how to identify carb needles

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by rusty43, Aug 10, 2013.

  1. rusty43

    rusty43 cruzincariboucountry

    Joined:
    May 25, 2006
    Oddometer:
    367
    Location:
    Farmington, B.C.
    when i bought my bike it came with a factory pro jet/needle kit included. i am installing h2w's prefilter jetting kit and i don't know which needles are in the carbs. the installed ones are longer, are marked with NDFL and have a sharper transition at the top than the ones in the fp kit box, which have no markings at all. which are the stock ones?
    #1
  2. Orangecicle

    Orangecicle On a "Quest"

    Joined:
    Apr 24, 2007
    Oddometer:
    4,106
    Location:
    West Des Moines, IA
    Stock are longer and have less obvious taper transitions.
    #2
  3. MortimerSickle

    MortimerSickle Semi-Adventurer

    Joined:
    Dec 1, 2005
    Oddometer:
    14,309
    Location:
    Rainville, Orygun, where moss is a road hazard.
    The Factory Pro needles I have are not marked at all. The blunt end has a shorter distance between the top groove, and the end than does the OEM needle.



    I am still trying to figure out which is the better needle for my application. :becca
    #3
  4. rusty43

    rusty43 cruzincariboucountry

    Joined:
    May 25, 2006
    Oddometer:
    367
    Location:
    Farmington, B.C.
    ok, the ones with the markings on them are longer. thanks
    #4
  5. Orangecicle

    Orangecicle On a "Quest"

    Joined:
    Apr 24, 2007
    Oddometer:
    4,106
    Location:
    West Des Moines, IA
    The stock needles give a smoother throttle response. The factory pro needles give the bike a more choppy throttle feel. For my riding, I like the smooth throttle feel, so I bought new stock needles to replace the FP stuff that came with my bike.
    #5
  6. Sporting Wood

    Sporting Wood I

    Joined:
    Oct 18, 2011
    Oddometer:
    902
    Location:
    Horneytown, NC
    The factory pro needles are titanium. Stock are stainless steel (iirc). Weigh them. The FP needles will come in about half as much as the stock needles.

    I have the opposite opinion as Orangecicle above. Stock needles are little taperless telephone poles, designed for low emissions and EPA approval at cruise rpm. Accelerate through the pit and the thing falls flat on its face. We've been concocting ways to eliminate this since the bike first came out. The entire prefilter/airjet deal was designed to beat the 4000 rpm hole and still sells even though it does so at both the cost of mpg and hp.

    Fwiw, I had a devil of a time getting the CVR carbs to run well with the Factory Pro kit...way back in 2006 I think. About 50+ times inside swapping this or that I finally realized the importance of float height. Factory Pro kits will run like absolute crap with the factory 3mm height. At 4mm or slightly less, the carb responds well to other adjustments.

    My point is, so many folks have bought the FP kit and been disappointed...mostly because these carbs are insanely finicky but also because FP's suggested starting point and directions suck, imo. However, the needles are the heat! Set them up right and you can have a far, FAR smoother throttle roll than stock needles. Its a massively huge difference in performance that's abundantly clear, especially when giving a quick twist of the throttle in the previous 4000 pit. This time it lofts the front wheel easily in 2nt and 3rd. I get 38-42 mpg too, can climb the highest peaks in Colorado along with all that beautiful smooth power.
    #6
  7. Head2Wind

    Head2Wind MotorcycleMayhem

    Joined:
    Mar 13, 2006
    Oddometer:
    2,662
    Location:
    NorthWet Washington
    the needles with the letters on them are the stockers.
    #7
  8. Zuber

    Zuber Zoob

    Joined:
    Sep 28, 2004
    Oddometer:
    2,631
    Location:
    Main Street, Shedd, Oregon
    SOLD - I've got some TI Factory Pro needles sitting around. Make offer.

    Free shipping... funny, right?
    #8
  9. Sporting Wood

    Sporting Wood I

    Joined:
    Oct 18, 2011
    Oddometer:
    902
    Location:
    Horneytown, NC
    I'll buy all the Factory Pro needles ya'll have for sale. :freaky
    #9