Hi I have a chainsaw which is a Mac Allister 40cc. Press question mark to learn the rest of the keyboard shortcuts First thing we check is compression by feel. Once started it runs great. Chainsaw . Chainsaw compression. Having a hell-of-a-time starting...compression seems much too strong for the pull cord. Remove the spark plug and it spins freely. If a saw has less than 100 from the outset then it likely will be very hard to start and flood out easily. Chainsaw Compression Release Explanations of the purpose and value of a compression release valve on a chainsaw, and some advice on starting a stubborn saw with less pull-back on the rope. Press question mark to learn the rest of the keyboard shortcuts. Running a lean mixture for too long will cause irreversible damage to the internals of the engine. The hose cracked and allowed air in, making the mixture too lean and causing me to need a new piston. F-250 5.4 V8 stand. Stihl Chainsaw Compression. 0 1. The rich gas load keeps it from firing so hard that it stops me dead in the stroke, but still has just enough pop to start it, and it isn't flooded to death. Thread starter hemlock; Start date Mar 20, 2011; Forums. Will this get easier or have I done something dumb? The starting action prior to this had been fairly smooth when pull starting the rope. Diagnosing the Compression System. After three times using it the start cord broke. Too much compression on chainsaw. I have a Homelite 20" 2-cycle chainsaw that's 2 years old with about 2 hrs run time from new. Compression is generated by the engine via the crankcase and the combustion chamber. Having a hell-of-a-time starting...compression seems much too strong for the pull cord. cab, tandem trailer Ferris IS3100Z 61" L … I know a lot of chainsaws have the decompression valve to help start easier but this one doesn't I've checked everywhere. Anonymous. The other chainsaw is an identical model and has similar problem. Stihl chain saw too much compression I had to take it apart to put in new crank seals so I had to split crank case - Answered by a verified Technician. Thanks I'll check the pull cord length this week as it's honestly like it's jamming or bottoming out and flying out of my hand. 358.360121 16" craftsman chainsaw I am looking for what the normal operating compression should be on this chainsaw. I had a problem at first with the pull rope which wouldn't budge but I sorted it and it work now. On some saws I have found excessive wear in the pull start that allowed the pulley to twist a bit sideways and that makes it difficult to pull. I bought 2 032 Stihl saws at auction that pulled very hard. to much compression on chainsaw? I did this yesterday and got it started once and it ran for a few seconds. A bad fuel line will cause the chainsaw to run lean (too little fuel or too much air in the mixture), and this means it will only run at idle for 5 to 10 seconds before it shuts off completely. i am getting about 95 the chainsaw will not start. A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips. However, I cant pull the starter cord at all now. The most common reason is due to too many attempts trying to start the machine in the choke position. Bottom line is we need more info. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. getting fuel,spark tried starting fluid in cylinder,new plug just get a little smoke from it. I did read that flooding it can have that effect. More than likely it's just a high compression big displacement saw, it's gonna be difficult to start. When starting a unit, make sure to follow the starting instructions in your instruction manual.The manual provides the proper instruction for starting procedures, but there are many conditions that may affect how the unit starts. Re: Chainsaw has too much compression in reply to Russ from MN, 08-17-2017 21:23:47 Also check the air filters and make sure they are clean. He always had something to do or fix and would always get round to doing it. Recently bought a Stihl MS250-18" chainsaw. anything really high could be carbon buildup on … But, just for the sake of an answer, a exhaust valve could be stuck and raising the compression or like one mentioned, carbom build-up. I have a husky 288xp that is exactly the same . I recently developed a leak in my primer bulb and took my chainsaw apart and replaced primer bulb, fuel lines, and cleaned the carburetor. 2. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. just went through my parts manual for the Stihl 034 chainsaw and did not see a listing for a compression release or location. For a fast and easy start of the chainsaw, try to use fresh fuel. If I can get this chainsaw working for him then I would be very happy. When compression is too low, you may experience decreased power or complete shutdown because the engine isn’t able to hold enough pressure in the cylinder to run efficiently. My small Stihl chainsaw has to much compression, it used to be ok and used to run well before I put it away in a … I'll set it choked, pull the starter fast a couple times with the ignition off, then pull it over real slow until the piston is just past the top of the stroke to give me as much momentum as I can get, then switch the ignition on and pull hard. Too hot or too cold engine, will not ask an appropriate compression rate from inside of the engine. so my thoughts is the compression is low. Yes, I used it pushed in between each stroke it still takes a hell of a pull. The only problem now is that when I try to start it theres a lot of compression and it very hard to pull. It has been stored in my garage w/o starting for approx 10 months. With the plug removed it should extremely easy to pull, if it is not my first guess is the clylinder is scoured up and/or bad bearing (s)/bushing. Get shopping advice from experts, friends and the community! I need to check if I am hitting the end of the cord maybe it's too short? Recently I tried to use it, but when I pull the starter rope, it feels like there is great resistance with every cycle of the piston, like there is too much compression. This measures the amount of pressure in the tool's cylinder. Mr P. Lv 4. I've got a big ol' Jonsered 801, 80cc, no decompression valve, and it can be a beast for me to start sometimes. Under reduced compression on a good tight saw the comp is still over 120 lbs, with the comp release closed it should be 140 or over. and also, should it be checked with the throttle open or closed? Can you tell me where the release is located? When the starter feels tight, don't just assume that compression is the culprit. Hi I have a chainsaw which is a Mac Allister 40cc. Question I just bought an 075AV and it was delivered without a compression release. Lawn equipment compression should fall in a range between 90 and 110 psi. I've bought some needed parts for this chainsaw which include a spark plug, air filter, a fly wheel and key and the body cover. It took a lot of pulls to get started before I realised the carb was not factory set. The chainsaw typically sits a year at a time and this year a tree came down and I needed the Husky quick. It has been removed and the hole plugged. Excessive wear around the hole that the rope runs through will do the same. The pull was too short too.. New comments cannot be posted and votes cannot be cast. For a chainsaw that works around 50cc, the required compression is 140-150psi from the air compressor. My dad got given this chainsaw as well as another one a while ago and since he has died I've been having a go at DIY and trying to fix things as he would of. The bore should be nice and smooth. Can barely pull starter rope ... as for "how stiff is stiff" - it is so stiff that I effectively can't start the saw - it is simply too jerkey and requires too much brute/uncontrolled force on my part to overcome the resistance. Try to use or at least run your chainsaw on a regular basis just to keep all its parts active. Therefore ultimately, your engine will not produce the required compression inside of it. Honestly take it to a shop, they charge $15-$20 for a compression test and you know where you stand. Source(s): https://owly.im/a85XD. We use cookies to give you the best possible experience on our website. The symptoms were identical to what you are describing. My dad died 6 months ago and I have all of his tools and things he was working on at the house. But if neither cylinder is at spec (remember, you gave us no numbers) it could be worn rings and compression is leaking.
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