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Old 08-10-2013, 10:50 AM   #1
rusty43 OP
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Joined: May 2006
Location: Farmington, B.C.
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Question how to identify carb needles

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?
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Old 08-10-2013, 12:05 PM   #2
Orangecicle
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Stock are longer and have less obvious taper transitions.
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Old 08-10-2013, 12:17 PM   #3
MortimerSickle
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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.
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Old 08-10-2013, 12:17 PM   #4
rusty43 OP
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ok, the ones with the markings on them are longer. thanks
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Old 08-10-2013, 02:10 PM   #5
Orangecicle
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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.
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Old 08-11-2013, 02:34 PM   #6
Sporting Wood
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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.
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Old 08-11-2013, 08:29 PM   #7
Head2Wind
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the needles with the letters on them are the stockers.
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Old 08-12-2013, 04:35 PM   #8
Zuber
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SOLD - I've got some TI Factory Pro needles sitting around. Make offer.

Free shipping... funny, right?
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Zuber screwed with this post 08-12-2013 at 04:55 PM
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Old 08-15-2013, 11:52 AM   #9
Sporting Wood
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I'll buy all the Factory Pro needles ya'll have for sale.
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