an option to either pull off the starter and clean it or look for an ideal replacement for your starter house. 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. High compression in chainsaws is a dangerous problem that can lead to serious injuries. We describe all the possible issues and also suggest the solutions to fix them too. It uncoils, tightens the spring, engages the clutch to start the engine. When it comes to compression values, those between 90 and 110 psi are deemed to be acceptable. All it needs is a few inches missing and it will pull too hard like the compression is too high. 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. I have a MS250 that has come up on compression since new. Remove the spark plug with a spark plug wrench and clean it with a brush to remove carbon scoring and dirt. I'll even do the labor for free. 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. } We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. An excessive amount of compression in your chainsaws starting rope could also be indicated by the beginning rope failing to draw. "userInteractionCount": 23 Carboned rings will decrease not increase compression. The ignition coil transmits electricity to the spark plug to create a spark that ignites the engine. Do that to the starter side when you're looking at the starter assy. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. Insufficient fuel in the system may result in excessive compression. $49.99. When the motor warms up after about a minute, turn on the choke position. The second thing, Read More Stihl Chainsaw Charger Not WorkingContinue, Your email address will not be published. The carburetor sucks fuel from the tank, mixes it with the right amount of air, and pushes the mixture into the combustion chamber. Small Engine Technician The saw feels good in my hands and its got a surprising amount of power. Unscrew the spark plug using a ratchet and screw the compression gauge in its place. "height": 57 If it does maybe it is plugged. If you are trying to start your chainsaw in winter and the oil you used for the chainsaw assembly is not suitable for the winter season, you also feel high compression. Stihl 291 chainsaw too much compression Check the compression of the engine. Find the low speed, high speed, and idle speed screws near the carburetor, start the engine and allow it to warm up. I can probably find one with at most 65 PSI. 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. }, SPONSORED. Carboned rings will decrease not increase compression. Keep in mind that the stuck ignition rope can also damaged other parts inside the starter assembly. Sounds like it was broken in "right", show the guy how to start it and tell him to be happy. Remove ignition coil and muffler. It has barley been used, no carbon in muffler, still happens with muffler off, does not happen with sparkplug out. #3. Make sure it is snug but can also move freely by hand. Would not be afraid to do it to a 4, 6, or V-8. What usually happens is that the guide bar gets stuck in the tree and they keep running the engine while trying to force the bar out of the tree somehow. The Housing is the outer cover of the starter, and if it is damaged, your chainsaw suffers stiffness during a pull. I would never put water in it! You need to pull the exhaust to check that. However, if I push downward on the trigger button, it slows down to. }. 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. You will notice the compression less. What worked with my MS440 kicking problem should also work with that one. More information can be found on this page. It is possible however to flood a two stroke which can cause the plug to fowl. If oil is in there it is what makes the engine feel like it is almost locked up. Stihl chainsaw compression test Joe_Power Jun 2, 2015 Not open for further replies. Usually, this happens when you use a chainsaw after a very long time or by wear and tear of the rope. Thank you for the responses. That is what was told to me by the area distributor technician. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. If the issue persists after the addition of new fuel to the tank, there may be a fault with the gas pipelines or the fuel filters. Create an account to follow your favorite communities and start taking part in conversations. When you start your chainsaw, the crankshaft spins, creating vacuum pressure on the carburetor, pulling the gas from the tank and into the combustion chamber where it mixes with air and ignites. "image": { To fix this problem, turn off the chain saw and let it sit for about 30 minutes to allow the excess gas to evaporate. 4 Possible Problems & Solutions Problem 1: Damaged starter housing Solution: 1. 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! Ok folks, I'm stumped. Maybe take the plug out & pull the cord several times to blow out any excess fuel, then see how it pulls. Check the chainsaws fuel if you have not used the tool for a while. "@type": "Person", Press question mark to learn the rest of the keyboard shortcuts. Consequently, operating this chainsaw becomes a really difficult chore to do. 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. For 503552201 Cylinder Compression Plug Package Include: 3 x Cylinder Plug Cylinder Compression Plug On a 2 stroke the water would go into the crank case first and pool up. Tighten the tension screw with a screwdriver to tighten the chain around the bar.
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