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My 576xp just quit. Looking for guidance

Discussion in 'Chainsaws and Power Equipment' started by mywaynow, Dec 8, 2018.

  1. Casper

    Casper

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    I've been having problems with both Bosch and NGK.
     
  2. The Wood Wolverine

    The Wood Wolverine

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    I've been Denso faithful for a few years now. The W22MPR-U is the cross to the BPMR7A.
     
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  3. Canadian border VT

    Canadian border VT

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  4. mywaynow

    mywaynow

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    Anyone have any input on those ohm readings?
     
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  5. The Wood Wolverine

    The Wood Wolverine

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    Sorry, I do not.
    Can you determine if the flywheel magnet reaches the coil gap at about top dead center? If you sheared a key, it would be off, preventing the saw from running, and could have been your slow death as it moved further from where it should have been.
     
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  6. mywaynow

    mywaynow

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    I got that inclination from a friend today. Looks like I need a puller to remove the fly? Piston seems tdc when the mag swipes the coil. I suppose a few degrees would not be visibly obvious though. Looks like a trip to the shop is in the near future. Hate paying other people to fix my chit....
     
  7. The Wood Wolverine

    The Wood Wolverine

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    Make a puller. IMG_0651.JPG
     
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  8. Redfin

    Redfin

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  9. mywaynow

    mywaynow

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    I have steering wheel pullers that should do just this task.
     
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  10. mywaynow

    mywaynow

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    Key was intact. Spindle has no evidence of key drift. Shot some starter fluid directly into the piston and still no ignition. Baffled.
     
  11. amateur cutter

    amateur cutter

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    Not to sound like a broken record, but, spark fuel & compression. Which are we missing?
     
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  12. brenndatomu

    brenndatomu

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    Maybe lost a crank seal...
     
  13. The Wood Wolverine

    The Wood Wolverine

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    Piston pic sans muffler might help.

    If ya have no spark, a good coil would eliminate that possibility. Don’t waste your time chinese ones. Ask me how I know.
     
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  14. brenndatomu

    brenndatomu

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    Autozone (and others) has loaner compression gauge kits...
     
  15. huskihl

    huskihl

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    My fone has a camera....



    Cuz we likes pics
     
  16. mywaynow

    mywaynow

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    Compression is not the issue for sure. If the decomp is not activated the pull is a b**ch just as it always has been. I think I am going to pull the carb next. Maybe the presence of fuel vs adequate fuel is the issue.
     
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  17. amateur cutter

    amateur cutter

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    I
    If it won't even pop on mix or carb cleaner l'd bet it's spark. Weak or missing under compresssion. A plug or weak coil will sometimes show an orange spark in the open & not fire in the cylinder. Should be a blue spark even at .
    .030 gap on a tester. If not, weak coil is a good bet.
     
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  18. mywaynow

    mywaynow

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    Spark was blue. Could only see it in the dark with a quick pull. A wise man once said "A man has to know his limitations". I sense mine are slapping me in the face.
     
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  19. ChipsFlyin

    ChipsFlyin

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    It's sounding like fuel is OK . To completely rule out or rule in the coil try wrapping the entire spark plug wire up to the coil including the boot with electrical tape. If you were running hard maybe the insulation heated up and created a micro hole or fracture that you can not see. Even though you got spark with the plug out the wire may be positional. In the past I have a car that ran funny from a similar issue. I could not see where the boot was compromised. It's just an idea and cheap test.
     
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  20. mywaynow

    mywaynow

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    Good thought. I was just finishing up checking the plug wire to what extent I could. Tried resistance at the plug end while twisting and pulling the wire looking for shorts. I wrapped the wire twice with electrical tape. No dice. If I worked at my job for all these hours of effing with the saw I could dam near buy another. Uggh. Smelled fuel as I tried to get her running, so again have to rule out catastrophic carb failure. Seems most of these ghost problems are electrical. Going to order a new coil today.
     
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