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stihl 200t runs then dies????

Discussion in 'Chainsaw' started by browneye, Feb 3, 2010.

  1. browneye

    browneye ArboristSite Operative

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    i have a used 200t that had been running good,i changed the fuel filter didnt fix,cleaned the muffler,air filter ,new spark plug,checked the tank vent,i had been reading some threads on this saw and i cant figure it out..i have two 200t i have been swapping parts back and forth....any ideas i am wondering if its low compression or the coil???thanks
     
  2. cjnspecial

    cjnspecial AboristSite Guru

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    If one runs well, swap the carb out and see if that fixes it. Carbs are a weak link on this saw. A few other things to check are:
    1. Clogged muffler screen
    2. Cracked intake book.
    3. Cracked fuel line.
    4. Cracked or disconnected impulse hose.

    How long does it run before it dies?

    http://www.arboristsite.com/showthread.php?p=1752506#post1752506
     
  3. browneye

    browneye ArboristSite Operative

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    200t

    i did swap the the carb didnt work.it starts and runs for 10 to 30 seconds before it boggs out and dies when im trying to give it gas..
     
  4. parrisw

    parrisw Tree Freak

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    Check the impulse line and intake boot for tears. If intake is torn, check AV mounts for weakness.
     
  5. Paul001

    Paul001 Addicted to ArboristSite

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    As noted Carb Boot (will show up on pressure/vac test), impulse hose (will show up on pressure/vac test), fuel line pickup (you can pressure test for leaks).

    One of the more common issues with this saw, it gets stuck in the cut, climber yanks back (we all know how gentle climbers are) and rips an AV. Keeps running it, allows to much flex which takes out the carb boot.

    Impulse hose under the carb is known to come loose. Gentle lift up the recoil side of the handle housing and see if it's disconnected.

    Pull the chain cover off, bottom two bolts holding the mufffler and remove muffler, you can get a good look at the piston. Any scoring? Need to pull muffler anyway to do your pressure vac test.

    When it runs will it rev up correctly or is it starving for fuel and barely getting on?

    Need to give us a bit more detailed info. As well as check my sig for how to preform a pressure/vac test.
     
  6. browneye

    browneye ArboristSite Operative

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    200t

    when it starts it revs up alittle bit for a few seconds but wont run wide open before it just dies even if you just try to get it to idle.i dont have the stuff to pressure test it yet...i am working on that
     
  7. blsnelling

    blsnelling Site Sponsor

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    Doesn't sound like an air leak. It still sounds like a fuel supply problem to me. Double check the pickup and fuel line. If not that, the MS200T has had lots of known carb problems. The only fix is a new carb.
     
  8. lone wolf

    lone wolf Tree Freak

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    I think its the impulse line, is it connected , maybe a pin hole take it off and check it see if it holds pressure,you said you swapped carbs and it runs the same?
     
  9. teacherman

    teacherman Addicted to ArboristSite

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    Mine did exactly the same thing, it was very frustrating. Apparently the new carbs do not have that problem, and that is what fixed mine. About 80.00 and fifteen minutes.
     
  10. lone wolf

    lone wolf Tree Freak

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    if you swapped the carb and does the same thing im sure its the impulse line if you have good compression what is the exact compression please post? btw you can use hi temp vac.line to replace the impulse line no need to order it take the old one to auto store and match it up.
     
    Last edited: Feb 4, 2010
  11. lone wolf

    lone wolf Tree Freak

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    never had a coil go bad on that type saw yet
     
  12. Paul001

    Paul001 Addicted to ArboristSite

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    I've had a few, they'll drive you nuts when you do get one. Intermittent, can act like a fuel delivery issue.

    As for this saw, pull the recoil off, you can access the impulse hose from there. Remove and grab a 6" piece from your saw shop or auto parts store.

    Brad,

    I'm not saying it's a crank seal, I think its the impulse line (have had way to many act this way, normally a bad AV mount which allows the impluse to be pulled off) but if he had the tools to do a pressure test, it would also show the impluse issue. Pressure test can also be used to test the fuel pick up, and the carb.

    But I know you know that :)
     
  13. lone wolf

    lone wolf Tree Freak

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    how much luck have you had pressure testing carbs?
     
  14. Paul001

    Paul001 Addicted to ArboristSite

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    I've found a few gaskets, but I do it out of habit more than anything. Another line checked off in my mental diagnostic list.

    My time honestly would be better spent stripping the carb down, pull needle and low jet and toss into the ultrasonic cleaner. Reassemble and fire. I did work with an old school mech who pressure tested every carb (including some funky setup he built out of a pair of vice grips to block off the intake/outlet). Without question the best 2 cycle mech I've been lucky enough to work along side of.

    Guess I'm just hoping that if I keep at it one day I'll solve the mystery...
     
  15. Rftreeman

    Rftreeman Addicted to ArboristSite

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    mine was doing the same thing and i manged to get it to work half way decent by tuning it but it will still bog a bit from idle to wot every now and then...

    does anyone know exactly what the problem is/was with the old carbs...
     
  16. pgg

    pgg Banned

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    The o-ring in the carbs accelerator pump wears and lets air in, the no-nonsense non-accel pump carbs last forever, the wires from the coil to the switch are tucked in under the flywheel and thru the casing out of sight, if the wiring is dodgy, the saw will play up too
     
  17. browneye

    browneye ArboristSite Operative

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    figured it out today

    i found the problem it was a bad spot in the impulse line .it was like it was kinked and it was spongy in that spot i couldnt believ it. i have had the whole saw apart trying to figure it out .i put a new one on it and it fired right up and sounds better than it ever has....thanks guys for the info
     
  18. lone wolf

    lone wolf Tree Freak

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  19. Paul001

    Paul001 Addicted to ArboristSite

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    Last edited: Feb 4, 2010

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