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  1. #1
    Veteran Member
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    Jul 2003
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    1,692
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    SW Indiana
    Tractor
    Ford 1920 4x4 (traded in on Kubota). Case 480F TLB w/4 in 1 bucket, 4x4. Gehl CTL60 tracked loader, Kubota L4330 GST

    Default Stihl chainsaw almost locked up-?

    Hello,

    I can barely pull the starter cord on my small Stihl (model 009). It will turn over once with a hard enough pull. Air filter is clean and it turns freely with the spark plug removed. Worked ok the last time out- maybe 3 yrs ago. I was hoping to use it in the morning. Any suggestions?

    Thanks,

    JOhn

  2. #2
    Elite Member RalphVa's Avatar
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    Dec 2003
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    4,521
    Location
    Charlottesville, VA, USA
    Tractor
    JD 2025R, previously Gravely 5650 & JD 4010 & JD 1025R

    Default Re: Stihl chainsaw almost locked up-?

    Did you try it after you put the plug back in?

    What'll lock them up is fuel sucked in and attempt made to compress it.

    Be sure you're trying to start it with the throttle locked on. If the lock doesn't work, tie a cord to lock it full open. Two cycle engines have got to have the throttle full on to start properly.

    The routine usually is lock on throttle. Pull 2 to 4 times with full choke until it fires. Then about 1/2 choke, pull, and it starts. Use the same routine with my 2 cycle grass whip.

    My 009L still works after more than 35 years. Think I bought it in 1972.

    Sometimes, a shot of starting fluid into the air cleaner hole is needed but usually only on very cold days.

    Ralph
    The natural gardener
    God's original intent

  3. #3
    Veteran Member
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    Jul 2003
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    SW Indiana
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    Ford 1920 4x4 (traded in on Kubota). Case 480F TLB w/4 in 1 bucket, 4x4. Gehl CTL60 tracked loader, Kubota L4330 GST

    Default Re: Stihl chainsaw almost locked up-?

    Hi Ralph,

    I put the plug back in and it still pulls hard and just makes it thru the compression cycle once. And that's with the throttle locked open. I'm pretty sure it has something to do with the cylinder being completely sealed during one phase of the stroke.

    Thanks,

    John

  4. #4
    New Member
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    Oct 2009
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    3

    Default Re: Stihl chainsaw almost locked up-?

    Quote Originally Posted by jmc View Post
    Hi Ralph,

    I put the plug back in and it still pulls hard and just makes it thru the compression cycle once. And that's with the throttle locked open. I'm pretty sure it has something to do with the cylinder being completely sealed during one phase of the stroke.

    Thanks,

    John
    Is it a new plug? Its not too long is it? Just a wild guess.

  5. #5
    New Member
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    Oct 2009
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    3

    Default Re: Stihl chainsaw almost locked up-?

    Quote Originally Posted by jmc View Post
    Hi Ralph,

    I put the plug back in and it still pulls hard and just makes it thru the compression cycle once. And that's with the throttle locked open. I'm pretty sure it has something to do with the cylinder being completely sealed during one phase of the stroke.

    Thanks,

    John
    Sounds like the piston is hitting the spark plug. Did you recently replace the plug? If so make sure its not too long.

  6. #6
    Elite Member
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    Apr 2009
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    3,202
    Location
    adirondacks

    Default Re: Stihl chainsaw almost locked up-?

    If it pulled over easy with out the plug then jammed again with it I'd take a hard look at the plug. I'd also stay away from starting fluid, not really a good solution to any engine.

  7. #7
    Veteran Member Treemonkey1000's Avatar
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    Jan 2008
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    1,894
    Location
    Renton, Washington
    Tractor
    Kubota L3750

    Default Re: Stihl chainsaw almost locked up-?

    Make sure it isn't your rope pull binding. If the case is cracked or the pulley is binding that will make it hard to pull. Been there done that. That is a pretty small motor so it shouldn't take much to spin it under normal conditions. With the plug out and it still binds then I would look at the rope pull portion. The pulley holding the rope can get dirt and grit under it and bind up pretty good. Just be careful if you get into that as the recoil spring can get you. Plus putting that recoil spring in is more fun than a Proctologist visit.
    1st Peter 1:6-9

  8. #8
    Super Member
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    Dec 2003
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    8,746
    Location
    NC
    Tractor
    Kubota Grand L3830

    Default Re: Stihl chainsaw almost locked up-?

    Quote Originally Posted by jmc View Post
    Hello,

    I can barely pull the starter cord on my small Stihl (model 009). It will turn over once with a hard enough pull. Air filter is clean and it turns freely with the spark plug removed. Worked ok the last time out- maybe 3 yrs ago. I was hoping to use it in the morning. Any suggestions?

    Thanks,

    JOhn
    Remove the muffler and clean the exhaust port. It sounds like carbon is blocking the exhaust port and not allowing the engine to breathe. When the spark plug is out, the engine will spin freely because it can breathe. Use a sharp pointed wooden stck to clean the ports, do not use a screw driver. Also when cleaning the ports, pull the start rope and move the piston away from the port. The muffler can also be stopped up causing the engine to be unable to exhaust air. So, if the exhaust port was clean when you removed the muffler check the muffler for an obstruction.

  9. #9
    Veteran Member
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    Jul 2003
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    1,692
    Location
    SW Indiana
    Tractor
    Ford 1920 4x4 (traded in on Kubota). Case 480F TLB w/4 in 1 bucket, 4x4. Gehl CTL60 tracked loader, Kubota L4330 GST

    Default Re: Stihl chainsaw almost locked up-?

    OP here. Thanks for the responses. It's definitely not the plug or pull cord. You can here air/gas escaping very slowly on the compression stroke. I had started to remove the muffler but it's got a metric torx screw deep in a counterbore, probably tighter than the dickens. I'll do that as a last resort since it seems like a plugged exhaust would have been noticable the last time I used it.

    In the meantime, as I look down thru the carb throat it seems like I should be able to see into the cylinder at some point in the cycle. I can't but there is something relective down there that deflects a little at one point in the cycle. This motor may have a reed valve stuck in there someplace, which would be consistant with not using it for several years and not draining it of gas before that. Any comments on that?

    Also, my can of carb cleaner does not recommend squirting it into the carb if the engine is not running. How do I clean this up if there's varnish in there?

    Thanks,

    John

  10. #10
    Super Member newbury's Avatar
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    Jan 2009
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    7,501
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    From Vt, in Va, retiring to MS
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    Kubota's - B7610, M4700

    Default Re: Stihl chainsaw almost locked up-?

    Take it to http://www.arboristsite.com/, they are the experts.

    Lot more chainsaw users.
    My rides - '95 Kubota M4700 w/ PEC, LA1001 FEL :'07 B7610, LA352 FEL, Bush Hog SBX 48 box blade, '09 Woods BH70-X w/ 16" bucket and thumb, 3pt pallet forks, Dale Phillips PHD, Jinma 8" chipper, 2 Piranha's, Winco 12KW PTO generator, Howse plow, 5' KK tiller, 5' Big Bee cutter, with a 2002 7.3L Ford F350 CC DRW 4x4 and '07 18' Hudson HSE Deluxe trailer - 5 Ton to haul it all
    My saws - JD CS 62, efco 3500, Stihls - 021, 660 w/woods mod, 660 w/ DP muffler, 088, Woodmizer LT10

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