The hose cracked and allowed air in, making the mixture too lean and causing me to need a new piston. 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. 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. 120 -145 psi is best. Most 2 cycles need a minimum of 100psi to run, some will run with less, some won't. I know a lot of chainsaws have the decompression valve to help start easier but this one doesn't I've checked everywhere. The bore should be nice and smooth. Chainsaw compression. I built a clone Stihl saw ms660. 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. Excessive wear around the hole that the rope runs through will do the same. The other chainsaw is an identical model and has similar problem. 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. When the starter feels tight, don't just assume that compression is the culprit. Running a lean mixture for too long will cause irreversible damage to the internals of the engine. Too hot or too cold engine, will not ask an appropriate compression rate from inside of the engine. Source(s): https://owly.im/a85XD. I've got a big ol' Jonsered 801, 80cc, no decompression valve, and it can be a beast for me to start sometimes. anything really high could be carbon buildup on … 5 years ago. You should maintain servicing the chainsaw every time after using it for 25 hours. Too much compression. Can you tell me where the release is located? The most common reason is due to too many attempts trying to start the machine in the choke position. Hi I have a chainsaw which is a Mac Allister 40cc. 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. Get shopping advice from experts, friends and the community! Having a hell-of-a-time starting...compression seems much too strong for the pull cord. It has been removed and the hole plugged. After three times using it … The Internet says to check cylinder and piston for carbon build up which I have and it looks fine, its all shiny with no scratches. To understand the compressor test of the chainsaw, there is a simple test that you can conduct. 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 am getting about 95 the chainsaw will not start. getting fuel,spark tried starting fluid in cylinder,new plug just get a little smoke from it. 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. Hi I have a chainsaw which is a Mac Allister 40cc. Yes, I used it pushed in between each stroke it still takes a hell of a pull. A chainsaw engine generates this compression through the explosion of the fuel in the combustion chamber and the movement of the crankcase. However, these moving parts, to stay moving, require a substantial amount of compression. My dad died 6 months ago and I have all of his tools and things he was working on at the house. 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 … 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. 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. Recently bought a Stihl MS250-18 chainsaw. This explosion and movement of the crankshaft causes the engine to come under a vacuum pressure, or compression. 0 1. He was good with this stuff, but I didn't have a clue about fixing things and never learned. r/Chainsaw: A reddit for all operators of chainsaws to post experience with tools, pictures of their new saws and old workhorses and any maintenance … Press J to jump to the feed. ... 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. ... in where a hot engine will ask more than 160psi compression range from the vacuum air. If I force it and pull it hard it nearly rips my hand off. Therefore ultimately, your engine will not produce the required compression inside of it. 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 have a husky 288xp that is exactly the same . Having a hell-of-a-time starting...compression seems much too strong for the pull cord. Question I just bought an 075AV and it was delivered without a compression release. F-250 5.4 V8 stand. and also, should it be checked with the throttle open or closed? Lawn equipment compression should fall in a range between 90 and 110 psi. According to Stihl USA, the minimum compression reading for their chainsaws should be around 110 psi. 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. 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. In case you go higher cc motor such as 60cc, you might need compression of 160cc from the air compressor. It was very difficult to turn over with the compression release. Sad but true,you cant save em all. Thread starter hemlock; Start date Mar 20, 2011; Forums. 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 did read that flooding it can have that effect. Press question mark to learn the rest of the keyboard shortcuts. The plastic inserts really don't do much other than take up space & thus bump up secondary compression. 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. He was good with this stuff, but I didn't have a clue about fixing things and never learned. Just had the saw running five minutes before this condition started so I'm thinking the flywheel key isn't broken. However, I cant pull the starter cord at all now. First thing we check is compression by feel. I need to check if I am hitting the end of the cord maybe it's too short? For a chainsaw that works around 50cc, the required compression is 140-150psi from the air compressor. please advise Honestly take it to a shop, they charge $15-$20 for a compression test and you know where you stand. 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. So don't skip arm day. I recently developed a leak in my primer bulb and took my chainsaw apart and replaced primer bulb, fuel lines, and cleaned the carburetor. Any advice thanks I'm sure I can attach picture. The symptoms were identical to what you are describing. 1. 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. The more you use a chainsaw, the quality of the fuel gets worse with time. Next thing is to smell/look at fuel. so my thoughts is the compression is low. 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. Read the article to know how much compression should a chainsaw have. Stihl Chainsaw Compression. 0 0. The starting action prior to this had been fairly smooth when pull starting the rope. Too much compression on chainsaw. High compression is usually first diagnosed when the starter rope refuses to pull. It has been stored in my garage w/o starting for approx 10 months. Press J to jump to the feed. Jon. After three times using it the start cord broke. I have a Homelite 20" 2-cycle chainsaw that's 2 years old with about 2 hrs run time from new. Press question mark to learn the rest of the keyboard shortcuts The chainsaw typically sits a year at a time and this year a tree came down and I needed the Husky quick. We use cookies to give you the best possible experience on our website. 358.360121 16" craftsman chainsaw I am looking for what the normal operating compression should be on this chainsaw. Remove the spark plug and it spins freely. Reliability & Customer service. 2. If a saw has less than 100 from the outset then it likely will be very hard to start and flood out easily. The only problem now is that when I try to start it theres a lot of compression and it very hard to pull. Once started it runs great. He always had something to do or fix and would always get round to doing it. If both the spark test and the fuel test fail, you will need to try a compression test. But if neither cylinder is at spec (remember, you gave us no numbers) it could be worn rings and compression is leaking. Compression is generated by the engine via the crankcase and the combustion chamber. I will typically cheat by giving it a rich start. Diagnosing the Compression System. Remove the spark plug. 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. Chainsaw . Will this get easier or have I done something dumb? cab, tandem trailer Ferris IS3100Z 61" L … My dad died 6 months ago and I have all of his tools and things he was working on at the house. I did this yesterday and got it started once and it ran for a few seconds. This is what I look for when repairing commercial equipment and older vintage saws or any 2 stroke engine. The pull was too short too.. New comments cannot be posted and votes cannot be cast. Main Hearth Forums. I did not take it apart , but concluded rust must have formed on the cylinder even stored inside as … Hey thanks much, the comments section filled in the blanks too, like whats the bare minimum of compression needed before an engine will start, and that's 75psi – 90 is a worn out engine. Remove the spark plug from your tool. I have removed the muffler and cleaned it and still nothing. For a fast and easy start of the chainsaw, try to use fresh fuel. I bought 2 032 Stihl saws at auction that pulled very hard. Try to use or at least run your chainsaw on a regular basis just to keep all its parts active. to much compression on chainsaw? He always had something to do or fix and would always get round to doing it. We have explained that later. A worn cam would also give you a higher reading. Recently bought a Stihl MS250-18" chainsaw. Pull the muffler, get the piston below the exhaust ports, shin a bright light into the port and look/see. Regular 87 octane is pretty much garbage. just went through my parts manual for the Stihl 034 chainsaw and did not see a listing for a compression release or location. I have a spare sprocket that I am using and have learned now not to force it if it won't pull smoothly. February 22, 2011. 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. Anonymous. All went well with the build and it was a load of fun. 1 decade ago. Mr P. Lv 4. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Stihl reviews (www.stihl.com): Can’t start chainsaw. I had a problem at first with the pull rope which wouldn't budge but I sorted it and it work now. More than likely it's just a high compression big displacement saw, it's gonna be difficult to 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. It took a lot of pulls to get started before I realised the carb was not factory set. 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. But after all of that pulling and forcing the teeth on the sprocket which are plastic wore down, so much that they don't protrude enough to catch the fly wheel. Bottom line is we need more info. 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. This measures the amount of pressure in the tool's cylinder. If I can get this chainsaw working for him then I would be very happy. 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. 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. Dissapointed.
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