My dad died 6 months ago and I have all of his tools and things he was working on at the house. Sad but true,you cant save em all. 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. 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. 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. 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. This measures the amount of pressure in the tool's cylinder. The pull was too short too.. New comments cannot be posted and votes cannot be cast. This is what I look for when repairing commercial equipment and older vintage saws or any 2 stroke engine. It took a lot of pulls to get started before I realised the carb was not factory set. I recently developed a leak in my primer bulb and took my chainsaw apart and replaced primer bulb, fuel lines, and cleaned the carburetor. Press J to jump to the feed. Source(s): https://owly.im/a85XD. First thing we check is compression by feel. If I can get this chainsaw working for him then I would be very happy. Remove the spark plug and it spins freely. 0 0. For a chainsaw that works around 50cc, the required compression is 140-150psi from the air compressor. The symptoms were identical to what you are describing. The chainsaw typically sits a year at a time and this year a tree came down and I needed the Husky quick. The most common reason is due to too many attempts trying to start the machine in the choke position. Too much compression. Hi I have a chainsaw which is a Mac Allister 40cc. Chainsaw compression. 358.360121 16" craftsman chainsaw I am looking for what the normal operating compression should be on this chainsaw. Too hot or too cold engine, will not ask an appropriate compression rate from inside of the engine. Diagnosing the Compression System. Honestly take it to a shop, they charge $15-$20 for a compression test and you know where you stand. Therefore ultimately, your engine will not produce the required compression inside of it. The bore should be nice and smooth. 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. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Read the article to know how much compression should a chainsaw have. Get shopping advice from experts, friends and the community! Hi I have a chainsaw which is a Mac Allister 40cc. Anonymous. The other chainsaw is an identical model and has similar problem. getting fuel,spark tried starting fluid in cylinder,new plug just get a little smoke from it. If I turn the saw upside down, I get a drop or two of fuel from the spark plug hole, not enough to lock up the cylinder. please advise I know a lot of chainsaws have the decompression valve to help start easier but this one doesn't I've checked everywhere. I bought 2 032 Stihl saws at auction that pulled very hard. The more you use a chainsaw, the quality of the fuel gets worse with time. just went through my parts manual for the Stihl 034 chainsaw and did not see a listing for a compression release or location. A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance tips. Next thing is to smell/look at fuel. Can you tell me where the release is located? Chainsaw . However, these moving parts, to stay moving, require a substantial amount of compression. This explosion and movement of the crankshaft causes the engine to come under a vacuum pressure, or compression. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. Any advice thanks I'm sure I can attach picture. Recently bought a Stihl MS250-18" chainsaw. Just had the saw running five minutes before this condition started so I'm thinking the flywheel key isn't broken. Too much compression on chainsaw. anything really high could be carbon buildup on … I need to check if I am hitting the end of the cord maybe it's too short? I did read that flooding it can have that effect. So don't skip arm day. He was good with this stuff, but I didn't have a clue about fixing things and never learned. Thread starter hemlock; Start date Mar 20, 2011; Forums. Dissapointed. A quick check is to pick the saw up by the recoil handle, if the saw drops thru the compression stroke, it needs serious work. Recently bought a Stihl MS250-18 chainsaw. 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. Jon. 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 … Bottom line is we need more info. Regular 87 octane is pretty much garbage. But if neither cylinder is at spec (remember, you gave us no numbers) it could be worn rings and compression is leaking. 2. I've tried pulling numerous times rapidly with the spark plug out to get rid of excess fuel and I've tried leaving it upside down to drain out of cylinder. Question I just bought an 075AV and it was delivered without a compression release. Main Hearth Forums. Mr P. Lv 4. If I take the spark plug out its easy and smooth, but if I put it in then it's hard to pull and I can't start it. I will typically cheat by giving it a rich start. When the starter feels tight, don't just assume that compression is the culprit. Having a hell-of-a-time starting...compression seems much too strong for the pull cord. According to Stihl USA, the minimum compression reading for their chainsaws should be around 110 psi. We have explained that later. 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. The only problem now is that when I try to start it theres a lot of compression and it very hard to pull. Remove the spark plug from your tool. After three times using it the start cord broke. 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. It has been stored in my garage w/o starting for approx 10 months. Having a hell-of-a-time starting...compression seems much too strong for the pull cord. But when I did it's first start it was so stiff with the plug in, that I need to use both hands and have my foot on top of the body. ... You may also have a dead or dying head gasket too, could cause low compression but many small motors have one piece cylinder/heads so this may not be an issue. Lawn equipment compression should fall in a range between 90 and 110 psi. ... in where a hot engine will ask more than 160psi compression range from the vacuum air. All went well with the build and it was a load of fun. He was good with this stuff, but I didn't have a clue about fixing things and never learned. I built a clone Stihl saw ms660. Excessive wear around the hole that the rope runs through will do the same. Press question mark to learn the rest of the keyboard shortcuts. If a saw has less than 100 from the outset then it likely will be very hard to start and flood out easily. Most 2 cycles need a minimum of 100psi to run, some will run with less, some won't. Reliability & Customer service. I've got a big ol' Jonsered 801, 80cc, no decompression valve, and it can be a beast for me to start sometimes. High compression is usually first diagnosed when the starter rope refuses to pull. Once started it runs great. It has been removed and the hole plugged. 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. Re: Chainsaw has too much compression in reply to vsteel, 08-18-2017 07:12:26 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. 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