Keihin 39/41FCR KIT for KTM 950

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by RibRoy, Sep 22, 2013.

  1. RibRoy

    RibRoy RibRoy

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    Hi, Tried to search the forum for some info about Keihin 39/41FCR KIT for KTM 950, but no luck.
    Does anyone have these? Pros/cons/effect? Hi have Rotweiler filter and jetted my SE already, but more power is never wrong.
    #1
  2. Dustodust

    Dustodust Long timer

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    I had FCR 41's on my 950 adv for over a year
    they are extremely FUN !
    I built a heat resistant carbon fiber baffled cold air intake filter box for them
    The carbs make a lot of noise and the CA box controled the sound and they sounded awesome , similar to a ducati sound and like a big V8 hum under hard accel
    The advantage is not in horsepower
    but the increase in raw TORQUE and throttle response is unmeasurable and hard to explain
    like the difference between riding a pony and a mad cheetah
    twist the throttle in third gear and the front end starts climbing off the ground without a bump up or anything
    awesome mod for a modest $1500 investment !
    makes it feel like a whole different bike, like a hot rod version of the LC8

    downsides :
    NO CHOKE :
    this is a biggie and the dealbreaker for me after suffering with unreliable starting for over a year, I sold the carbs for a decent price , I would like to choke SUDCO for this bonehead move of not including a choke. If the carbs had a choke I would still have them today. may not be an issue if you live and keep it at sea level in a warm southern location, small loops out of the garage, but I lived in the mountains and ride a lot of remote places solo, wake up from a tent with frost on the seat and you are screwed, I dont want ANY unreliability issues.
    CRAPPY AIR FILTER PODS:
    this is not a big deal but the pods make it noisy as heck, and vulnerable to water, the C.A.I. box I built made it manageable
    there are now some new options for filters but at the time all we had was the crappy pods
    #2
  3. RibRoy

    RibRoy RibRoy

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    Hi and thanks for your reply. Living in Norway means I need choke. To bad they didnt fitted it with a choke, seems like a perfect mod.
    #3
  4. avc8130

    avc8130 Long timer

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    I've never had the FCRs on a KTM 950 or 990, but I have had them on an SV650.

    The carbs were AWESOME. LOVED them.

    BUT: NO CHOKE!

    I live in NJ and ride all year long. I could USUALLY get the bike started down to 30F in the winter. The accelerator pumps would let me squirt some raw fuel before trying to start. There was more than once that I resorted to a hair dryer to get the bike started in the morning.

    If the temps were above ~45F it wasn't a very big deal.

    Fuel economy SUCKED too.

    ac
    #4
  5. Alti Tude

    Alti Tude Been here awhile

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    I've been considering some FCRs on my 950 EX, I have both some 41s and 39s here I could use. Cant decide if I really want to. I'd love the power but don't want to loose fuel mileage. Still cant decide. I have FCRs on one of my Laverdas though and love them. They are I think the best motorcycle carb you can get but yeah, the lack of a choke can be a hassle. Not too much trouble on the Laverda as it never goes out in cold nasty weather but the KTM does. Cosentino Engineering offers some KTM/FCR stuff and mentions on his web site that he can do a choke system for them. I don't know what he does but here's a link:

    http://cosentino-engineering.myshopify.com/collections/all

    And on the lack of a choke, Dusttodust, don't be mad at SUDCO, it ain't their fault. Keihin designed the FCR downdrafts as a pure race carb and didn't include a choke assembly. Its not something SUDCO had anything at all to do with. There are a few sizes of side draft FCRs that are available with a choke system but they wont work on our KTMs.
    #5
  6. Lorretto

    Lorretto City Dweller Crushperado

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    #6
  7. Sumi

    Sumi Long timer

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  8. Country Doc

    Country Doc Wanderer

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    My 950 is set up with the FCR 39's and the cosentino engineering velocity stacks, jetted appropriately. There's so much motor and throttle response it's insane. Really insane.

    I was really worried the lack of choke was going to be a major issue. The ride I just did in Quebec got quite cold and wet at night, with temperatures around 5-8 degrees celsius in the morning.

    It was no problem at all to start the bike. Once I had to hit the starter again after it fired initially then died, but the other three days (which were all cold/wet), it fired up easily, idled, warmed, no problem.

    I have not tried to start it in sub-zero conditions yet, however.

    I was very surprised by how easy it was. I remember this bike being much more difficult to start with just the Sudco kit (without the Cosentino setup), when the previous owner had it first converted.

    Fuel economy was a steady 38mpg, all mixed conditions - highway 75mph cruising, dirt, singletrack, etc.

    dc
    #8
  9. RibRoy

    RibRoy RibRoy

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    #9
  10. RibRoy

    RibRoy RibRoy

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    Just ordered "The full monty", Anyone that have tried to fit Rottweiler on these?
    (I have this already)

    Thanks
    #10
  11. snowhawk jockey

    snowhawk jockey Slack Jaw Gaper

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    Good move!!
    Did you get the 41's? The full monty with stacks and big filters should set your hair on fire!!:eek1
    #11
  12. RibRoy

    RibRoy RibRoy

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    Nope, Went for the 39's :)

    "The 39's provide a slightly higher intake velocity and produces more torque and mid-range, they will work well for stock to modified engines. The 41's will flow better at higher RPM's and thus produce a little more HP at the sacrifice of some torque down low, they will work well with over-bored or highly modified engines"
    #12
  13. Alti Tude

    Alti Tude Been here awhile

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    I have the Rottweiler on my 950 and some spare FCRs sitting in the garage and have been wondering the same thing. I love that filter and don't want to loose it, so I'll be very interested to see how it all goes together on your bike. :)
    #13
  14. SpeedyR

    SpeedyR SE in the SE

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    interested here as well. i'm thinking a set of FCR's and a Rekluse would round out my SE as my perfect dual sport ride. :)

    I've had FCR's on V-twin race bikes but curious to hear the overall impressions and if you can keep the foam ITG filters with the system as well.
    #14
  15. RibRoy

    RibRoy RibRoy

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    At the moment I'm trying to connect Chris/CPR with Chris/Cosentino Engineering, to see if there is possible to do this.

    SpeedyR: I already got the Rekluse and Rottwieler filter/ CJdesign jetting. Works perfect, but more torque (FCR's) cant be wrong :)
    #15
  16. Sumi

    Sumi Long timer

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    Did you install it already? What are your thoughts?
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  17. RibRoy

    RibRoy RibRoy

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    Hi, It takes some time before the carbs are here in Norway. Install will be done during the winter. I'm also trying to get Rottweiler to make some arrangement that will make my RW fit the FCR's. Lot of people say the K&N are no good i dusty conditions. ( Have also seen this on a friends XT660 with K&N)
    Will post when its all fitted, but it want be until next summer.
    #17
  18. RibRoy

    RibRoy RibRoy

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    Just a test: If Rottweiler make a filter for FCR's and Cosentino Engineering will offer the "Full Monty" with this.
    How many of you would be interested in buying a kit?
    #18
  19. Sumi

    Sumi Long timer

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    Great.. I'm also considering this kit to get for myself as my christmas present, and also I am a little in doubt with the pod filters, but looks like they'll will do just fine if they're looked after..

    The Rottweiler filter would be great, but the kit is already so effin expensive, I'm not wanting to pump in another $2-300 for it:/
    #19
  20. mookymoo

    mookymoo Mookish Mook

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    You can rest easy regarding the expense of the the CPR filter, as it is unlikely to be physically possible to use it.

    The problem is how the cables are routed on the FCR carbs - i.e. vertically - they would interfere with a CPR-style filter.

    If you search through sakurama's thread, you will see Flanny and Gregor discussing it and reaching the same conclusion.
    #20