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Thread: kfx400 piston compression

  1. #1
    Join Date
    Jul 2006
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    kfx400 piston compression

    i have a stock kfx400 except for a yoshi slip-on

    i want to know how good a Wiseco Piston with 12.2.1 compression will be
    and will i notice a significant power increase

    its fairly cheap 10$

    Thanks,
    Clayton
    Last edited by MRPoopie; 11-02-2006 at 04:44 PM.

  2. #2
    3leggeddog's Avatar
    3leggeddog is offline The sun shines on a dogs ass every now and then Got the holeshot
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    well i think,not 100% but your stock piston is already 12:1.you probally will only notice it reving quicker,as the wiesco should be a lighter piston.i know my zuk is 12:1 stock,so i assume the kfx is the same.
    Full Walsh CRF 450 hybrid 250r

  3. #3
    Join Date
    Jul 2006
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    miami florida
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    QuadSport Z400 Specifications

    * Engine: 398cc, 4-stroke, four-cylinder, liquid-cooled, DOHC, 4-valve, TSCC
    * Bore & Stroke: 90.0 x 62.6mm
    * Compression Ratio: 11.3:1

    took me awhile to find that

  4. #4
    3leggeddog's Avatar
    3leggeddog is offline The sun shines on a dogs ass every now and then Got the holeshot
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    hmm,my tech guy told me the next step up was 13.5:1,he said stock was 12:1.well,i dunno bud.if it's cheap,go for it.
    Full Walsh CRF 450 hybrid 250r

  5. #5
    conig is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    you can also do the base gasket mod its pretty easy.
    1983 honda 70atc, als,ot done, need throttle cable and assembly. PM me if you have this.

    1985 honda es 250 big red.
    85 percent restore. 10x10 douglas 190's 22-11-10 at 489's. 12x7 itp c series 24-8-12 swamp fox. some accent painting. snorkel everything and a custom PCV system. moose air filter. cobra utility exhaust. 2.5 um wheel spacers.
    A trike to show up the modern utilitys


    2002 scrambler 400 2x4 uni pod filter, lots of weight shaving, v force reeds, HPD race pipe, 39mm pwk or 34mm, 12-1 head, trail porting, custom clutching, hole shots on t-9s +1 all around. works shocks . trail bike with drag tweeks.

  6. #6
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    Jul 2006
    Location
    miami florida
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    whats the base gasket mod?

    Clayton

  7. #7
    conig is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    theres two different mods, one is to run a drz400 base gasket which brings you to the compression limit of pump gas, or the stock base gasket is three gaskets riveted together. you remove the gasket remove the rivits and just use the middle gasket. it takes 20thousands out of the gasket thickness. its the same as the drz gasket and I beleive the drz gasket is only like 50.00 so you might as well just buy the gasket imo.
    1983 honda 70atc, als,ot done, need throttle cable and assembly. PM me if you have this.

    1985 honda es 250 big red.
    85 percent restore. 10x10 douglas 190's 22-11-10 at 489's. 12x7 itp c series 24-8-12 swamp fox. some accent painting. snorkel everything and a custom PCV system. moose air filter. cobra utility exhaust. 2.5 um wheel spacers.
    A trike to show up the modern utilitys


    2002 scrambler 400 2x4 uni pod filter, lots of weight shaving, v force reeds, HPD race pipe, 39mm pwk or 34mm, 12-1 head, trail porting, custom clutching, hole shots on t-9s +1 all around. works shocks . trail bike with drag tweeks.

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