Welcome, Guest. Please login or register.

Author Topic: Stihl chainsaw carb repair  (Read 341 times)

GoJakesGo

  • SnoPro
  • *****
  • Posts: 2065
  • Garage fire expert and PETT member #88
Stihl chainsaw carb repair
« on: July 01, 2020, 10:01:17 am »
Picked up a Stihl ms180c chainsaw from a garage sale. Gentleman said it wouldn't shut off unless choked and it won't idle but starts and revs fine.

Got it home, started cleaning it. Removed the cover and found the kill wire had simply pulled off the switch-fixed that issue. Saw starts and runs great at 1/3+ throttle. Cleaned the filter, new gas, but this saw ONLY has an adjustable idle screw. Didn't have time to adjust but I'm fairly certain that adjustment won't fix the issue. Anyone have luck tearing these type of carbs apart? Nearly Stihl part is out-of-stock at the moment so finding a carb kit will be fun.
70' Chap Firebird 399   70' Chap Executive 399
71' Sno Jet SuperJet 396  72' Sno Jet SuperJet 433                     73' Sno Jet Star Jet 433   74' Polaris Electra 440
94' Polaris RXL SKS 650 MOD

Vintagesleds.com

  • Advertisement
  • ***

    399jlo

    • BS Hall Of Fame Member
    • ******
    • Posts: 5815
    Re: Stihl chainsaw carb repair
    « Reply #1 on: July 01, 2020, 10:29:16 am »
    Check for a clogged screen by exhaust port. It goes between mufflee and crankcase.
    PETT member #60

    Kingsville Doo Nut

    • SnoPro
    • *****
    • Posts: 417
    Re: Stihl chainsaw carb repair
    « Reply #2 on: July 01, 2020, 10:41:31 am »
    I've got an MS250 and my kill switch wire did the same thing. So must be a common problem.  I've had mine for at least 6 years and have never had to mess with the carb but if I were you I wouldn't hesitate to get into that carb and give it a good cleaning. Your idle circuit is possibly plugged up (assuming it has one like a sled carb) and you may not even really need a kit as log as you are careful and don't destroy any gaskets. Try taking it slow.  For the tiny orifices in the carb body and jets i like to take my small vice grips and yank out a straight strand of wire from my steel wire brush. Work it carefully through all the orifices as to not damage any of them.  If you use carb cleaner be careful as it might damage rubber parts. Sorry if you know all of this already.
    Get everything all opened up and I bet that baby will purr like a kitten.
    « Last Edit: July 01, 2020, 10:44:18 am by Kingsville Doo Nut »
    PETT No. 119
    67 Olympique 250
    70 TNT 292 (slides)
    70 Olympique 12/3
    70 Ski Boose MK I
    72 Nordic 640ER
    72 Charger 530SS
    75 Olympique 300
    Chrystler Sno Runner (2)
    81 Citation 4500e (2 of em!)
    02 Legend GS 600
    2011 GSX LE 600 E-tec

    rusthound

    • SnoPro
    • *****
    • Posts: 1882
    Re: Stihl chainsaw carb repair
    « Reply #3 on: July 01, 2020, 11:44:51 am »

      You could try the 99 cent tune up.  If you can cover the inlet of the carb.  Start the saw open up to full and then shut the air off fully going into carb hold full until saw quits.  let it sit to unflood and try your luck.  Works on larger motor stuff may work on this .. It's in simple form vacuums out the inside of the carb.   

    GoJakesGo

    • SnoPro
    • *****
    • Posts: 2065
    • Garage fire expert and PETT member #88
    Re: Stihl chainsaw carb repair
    « Reply #4 on: July 01, 2020, 12:54:14 pm »
    Thanks for the tips. I'll keep poking around with it. Guys at work suggested I run a fuel treatment product called Mechanic In A Bottle in it?  Anyone try this stuff?  Nothing beats a thorough carb cleaning but this saw carb doesn't appear to be very user friendly with very limited adjustments
    70' Chap Firebird 399   70' Chap Executive 399
    71' Sno Jet SuperJet 396  72' Sno Jet SuperJet 433                     73' Sno Jet Star Jet 433   74' Polaris Electra 440
    94' Polaris RXL SKS 650 MOD

    Skier76

    • SnoPro
    • *****
    • Posts: 254
    • CT and Southern Vermont
    Re: Stihl chainsaw carb repair
    « Reply #5 on: July 01, 2020, 01:06:49 pm »
    I think that's the saw my father in law has. He had some carb issues with it. Mixed some Seafoam in the gas, ran it, let it sit for awhile (possibly overnight) fired up and ran fine after that. May be worth a shot.
    1996 Puma 2-up
    1996 Jag

    Lanceman9

    • SnoPro
    • *****
    • Posts: 778
    • Move Over, People Are Racing!
    Re: Stihl chainsaw carb repair
    « Reply #6 on: July 01, 2020, 01:10:12 pm »
    If the low speed screw has a plastic cover to limit how far you can turn it pull that off and turn it about 1/4  more open. My top handle Stihl wouldn't rev up till I did that.
    « Last Edit: July 01, 2020, 01:11:46 pm by Lanceman9 »
    Speed costs money, how fast do you want to go?

    GHenry

    • BS Hall Of Fame Member
    • ******
    • Posts: 16657
    • Some people aren't really all that they post to be
    Re: Stihl chainsaw carb repair
    « Reply #7 on: July 01, 2020, 03:14:37 pm »
    ... run race fuel through it, will "always" run like it should and smells great too.
    VINTAGE YAMAHA PARTS AND RESTORATIONS-

    AVAILABLE THROUGH KOCHS PERFORMANCE, MIDDLE INLET WISCONSIN

    (715) 854 - 2463

    LEON AND PENNE WOULD BE HAPPY TO ASSIST ANYONE IN NEED

    AWARD WINNING RESTORATIONS

    VINTAGE YAMAHA PARTS

    GIVE THEM A CALL, THEY WOULD LOVE TO HEAR FROM YOU

    JLOpower

    • Official Curmudgeon
    • Global Moderator
    • BS Hall Of Fame Member
    • *****
    • Posts: 8372
    • Fresh Snow makes me Whiz
      • Ski Whiz Rescue Mission
    Re: Stihl chainsaw carb repair
    « Reply #8 on: July 01, 2020, 03:54:55 pm »
    I have a MS210 which is just a slightly larger bore version of the MS180.

    My saw needs a new fuel line once a year. Either right at the start of the season or later in the season just as you need it as a rescue saw in the woods. The lines split near the grommet where the line passes through the tank. The first few times I bought the OEM Stihl lines but they don't seem to hold up any better than the cheap aftermarket versions. I usually empty the fuel tank before I put the saw in the toolbox just because ethanol free fuel is scarce around my place.
    Money can't buy happiness, but it can buy vintage snowmobiles.

    duallydave

    • SnoPro
    • *****
    • Posts: 1864
    Re: Stihl chainsaw carb repair
    « Reply #9 on: July 01, 2020, 04:44:13 pm »
    JLO, Stewart's on Main St. in Oneonta should have 91 octane non-E.

    Teamgreen711

    • SnoPro
    • *****
    • Posts: 289
    • Five restos later and still going strong!
    Re: Stihl chainsaw carb repair
    « Reply #10 on: July 01, 2020, 08:25:37 pm »
    Mechanic in a can is Seafoam. Pour a good amount in the tank and let her run. You can try cleaning the carb but the Seafoam really does a great job. Use triple amount they say to use.

    If not that then buy a brand new Carb off of Amazon . I got one for my Honda Log splitter for 25 bucks and runs like a champ.

    Hope this helps,Teamgreen
    1976 440  Sno Twister-five months of pure hell!
    1974 Sno Twister 400-Yep she's fast!
    1976 440 Trail Twister- First resto
    1975 340 Sno Twister-resto finished!
    1973 Speedway Max 440
    1972 Kitty Kat-
    1972 Kitty Kat-grandson loves it!

    polarisracer

    • SnoPro
    • *****
    • Posts: 231
    Re: Stihl chainsaw carb repair
    « Reply #11 on: Today at 02:34:12 am »
    Not even worth your time to try to clean a carb anymore. For the price they are now, just buy a new one. Been there done that.

    troy

    Tom Priebe

    • SnoPro
    • *****
    • Posts: 1450
    Re: Stihl chainsaw carb repair
    « Reply #12 on: Today at 02:35:51 am »
    GH has it covered.  Bought all my Stihl stuff from Doug Hayes.  Bought the extra little bottles of oil for the extended warranty.  I told Doug that I ran old race gas in everything.  He said to keep doing it....  Never have changed the spark  plugs in my 20+ year old 021...  It can be 5 years old and still works.  A single 5 gallon can is a bargain in comparison.
    Pay no attention to the man behind the green curtain!

    GHenry

    • BS Hall Of Fame Member
    • ******
    • Posts: 16657
    • Some people aren't really all that they post to be
    Re: Stihl chainsaw carb repair
    « Reply #13 on: Today at 03:25:18 am »
    Yes sir Dr. Priebe ............ my ole Farm Boss is still running the original spark plug after twenty some years.  And did I mention the smell ???????
    VINTAGE YAMAHA PARTS AND RESTORATIONS-

    AVAILABLE THROUGH KOCHS PERFORMANCE, MIDDLE INLET WISCONSIN

    (715) 854 - 2463

    LEON AND PENNE WOULD BE HAPPY TO ASSIST ANYONE IN NEED

    AWARD WINNING RESTORATIONS

    VINTAGE YAMAHA PARTS

    GIVE THEM A CALL, THEY WOULD LOVE TO HEAR FROM YOU

    duallydave

    • SnoPro
    • *****
    • Posts: 1864
    Re: Stihl chainsaw carb repair
    « Reply #14 on: Today at 11:54:04 am »
    G---   that an 041 Farm Boss?