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Thread: 1986 atc350x

  1. #1
    Join Date
    Aug 2019
    Location
    Florida
    --
    5

    1986 atc350x

    Any suggestions for power ,, nothing to do with gearing and tires for speed ,, just suggestionss for power

  2. #2
    Join Date
    Apr 2014
    Location
    Edmond, KS
    --
    2,531
    The first thing to do would be changes to the intake and exhaust for better flow. Anything else without doing this will never see the full potential of the power parts.

  3. #3
    Join Date
    Aug 2019
    Location
    Florida
    --
    5
    Already cobra’d up dude

  4. #4
    Join Date
    Aug 2008
    Location
    devore,ca
    --
    1,015
    I run a 10.25 high compression piston in all my 350x's. I don't think it raises the HP much but it does have a noticeable increase in torque and they just run better. On a 4 stroke the HP gains are in the head, and costs a lot of money.
    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

  5. #5
    Join Date
    Apr 2012
    Location
    USA
    --
    4,114
    Wouldn't increasing torque have a byproduct of making more HP because more work can be done at the same rpm? I think I get what you're saying though, it doesn't rev faster with the higher compression piston vs stock right?

  6. #6
    Join Date
    Aug 2008
    Location
    devore,ca
    --
    1,015
    Ya, it's kinda a chicken or the egg thing. If you make more torque, you can change gearing to make it go faster. So yes they are related. It also allows you to go with bigger valves and cams because they will actually lower the compression and lose velocity of the intake causing the torque to drop back down a bit but allowing more fuel in to make more power. It's a vicious cycle.
    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

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