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  1. #1

    Join Date
    Apr 2012
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    Australia
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    JDLT155x2/JD415/Deutscher Tractors16-600hp/Farm/Earthmoving Equip

    Husqvarna 455 Chainsaw - Lost Power ?

    Still in the workshop tonight & trying to fix a Husky 455 that just about has us beat - the thing starts, runs & cuts fine for the first tank of fuel........but when hot from the second tank on just loses power & will not rev underload enough to get on the power band to cut with its usual power ( although it still starts fine & revs out unloaded).
    We've tried everything we can think of - changed the air filter, cleaned the fuel pick up, wound the high jet up, checked the compression, changed the spark plug, cleaned the exhaust & the spark arrestor, even swapped the carby with another of our 455's with still no result on the original saw.........first time we've ever experienced this issue with a Husky, & this particular 455 up until last weekend would cut all day "punching" well beyond its "weight" without ever an issue............

    Anything we may have missed, or ideas on what else to check ?

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  3. #2

    Join Date
    Aug 2012
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    17
    Location
    Oregon
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    briggs

    Maybe the gas cap not venting?

  4. #3

    1,000 Post Club

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    Jul 2011
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    1,007
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    Connecticut
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    Scag Tiger Cub, Ingersoll 4018, Hustler X-ONE MoJack Pro

    Exclamation Re: Husqvarna 455 Chainsaw - Lost Power ?

    Chainsaw fuel caps do not vent.
    Compression?
    Compression release valve?
    Intake tube?
    Fuel lines leaking?
    Fuel filter?
    Flywheel key sheared?

  5. #4
    dec967's Avatar
    Join Date
    May 2013
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    New York
    Mower
    Simplicity

    Cool Re: Husqvarna 455 Chainsaw - Lost Power ?

    Check the choke and make sure its not sticking. Compression release valve

  6. #5

    Join Date
    Oct 2010
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    243
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    Mulvane Kansas
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    Craftsman

    Re: Husqvarna 455 Chainsaw - Lost Power ?

    Quote Originally Posted by MBTRAC View Post
    Still in the workshop tonight & trying to fix a Husky 455 that just about has us beat - the thing starts, runs & cuts fine for the first tank of fuel........but when hot from the second tank on just loses power & will not rev underload enough to get on the power band to cut with its usual power ( although it still starts fine & revs out unloaded).
    We've tried everything we can think of - changed the air filter, cleaned the fuel pick up, wound the high jet up, checked the compression, changed the spark plug, cleaned the exhaust & the spark arrestor, even swapped the carby with another of our 455's with still no result on the original saw.........first time we've ever experienced this issue with a Husky, & this particular 455 up until last weekend would cut all day "punching" well beyond its "weight" without ever an issue............

    Anything we may have missed, or ideas on what else to check ?
    If it loses power after it gets hot and won't hold a load I would consider trying another coil. Good luck Down Under!!

  7. #6

    Join Date
    Apr 2012
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    Australia
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    JDLT155x2/JD415/Deutscher Tractors16-600hp/Farm/Earthmoving Equip

    Re: Husqvarna 455 Chainsaw - Lost Power ?

    Quote Originally Posted by Ifixdit View Post
    If it loses power after it gets hot and won't hold a load I would consider trying another coil. Good luck Down Under!!
    Thanks & appreciate all the good thoughts - I'll swap out the coil at the weekend & see how it goes.........

  8. #7

    Join Date
    Jun 2011
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    112
    Location
    Fowlerville MI
    Mower
    Ferris

    Re: Husqvarna 455 Chainsaw - Lost Power ?

    Quote Originally Posted by MBTRAC View Post
    Thanks & appreciate all the good thoughts - I'll swap out the coil at the weekend & see how it goes.........

    I had this happen before and it was the clutch


    Rob

  9. #8

    Join Date
    Apr 2012
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    Australia
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    JDLT155x2/JD415/Deutscher Tractors16-600hp/Farm/Earthmoving Equip

    Re: Husqvarna 455 Chainsaw - Lost Power ?

    This 455 had me (& I might add our farm mechanics ) scratching our heads for ideas ( though if the truth be known our farm mechanics only gave it a cursory glance partly because they're busy, but more likely because they detest working on anything that does run preferably run diesel &/or have 4cyl's +)

    In the end I took it to a Husky dealer & ...... it was a tiny leak in the head gasket that only opened up enough to cause drama when hot - Thanks again for all the input.

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