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Thread: 421cc 4mm Stroker Banshee on Pump Gas

  1. 02-28-2007, 04:34 AM #1
    Mobile Dyno's Avatar
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    421cc 4mm Stroker Banshee on Pump Gas

    Her is a banshee that we did. It had:


    Trinity 400 Cub Cylinders
    Trinity 4mil stroke
    Trinity 35mm Carbs
    Trinity STG 4 pipes
    Dynatek Box
    16t From Sprocket
    K&N Filter
    Pump Gas
    All New bearings and seal.
    +6 Swingarm

    This whole motor has been redone from bottom to top. New Everything. It came stright from the Yammy dealer to the dyno with no run time. We broke it in on the dyno.

    Here is what we did after alittle tuning..
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    ------------------------------

    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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  2. 02-28-2007, 04:35 AM #2
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    ------------------------------

    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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  3. 02-28-2007, 04:38 AM #3
    Mobile Dyno's Avatar
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    Attached Images Attached Images
    Precision Motorsports
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    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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  4. 02-28-2007, 04:39 AM #4
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    ------------------------------

    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!!
    Reply With Quote Reply With Quote
  5. 02-28-2007, 04:41 AM #5
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    Here is the A/F Graph.

    Blue = 150 main

    Red = 130 main

    Needles in the 3rd
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    Precision Motorsports
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    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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  6. 02-28-2007, 04:46 AM #6
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    firefighterjosh is offline King Quad Racer
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    Those are some imppressive numbers for pump gas.
    V-Twin King Quad
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  7. 03-01-2007, 09:23 AM #7
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    awsome to see a big bore banshe eon here...just under 100 hp...not bad on pump gas! and a set of 210 cc jugs
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  8. 03-31-2007, 08:12 AM #8
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    pro-rider46 is offline Pro Rider Steve
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    i bet if you run race gas you will easily get 100hp

    give that a shot
    Trx 450R - BACK IN ACTION!!!

    *2005 CRF450R*
    Pro-Action Suspension
    Pro-Circuit Ti-4 Full System
    Acerbis Hand Guards
    Hot Cam Stage 2
    Hotrods Crank
    JE 12.5:1 Piston

    2000 Mustang GT
    WAY too much to list, and still too slow
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  9. 03-31-2007, 01:44 PM #9
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    blasterfreak99
    blasterfreak99 is offline Bada** Blaster
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    i hope that guy is not plannin on runnin that on a motocross track but it looks like it cuz of the front tires
    '07 450ER:
    white brothers xc bumper, prm swinger skid, jetted, baffle removed

    '98 Yamaha Blaster:
    Airsal firebreather 240 kit, Vitos 3mm stroker crank, Project blaster aluminum airbox, Project blaster intake, Keihin 35mm airstriker carb, Vitos timing degree key, Boyeson pro series reeds, F7 pipe and silencer, Uni air filter, Durablue +2 axle (stock now i broke it), Kenda Klaw rear tires, Douglas .190 rear wheels (now stock i bent them), oil injection block off kit, EBC heavy duty clutch kit, 13/38 gearing, billet clutch basket, lightened flywheel, Renthal works chain, Fly handlebars, Hellbound +3 swinger, nissin hydro brake kit, banshee front shocks (stock now i bent them) , works quadstar rear shock w/rezzie, DG National front bumper

    coming soon:
    Maier race cut fenders
    Elka/Leager a arm and shock kit
    DG national series grab bar
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  10. 03-31-2007, 05:08 PM #10
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    id love to have that banshee! looks like a sweet ride!
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