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Thread: yfz450 big bores

  1. #1
    Guest

    yfz450 big bores

    i have a yfz with a 508 max power ice cube cylinder 11:1 compression, with stock porting on the head and stock carb with a sparks big core pipe, a prodesign pro flow kit and a gytr jet kit with the ncvq needle, could you give an estimate on hp with a properly jetted quad. i know you have probably been asked these questions a million time so don't get mad at me for asking i am just curious because i see all of these stock 450's with high compression pistons hitting 50 hp easily.

  2. #2
    Join Date
    Sep 2004
    Location
    Virginia
    Posts
    665
    I would say your close to 50 or just over it. I did a stock 05' yfz and with only a Rossier Eng. Pipe and dialed in I got 44 which is great. The reason I say close to 50 or just over is because the big bore kits add alot of Tq. The do give Hp but where they really shine is Tq. Where do you live?
    Precision Motorsports
    Mobile Dyno Services
    www.precision-ms.com
    ------------------------------

    My 440ex Mods: 12:5 Comp, White Bros. XC Cam, DRG Ported Head, DRG EXR Prototype Filter, Airbox Lid Off, 450r Carb, LRD Pro 4 Ballistic Full Exhaust...
    *Jetting: 3 turns out on the Mixture Screw, 48 pilot, Needle in the 3rd from top, and a DJ 170main*
    -----------------------------------------------
    Up to 42hp-30tq and For Sale*** Time for a new project!!

  3. #3
    Guest
    indiana, i also will be running this with knobbys, and tire balls

  4. #4
    Join Date
    Sep 2004
    Location
    Virginia
    Posts
    665
    I would still say close to 50
    Precision Motorsports
    Mobile Dyno Services
    www.precision-ms.com
    ------------------------------

    My 440ex Mods: 12:5 Comp, White Bros. XC Cam, DRG Ported Head, DRG EXR Prototype Filter, Airbox Lid Off, 450r Carb, LRD Pro 4 Ballistic Full Exhaust...
    *Jetting: 3 turns out on the Mixture Screw, 48 pilot, Needle in the 3rd from top, and a DJ 170main*
    -----------------------------------------------
    Up to 42hp-30tq and For Sale*** Time for a new project!!

  5. #5
    Guest
    what kind of torque should i see and what is an average torque number???

  6. #6
    Join Date
    Sep 2004
    Location
    Virginia
    Posts
    665
    sent you a pm
    Precision Motorsports
    Mobile Dyno Services
    www.precision-ms.com
    ------------------------------

    My 440ex Mods: 12:5 Comp, White Bros. XC Cam, DRG Ported Head, DRG EXR Prototype Filter, Airbox Lid Off, 450r Carb, LRD Pro 4 Ballistic Full Exhaust...
    *Jetting: 3 turns out on the Mixture Screw, 48 pilot, Needle in the 3rd from top, and a DJ 170main*
    -----------------------------------------------
    Up to 42hp-30tq and For Sale*** Time for a new project!!

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