In loving memory of Kenis D. Keathley 6/4/81 - 3/27/22 Loving father, husband, brother, friend and firewood hoarder Rest in peace, Dexterday

MS290 starting issue

Discussion in 'Chainsaws and Power Equipment' started by Kimberly, Apr 10, 2016.

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  1. bobdog2o02

    bobdog2o02

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    Where did you order from? Hard to find good suppliers on these things.
     
    bobdog2o02, May 7, 2016
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  2. HDRock

    HDRock

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    You got a pic of , flywheel ?
     
    HDRock, May 7, 2016
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  3. jon1212

    jon1212

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    I believe you have the fliberty gibet confused with the widget/doodad assembly. No big deal, as it's a common mistake.
     
    jon1212, May 8, 2016
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  4. Kimberly

    Kimberly

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    I will take the starter and clutch cover off today and get some good photos.
     
    Kimberly, May 8, 2016
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  5. MasterMech

    MasterMech The Mechanical Moderator

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    Kimberly, I've been trying to find the video that explains why this happens in Stihls but I haven't been successful. Basically the pawls and rotor wear to the point where they no longer properly align with the flywheel when they engage. If the fit of the pawls in the rotor is poor (hard to describe unless you have new pawls and rotor right there in front of you) then they attempt to jam when engaged with the flywheel.

    If the saw turns over normally with the plug removed then I'd replace the rope rotor in the starter next. Good opportunity to replace the rope if it's worn at all too.
     
    MasterMech, May 8, 2016
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  6. NH_Wood

    NH_Wood

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    Had this happen with an Echo trimmer a guy took in for me to fix. Pull start wouldn't budge as if locked up. Ended up being an extremely flooded engine - carb needle wouldn't seat and poured out a lot of old gas from the cylinder. Once the gas was gone engine turned over just fine. Waiting on new carb to arrive this week. Cheers!
     
    NH_Wood, May 8, 2016
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  7. Kimberly

    Kimberly

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    OK, took the bar side cover off, clutch is free. Remove the spark plug and the flywheel rotated freely by hand. Put the starter back on and plug back in and I tried pulling without the bar and chain on the powerhead and it was jerky, I could pull it out but it jerked each pull, instead of pulling out smoothly it jerked as it came to each compression/exhaust, jerk, jerk, jerk. My friend keeps talking about the decompression valve but I have been told there is none on this saw.

    Here are photos of the flywheel.

    PICT3561.JPG
    PICT3562.JPG
     
    Kimberly, May 8, 2016
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  8. Kimberly

    Kimberly

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    With the starter off I pulled the rope and the pawls move out smoothly and freely and there is no resistance on the rope.
     
    Kimberly, May 8, 2016
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  9. Kimberly

    Kimberly

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    I replaced the pawl, what is the rotor you mention?
     
    Kimberly, May 8, 2016
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  10. clemsonfor

    clemsonfor

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    Yea that saw HAS no decompression valve . It never did. And assuming the member who gifted it to you or whatever did not put a 390 top end on it, it is impossible for it to have a decomp.

    But I am pretty sure this is a bone stock saw so it HAS NO decompression valve.

    I think master mech is spot on on this one. Either buy or find a used 1127 starting mechanism or buy the reel like MM suggested
     
    clemsonfor, May 8, 2016
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  11. clemsonfor

    clemsonfor

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    The part the rope winds on.
     
    clemsonfor, May 8, 2016
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  12. MasterMech

    MasterMech The Mechanical Moderator

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    It's something that only happens under load, i.e. Pulling the rope with the pawls engaged to the flywheel. The holes the pawls sit in in the rotor (rope pulley) can get worn out of round over time and this allows the pawls to be wedged in between the flywheel and the rotor rather than engaging and remaining perfectly parallel to the flywheel and rotor.

    If all reasonable effort fails to get this thing behaving, let me know. you're welcome to send it up here (just the power head, drain gas/oil and remove the bar/chain) and I can try hypnotism or voodoo therapy if all else fails. Of course I don't charge for these experimental treatments or the return shipping. I might even post the results for the good of the community. And stuff.
     
    MasterMech, May 8, 2016
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  13. Kimberly

    Kimberly

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    OK, I think I understand. I will replace the rotor. and let you know; what do I need to know about replacing the rotor before I start so I don't get in trouble.
     
    Kimberly, May 8, 2016
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  14. Mag Craft

    Mag Craft

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    It must be something like Master Mech is referring to, because I do not see anything abnormal from the pics.
     
    Mag Craft, May 8, 2016
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  15. MasterMech

    MasterMech The Mechanical Moderator

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    Unwind the spring tension very carefully when you pull it off. When there is no more tension, you should be able to pull it straight out without disturbing the spring. Saves you having to rewind the spring.
     
    MasterMech, May 8, 2016
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  16. Kimberly

    Kimberly

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    New rotor ordered, will update this post when it arrives and I get it installed. Thanks for the help everyone, it is appreciated.
     
    Kimberly, May 8, 2016
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  17. clemsonfor

    clemsonfor

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    Pay attention his his details on the spring!
     
    clemsonfor, May 8, 2016
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  18. DexterDay

    DexterDay Administrator

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    I just fixed 2 saws this weekend that 2 friends said they didn't run...

    One was a Stihl 180, the other was a MS 250..

    Both ran within 5 pulls. Both owned them since new.

    How old is the friend that is trying to start your 290?
     
    DexterDay, May 9, 2016
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  19. clemsonfor

    clemsonfor

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    I "fixed" a 026 just like you described a few weeks ago that was my uncle. He is about 67 but his son who also said it was broken is 38???

    I don't know I had no trouble with it and therefore I "fixed" it.
     
    Last edited: May 9, 2016
    clemsonfor, May 9, 2016
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  20. DexterDay

    DexterDay Administrator

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    Starting procedure is paramount.

    Regardless of age. The guy with the 180 told me it wouldn't start at all. 3 pulls (2w/choke and 1/on high idle) and she was running... I ran it for 30 minutes today.

    Not saying the pawls on Kim's saw isn't the problem, but sometimes it's a procedural problem
     
    DexterDay, May 9, 2016
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