World’s Fastest Street Legal Harley-Davidson

Before last week Bonneville BUB’s Speed Trials this bike was legally ridden on the street and now it is claimed by Hiro Koiso Racing as “the World’s Fastest Street Legal Harley-Davidson”. Hiro is the engine builder/tuner at Red Rock Harley-Davidson in Las Vegas NV. After one year of recovery (both bike and him) following an accident on during the 2010 edition, Hiro was back on The salts, managing to make 15 passes during the week, srtting 2 new FIM World Records and 4 AMA National Records in the 3000 Blown Class, including a run at 193.596 mph without fairing!

His 2006 Harley FXD-I is powered by a JIMS 131″ Twin Cam engine modified by T-Man Performance. All internal components are WPC metal surface treated. Air is forced fed through ProCharger to add boost in speed. Engine power is held by AIM 3rd generation CF2 clutch. Gear shifting is done by Pingel electric shifter. Engine boasts 224 Horsepower at rear wheel, transmitted with Sundance/RK chain. “This year’s preparation was tough but it was all worth it.” Hiro commented. Red Rock Harley-Davidson.

13 Responses to “World’s Fastest Street Legal Harley-Davidson”

  1. 1 JPEREZ Sep 6th, 2011 at 10:36 am

    I worked with Hiro back in ´07, got to see most of his build, great to see him succeed!! all the best from Honduras Hiro!!

  2. 2 Larry R Sep 6th, 2011 at 12:12 pm

    Kudos Hiro!

  3. 3 Brian Sep 6th, 2011 at 12:40 pm

    Can it be considered a street legal Harley? Not sure. Anyway, congrats.

  4. 4 Boss Hawg Sep 6th, 2011 at 2:55 pm


  5. 5 Kustoms and Choppers Sep 6th, 2011 at 8:08 pm

    WOW nice Harley!

  6. 6 David Sep 6th, 2011 at 11:22 pm

    Street legal? does that mean it has tags and inspection or what? Is it like a bike that on the show room floor???? Street legal?

    SSDD; David

  7. 7 Markus Saegesser Sep 7th, 2011 at 3:39 am

    Hi Hiro
    Congratulations to your great success in 2011, hopefully we see each other soon again.
    Kind regards, Markus

  8. 8 A 1 CYCLES Sep 7th, 2011 at 8:31 am

    tail light , headlight, tag, treaded tires, a couple gallons of fuel and self starting= street bike..awesome power and congrats! im coming out with mine next year! goal is 200 club with a fairing….stay tuned..but congrats 193 unfaired is amazing stuff. you think your cheeks flutter at 70 mph on the highway! lol

  9. 9 mcyclhound Sep 7th, 2011 at 10:17 am

    Hey,where’s the apes and highway pegs? Seriously- Cool Ride

  10. 10 Spaz Sep 7th, 2011 at 12:04 pm

    that’s awesome, but I did notice that everything that makes it so fast and high performance is NOT a harley part… just sayin’

  11. 11 rags Sep 7th, 2011 at 4:08 pm

    congrats.193 without a fairing awesome

  12. 12 bigalyts Sep 8th, 2011 at 10:28 am

    Keep recovering, and best of health to you Hiro. I

  13. 13 cwglide Sep 8th, 2011 at 7:54 pm

    That is something to be proud of Hiro, 193 mph without fairing!!! 224 HP!!<,,,,,dang!! What a brute,,,,congrats to you and your team for pulling this off. I'm impressed!

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Cyril Huze