Just wanted to thank you for taking the time to post these videos. I filled your instructions, iPad to my side and now have a saw in perfect running condition - and learned a ton along the way. You know what you are doing - thanks again.
Damn, your videos are amazing. I know how much work goes into shooting a video like that. Very time consuming. It looks smooth and flawless but it takes patience. Thank you for taking the time to make your videos and for making them so high quality. I'm learning a lot from you.
Thanks for the video, it helped me disassemble an MS 251 that was nearly impossible to start, due to extremely high compression. Put on new piston rings and am now able to pull the starter rope without causing a hernia! Thanks again!
Thanks for sharing DB. I left fuel in my ms 250. Rebuilt the carb still nothing. Replaced carb, still nothing. Now gonna replace the fuel line. The exhaust is clean, the ignition system is good. This teardown video is a great help. Thanks again.
Thank you, your videos are well thought out and in depth. The detail is enough to give most of us the procedures needed to do our own work in a timely fashion. I used to write instruction manuals but these videos are very helpful.
Your teardown showed the correct position of the "leaf spring" above the plastic off/run/half choke/full choke selector switch. The MS250 have a known issue where it can't be switched off, due to the carb cover being removed without moving the selector down to full choke position before removing the cover. The spring pops down below the selector switch where it doesn't belong, and creates a mystery on why the saw can't be switched off/keeps running. Thank you!
Nice demo Thanks! I just did the piston, rings and cylinder on my MS250. I didn't have a small ring compressor so I cut the end off a plastic tube of caulking and made my own ring compressor for the tiny piston.
Good news. Thank you. I've narrowed it down to either the Echo CS-400 or the Stihl MS 250. I've seen the Echo in store and I'll be looking at the MS 250 tomorrow. I'll have one by the end of the day tomorrow :)
Thanks for the vids, after watching this it gave me the confidence to strip down a MS180 to replace the cylinder and piston, quite a similar procedure to this saw just a few small differences. Great work keep the vids coming.
Hi Donyboy73. I just got a "second hand non-working MS250" as a hobby project. I disassembled it and it had the exact same broken parts as yours and the defects even looked the same: Piston was partly melted ned the edges, cylinder was scratched near the exhause, one ring was broken, one ring was stuck, ball bearing was missing one ball and the whole metal "ring" holding all the steel balls. So ... now it's time to order some new parts!
just wanted to say thanks... i had trouble geting the clutch off ....i wasnt shure if it was a left thread or not and i was a afraid to damage the part. seeing as how i disassembled the cluth as the very last step instead as one of the first.
Love your videos, I have a stihl MS250 C with a cracked fuel tank, is it possible to use an MS250 chassis to replace it and modify it to fit the MS250C chain adjustment system and ignition coil
Thanks for all you great videos. I finally got around to fixing my Stihl 026 after watching carefully your videos and Q&A videos. I pulled the cylindar off and see one of the rings is frozen and the piston and cylindar is scared on the back side. I will get a new cylinder and piston. When parts looking I see 44 MM bore and 44.7 MM bore. is there a way I can tell on mine which bore I have so I am sure to order the right part? Thanks agian for all your effort.
Very good , you do well.. I also own a MS-250 myself and really like it ... It appears i see metal transfer , like it's been run without mix oil in the fuel ... How does the jug look inside ? good job..
Hi Don, any advice on removing the plastic separator (translucent white) between the cylinder head and the sprak plug/carburetor? I need to get it off to replace the ignition coil HT lead and am out of ideas.
You do excellent work. I enjoy all of your videos and have learned a lot by watching them. I rebuilt my Sthil 041 and used this video as a guide even though they are different saws. I now have good spark, new carburetor kit, it's getting fuel, new spark plug, good compression with a new piston and cylinder, but the saw will not start. Can you give me any ideas what I should look at next? I would really appreciate your advice!
You are awesome. Videos are so thorough. My ms 240's flywheel broke. The little alignment spline snapped off because the flywheel was hitting the ignition coil. Do I need a new coil or is there an adjustment I can make? Thanks for the videos.
thank you....was not sure...I could see a big problem if the spring fell out while rebuilding....would wreak havoc,so I will make sure they are in the rubber before bolting cylinder on...
I got one of these saws for free (a neighbor was giving it away). He gave it away for a reason. Found your videos and took the saw apart to find that the piston head had a hole blown through it and was really deformed. Looks like he had no oil in the fuel-the cylinder looks burned, not shiny. Everything else looks great on the saw. Two questions: I tried tapping the flywheel off as you show, but no luck. What's the trick? And where do you order a replacement piston head and cylinder? Thanks.
i hae a stihl ms 290 i just aquired in horrible condition. i cleaned it out completely. replaced spark plug, the whole 9 yards. after many pulls of the cord it started at very high idle and rpm i might add. but now today it is jerky to pull cord. what could be the problem. i took off spark plug and tried to pull, easy as pie, install it back in, again jerk jerk jerk (end of rope).... any advice. i am lost
I have a problem with my ms250. Clutch needle bearings failed and heat melted the housing and oil pump. Can you do a video on disassembly and repair? Thanks!
my stihl MS180 turns over and works fine but when i try to turn it off it won't turn off at the "0" position I have to put the lever down to cold start position to shut it off. What is wrong with it and how do I fix it?
how bad does the cylinder need to be before replacing....have a scored piston ,with stuck rings on the exhaust side...cylinder has some markings that a think I can clean up....
i have an older 066 still 135lb compression new crank seals sperkplug .It will run for about 30 seconds but sounds like the brake is on labouring.what could be wrong
Im looking for help please i have ms 250 replace carburetor pump all par new from sthill start but don stay on the coil spark and i dont know what i need to do all parts new lines carb pump oil filter and i can't get it going please help me gracias
Re viewed about 1/2 dozen video on the process for removing the shroud. Your video is the only presentation that takes the time to explain the process. The rest are garbage. Thank you. Despite being more than 10 years old, an outstanding video, still relevant and useful.
I have a MS180C that refuses to start. Ran for a while with old gas then it just died. Tried new gas, new carb fuel line. Looked at the cylinder from the exhaust side and the top looks like a piece is cracked off or just disintegrated. How hard it is to replace just the cylinder/rings? How do you compress the rings to insert into the casing.
Merci don!! Jai ma compagnie depuis novembre 2011 et je repare aussi des petits moteurs!! Tu m as aider a plusieurs reprises!! Si jammais je passe dans ton coin jte paye une couple de bieres cest sur!!!
I have an MS250. Is it possible to remove and replace the intake boot with out pulling the cylinder? Does the white plastic plate have it captured is there a clamp holding the boot to the cylinder? Great Videos by the way. After I'm done with the chainsaw I plan on tackling my pressure washer.
Maybe he turned the "High" adjusting screw too far in (clockwise/lean). which would make it run hot. Or maybe he didn't warm it up a bit before putting it to work. The shutter may have been set for "winter", and he forgot to set the shutter for "summer"when the season changed, which would probably make it run too hot. Or maybe bad oil to gas ratio?
Nice video, but The wires related to the ignition circuit can be taken off at the top end, They have modular connectors just pop out. Don't have to take off the induction coil.
donyboy73 i have a chainsaw it doenst start i put a new carburetor ,new fuel lines,new spark plug,new air filter and still doesn't start what is the problem can you help me with this problem.thank you
I have a Stihl MS-250 chainsaw, and it have been down and in the shop more than it has been used in work. Instead, I have had to depend on my old Poulin chainsaw which I have had since 2000. I just got both saws out of the shop and the the Stihl is back to doing what it did since I had it, not cranking. The Poulin will start and works fine for me.
cost me about $450 to repair an 036 Pro in the Stihl shop and then I fried a piston after 4 gallons of gas, don't know if it is related or not. I did replace oiler, rings and some other stuff while it was apart
So my ms 250 will start, but will not run, only runs when i keep the throttle pressed down to keep it running, once i let go of the throttle the chainsaw dies, what would the problem be?
+Eric Kanakakeesic I have an ms 250 that was behaving similarly, and flooding very easily too, and it was caused by a malfunctioning fuel tank. It would start up and run fine if I remove the plastic cap on the fuel tank vent next to the carburetor
Just wanted to thank you for taking the time to post these videos. I filled your instructions, iPad to my side and now have a saw in perfect running condition - and learned a ton along the way. You know what you are doing - thanks again.
I just did a "Stihl chainsaw teardown" search. I'm so lucky that this just happens to be the same model as my saw. Thanks so much!
Damn, your videos are amazing. I know how much work goes into shooting a video like that. Very time consuming. It looks smooth and flawless but it takes patience. Thank you for taking the time to make your videos and for making them so high quality. I'm learning a lot from you.
InstaBlaster...
Thanks for the video, it helped me disassemble an MS 251 that was nearly impossible to start, due to extremely high compression. Put on new piston rings and am now able to pull the starter rope without causing a hernia! Thanks again!
Thanks for sharing DB. I left fuel in my ms 250. Rebuilt the carb still nothing. Replaced carb, still nothing. Now gonna replace the fuel line. The exhaust is clean, the ignition system is good. This teardown video is a great help. Thanks again.
Thank you, your videos are well thought out and in depth. The detail is enough to give most of us the procedures needed to do our own work in a timely fashion. I used to write instruction manuals but these videos are very helpful.
@kveldeal you can use a special flywheel puller or hit the shaft with the nut at the end with a brass punch
Your teardown showed the correct position of the "leaf spring" above the plastic off/run/half choke/full choke selector switch. The MS250 have a known issue where it can't be switched off, due to the carb cover being removed without moving the selector down to full choke position before removing the cover. The spring pops down below the selector switch where it doesn't belong, and creates a mystery on why the saw can't be switched off/keeps running. Thank you!
Nice demo Thanks! I just did the piston, rings and cylinder on my MS250. I didn't have a small ring compressor so I cut the end off a plastic tube of caulking and made my own ring compressor for the tiny piston.
Thanx dude I just fixed my stihl ms 200 after watching ur video, probably saved me a buck 50
excellent video, thanks for showing us guts of Stihl chainsaw....
thanks for watching
@Liamautomechanic chinese parts aren't the same quality. how much is an MS260 in Ireland?
WHATS UP DONY ! HOPE EVERYTHING IS GOODWITH YOU AND YOUR FAMILY,YOU R THE BEST SMALL ENGINE REPAIR GUY ON UA-cam !KEEP THE VIDEOS COMING!
@Liamautomechanic do u need parts?
Getting ready to replace piston and cylinder on mine, and perhaps everything inside. Thank you for this and your other tutorials.
i would have to see it, was it chain oil?
@ronchil u would have to remove the oil line and check to see if it is clogged or punctured. i'd have to make a vid, it's too legthy to explain
@damionparker does it have spark?
Good news. Thank you. I've narrowed it down to either the Echo CS-400 or the Stihl MS 250. I've seen the Echo in store and I'll be looking at the MS 250 tomorrow. I'll have one by the end of the day tomorrow :)
@frbarnett i have some ms180 vids up. the 180 and 250 are quite similar when taking the cylinder out
Thanks for the vids, after watching this it gave me the confidence to strip down a MS180 to replace the cylinder and piston, quite a similar procedure to this saw just a few small differences. Great work keep the vids coming.
Ended up getting the Stihl MS 290. Love it so far :)
Just got one for 2 bucks at yard sale muffler stoped up thanks for ur video like having my own library awesome ✌🏻
Hey Donyboy, thanks heaps for this video!! Helped me heaps on the tear down and rebuild of my MS250 C. Your a legend!! Keep it coming!!
Hi Donyboy73.
I just got a "second hand non-working MS250" as a hobby project.
I disassembled it and it had the exact same broken parts as yours and the defects even looked the same: Piston was partly melted ned the edges, cylinder was scratched near the exhause, one ring was broken, one ring was stuck, ball bearing was missing one ball and the whole metal "ring" holding all the steel balls.
So ... now it's time to order some new parts!
im doing exactly the same 3 years after you can you recommend this saw generally ? I have never actually used one even though im buying one!
@mazzieboy use needlenose pliers
Thank you very much you make taking these machines apart easy allot let trail and error and risk of breaking things
I do not remember if the seals go on the crankshaft with the retaining spring facing the inside or the outside?
just wanted to say thanks... i had trouble geting the clutch off ....i wasnt shure if it was a left thread or not and i was a afraid to damage the part. seeing as how i disassembled the cluth as the very last step instead as one of the first.
Awesome video; thanks for all the quality, detailed shots
@pugsonrugs if they are nikasil coated they are good, the tecomec kits are almost oem quality
can you post a video, sounds like a lot of compression
Wow! Those bearing are gone. I figured they would've come apart in the condition they were in. Great video.
where do u source ur parts,for the stihl???????????
is there any chance of stripping cylinder bolts with the rope technique? do you have to hold the cylinder down just in case?
Seem to have the same problem with my farm boss. What's the ballpark for a repair like that?
Very helpful video. Thanks a lot.
@Liamautomechanic i have to buy them at the dealer
that's great. you should make a video so we can see it. let me know. how much are they there?
@oikosecosnomikos you can find a flywheel puller on ebay and also an aftermarket cylinder kit, the oem parts from stihl are much better though
Love your videos, I have a stihl MS250 C with a cracked fuel tank, is it possible to use an MS250 chassis to replace it and modify it to fit the MS250C chain adjustment system and ignition coil
the same here,buy,i from the dealer as well,expensive tho,i wonder would the chinees parts, be up to standard???????
Thanks for all you great videos. I finally got around to fixing my Stihl 026 after watching carefully your videos and Q&A videos. I pulled the cylindar off and see one of the rings is frozen and the piston and cylindar is scared on the back side. I will get a new cylinder and piston. When parts looking I see 44 MM bore and 44.7 MM bore. is there a way I can tell on mine which bore I have so I am sure to order the right part? Thanks agian for all your effort.
Very good , you do well.. I also own a MS-250 myself and really like it ... It appears i see metal transfer , like it's been run without mix oil in the fuel ... How does the jug look inside ? good job..
Great videos. Make a rebuild doable. Just wondering if the cylinder piston and rings need some oil before firing up the chainsaw. Appreciate your help
Hi Don, any advice on removing the plastic separator (translucent white) between the cylinder head and the sprak plug/carburetor? I need to get it off to replace the ignition coil HT lead and am out of ideas.
how much for the piston and bearings for the stihl 250
You do excellent work. I enjoy all of your videos and have learned a lot by watching them. I rebuilt my Sthil 041 and used this video as a guide even though they are different saws. I now have good spark, new carburetor kit, it's getting fuel, new spark plug, good compression with a new piston and cylinder, but the saw will not start. Can you give me any ideas what I should look at next? I would really appreciate your advice!
You are awesome. Videos are so thorough. My ms 240's flywheel broke. The little alignment spline snapped off because the flywheel was hitting the ignition coil. Do I need a new coil or is there an adjustment I can make?
Thanks for the videos.
thank you....was not sure...I could see a big problem if the spring fell out while rebuilding....would wreak havoc,so I will make sure they are in the rubber before bolting cylinder on...
do you have a video that shows replacing the oil pump on a 250c stihl chain saw? I did not see one.
Thanks again. Always nice to get advice from someone that works on these things. Makes my choice a lot easier :)
@pugsonrugs they are pretty tight, make to use a good brand name torx tool, do you have pugs?
Is the flywheel/coil gap similar to a lawn mower? About a business card's thickness?
I got one of these saws for free (a neighbor was giving it away). He gave it away for a reason. Found your videos and took the saw apart to find that the piston head had a hole blown through it and was really deformed. Looks like he had no oil in the fuel-the cylinder looks burned, not shiny. Everything else looks great on the saw. Two questions: I tried tapping the flywheel off as you show, but no luck. What's the trick? And where do you order a replacement piston head and cylinder? Thanks.
@Liamautomechanic i was curious because i know some people like me ship them to folks in Ireland
i hae a stihl ms 290 i just aquired in horrible condition. i cleaned it out completely. replaced spark plug, the whole 9 yards. after many pulls of the cord it started at very high idle and rpm i might add. but now today it is jerky to pull cord. what could be the problem. i took off spark plug and tried to pull, easy as pie, install it back in, again jerk jerk jerk (end of rope).... any advice. i am lost
How do you remove the intake. Boot
I have a problem with my ms250. Clutch needle bearings failed and heat melted the housing and oil pump. Can you do a video on disassembly and repair? Thanks!
Hi! Great vids man! But i'm struggling to get the flywheel off. Do you use a special tool for this or are u just hitting on the nut?
@Liamautomechanic $100 for just piston and rings, bearings are around $40, expensive!
my stihl MS180 turns over and works fine but when i try to turn it off it won't turn off at the "0" position I have to put the lever down to cold start position to shut it off. What is wrong with it and how do I fix it?
i always learn something from you
@Karlos77777777 i think it comes with 16"
Does this seem to be a common problem in the MS 250? I was thinking about purchasing this saw for use around my home.
thank you sir
how bad does the cylinder need to be before replacing....have a scored piston ,with stuck rings on the exhaust side...cylinder has some markings that a think I can clean up....
the compression is good,the cylinder has no scratches,the exhaust is clean but still doesnt start i have good spark thanks and greetings from belgium
i have an older 066 still 135lb compression new crank seals sperkplug .It will run for about 30 seconds but sounds like the brake is on labouring.what could be wrong
Donnyboy73, I have an MS170 and trying to remove the handle to fix oil problem. What kind of tool you use to remove the screw on the handle? Thanks
torx t-27
Im looking for help please i have ms 250 replace carburetor pump all par new from sthill start but don stay on the coil spark and i dont know what i need to do all parts new lines carb pump oil filter and i can't get it going please help me gracias
Re viewed about 1/2 dozen video on the process for removing the shroud. Your video is the only presentation that takes the time to explain the process. The rest are garbage. Thank you. Despite being more than 10 years old, an outstanding video, still relevant and useful.
I have a MS180C that refuses to start. Ran for a while with old gas then it just died. Tried new gas, new carb fuel line. Looked at the cylinder from the exhaust side and the top looks like a piece is cracked off or just disintegrated. How hard it is to replace just the cylinder/rings? How do you compress the rings to insert into the casing.
check the compression
you could use a piece of dowling to push the intake boot out that way no possibility of damaging it
Thanks for your video, you saved me a bunch of time!
my ms 250 wouldn't start. I replaced fuel line and clean carb. Do you think impulse line is an issue? Compression good.
thanks for the rating
make sure the muffler spark arrester isn't plugged
yes that would be awesome!
excellent lesson
Merci don!! Jai ma compagnie depuis novembre 2011 et je repare aussi des petits moteurs!! Tu m as aider a plusieurs reprises!!
Si jammais je passe dans ton coin jte paye une couple de bieres cest sur!!!
yes
Great video! Well done.
I have an MS250. Is it possible to remove and replace the intake boot with out pulling the cylinder? Does the white plastic plate have it captured is there a clamp holding the boot to the cylinder? Great Videos by the way. After I'm done with the chainsaw I plan on tackling my pressure washer.
Donyboy73 did u know what size screw I need to take the cover off on my Sthil FS56rc?!?
Is it a reverse thread on the flywheel?
Thanks' for a great video. I'm about to do mine using this video.
great video! anybody have any thoughts on why the bearings were shot and the piston was damaged?
Maybe he turned the "High" adjusting screw too far in (clockwise/lean). which would make it run hot. Or maybe he didn't warm it up a bit before putting it to work. The shutter may have been set for "winter", and he forgot to set the shutter for "summer"when the season changed, which would probably make it run too hot. Or maybe bad oil to gas ratio?
facing inside
i went to the Stihl dealer and 2 mechanics looked at it because it is unusual. apparently it's a bearing defect. the ball retainer on it broke off.
Anna ms251 how do I connect the trigger ride up to the carburetor up there does anybody know
Nice video, but The wires related to the ignition circuit can be taken off at the top end, They have modular connectors just pop out. Don't have to take off the induction coil.
donyboy73 i have a chainsaw it doenst start i put a new carburetor ,new fuel lines,new spark plug,new air filter and still doesn't start what is the problem can you help me with this problem.thank you
I have a Stihl MS-250 chainsaw, and it have been down and in the shop more than it has been used in work. Instead, I have had to depend on my old Poulin chainsaw which I have had since 2000. I just got both saws out of the shop and the the Stihl is back to doing what it did since I had it, not cranking. The Poulin will start and works fine for me.
cost me about $450 to repair an 036 Pro in the Stihl shop and then I fried a piston after 4 gallons of gas, don't know if it is related or not. I did replace oiler, rings and some other stuff while it was apart
yes very similar, in your case you will more likely need the cylinder as well
i think the top of the piston resulted in heat damage due to lower quality metal. I know older saws had stronger but heavier crankshafts and pistons
Thanks man. Very helpful.
So my ms 250 will start, but will not run, only runs when i keep the throttle pressed down to keep it running, once i let go of the throttle the chainsaw dies, what would the problem be?
+Eric Kanakakeesic turn in the idle screw, LA
So i did turn the LA screw, tried different positions, but it still dies out when its on the run position, not sure what is the cause is.
+Eric Kanakakeesic I have an ms 250 that was behaving similarly, and flooding very easily too, and it was caused by a malfunctioning fuel tank. It would start up and run fine if I remove the plastic cap on the fuel tank vent next to the carburetor