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Thread: 350x valve seals

  1. #1
    6bt's Avatar
    6bt is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Jan 2017
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    near Syracuse NY
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    267

    350x valve seals

    Just out of curiosity, can the valve seals be changed with the head on, or does it have to be removed, as the valves move too much? Mine smokes some after being stored upright for awhile.

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  2. #2
    Join Date
    Apr 2012
    Location
    MI, USA
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    2,322
    Not 100% sure of the design, but it's possible to do the job without pulling the head on most car engines, but you have to pressurize the cylinder to keep the valves from dropping down. It's basically just threads into the spark plug hole, and hooks up to an air compressor. You'd want the engine on the power stroke, at the very bottom of the stroke.

  3. #3
    Join Date
    Aug 2008
    Location
    devore,ca
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    828
    You would have to come up with a way to get the valve springs off and a way to keep the valves from dropping into the cyl. In reality it's not that much more work to just pull the head off.
    YAMAHA 450 HYBRID
    85 350X- RED
    85 350x -BLACK
    86 350x-WHITE (with Goki)
    85 250r
    83 atc 70
    84 atc 70
    84 atc 110
    09 yfz 450
    2006 Arctic Cat Prowler
    RZR XP 900

  4. #4
    Join Date
    Sep 2007
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    100mi west of Chicago
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    3,582
    Pull the head and while it's off you can inspect the valves and seats.

    Rob

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