FCR 39 impression

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by sti_rx7, Jul 22, 2013.

  1. sti_rx7

    sti_rx7 Been here awhile

    Joined:
    Nov 26, 2005
    Oddometer:
    125
    I just installed the Sudco FCR39 kit for my '04 GO!!!!. I had an older KLR that I switched the CV carb for a FCR and remember what a huge difference it made in power and response. I thought that it should have a similar effect on my KTM. Was I RIGHT!!!!!!!!!. This thing is incredible I dont have the jetting fully sorted out and it is a bear to start but it just RIPS!!!. It feels like it has more grunt than my Concours 14. Money well spent. :clap
    #1
  2. 950smr

    950smr Adventurer

    Joined:
    Jul 20, 2013
    Oddometer:
    26
    always glad to see positive reports of the fcr's on a 950. im looking at doing 41's on mine soon
    #2
  3. tinwelp

    tinwelp Professional Idiot

    Joined:
    Dec 5, 2010
    Oddometer:
    308
    Location:
    Deepest Southern France
    Completely agree. Set up the TPS correctly and play with your idle jets and you'll get the starting sorted out too. A choke is the better solution, but although there are several excellent attempts out there (me included), nothing has worked quite as well as hoped. To be fair though, the weather dictates the amount of attention the subject gets, and as it's mid summer, starting from cold is simple.

    I expect you've followed Gregor's thread to get to this point??? If not, check it out: http://www.advrider.com/forums/showthread.php?p=21911846#post21911846

    Then go buy Chris's velocity stacks for even more fast... http://www.advrider.com/forums/showthread.php?t=834425

    Welcome to the FCR club!

    Cheers... Paul
    #3
  4. mousitsas

    mousitsas Long timer

    Joined:
    Oct 10, 2008
    Oddometer:
    3,560
    Location:
    Athens, Greece
    the more i read about fcr the more I like efi
    #4
  5. tinwelp

    tinwelp Professional Idiot

    Joined:
    Dec 5, 2010
    Oddometer:
    308
    Location:
    Deepest Southern France
    :D:D:D

    FCR vs. EFI? I think I'd go with EFI for ease of fueling and spark adjustment. They will be quite different animals of course, but if you want to stick with carbs (and a lot of people do, for lots of different reasons), the FCRs are a HUGE improvement over the stock CV carbs.

    Cheers... Paul
    #5
  6. mousitsas

    mousitsas Long timer

    Joined:
    Oct 10, 2008
    Oddometer:
    3,560
    Location:
    Athens, Greece
    I'm sure you're right on that one.
    I just know a few people who got rid of them because they never managed to get around their quirks. On your last sentence....I am wondering if the gap between a well sorted ITG filtered stock carb and the fcr is still that big.
    #6
  7. tinwelp

    tinwelp Professional Idiot

    Joined:
    Dec 5, 2010
    Oddometer:
    308
    Location:
    Deepest Southern France
    Yes it really is night and day different. Before I bought the FCRs I'd been along the road of improving the stock carbs. A jetting kit and a good filter was first, then lots of fiddling with the jetting to get it absolutely correct. It was much improved compared to when I bought the bike, but it was completely flat and fluffy compared to with the FCRs fitted. Yes they take a little work to set up well, but with perseverance they really make the 950 wake up! The most interesting point is now you can buy the carbs in a true plug-and-play kit from Chris Cosentino. No jet-fiddling or TPS mount-making or throttle return spring-weakening needed. Certainly the best modification I've made so far. I just wish Chris was selling his stuff before I bought mine from Sudco!

    As a added bonus, I've even managed to improve my gas mileage considerably, despite fitting a 16T front sprocket. 7l/100km is about the norm now for mixed riding on mountain roads (50/50 mix of pootling and banzai riding). A little better on the autoroute (mostly under 140kph... my licence is hurting!), a little worse on the track. I never managed anything much less than 10l/100km with the CV carbs after setting up.

    Cheers... Paul
    #7
  8. fast4d

    fast4d Long timer

    Joined:
    Jul 27, 2007
    Oddometer:
    2,830
    Location:
    Los Angeles, CA
    if I ever get another carbed bike it must have FCRs.

    CV carbs are the reason I went with FI.
    #8
  9. PowerCell

    PowerCell Manufacture

    Joined:
    Sep 28, 2005
    Oddometer:
    2,472
    Location:
    Southern Kalifornia

    Annnnnnnnnnnnnd....... you're welcome! :D



    .
    #9
  10. sti_rx7

    sti_rx7 Been here awhile

    Joined:
    Nov 26, 2005
    Oddometer:
    125
    I finally had a chance to fiddle with the air jets and now its a little easier to start but still does not like to idle immediately. Probably have to get a smaller main as the exhaust shoots out flames after letting off full throttle. COOL!!!!!!!!
    #10
  11. wpbarlow

    wpbarlow Long timer

    Joined:
    Jun 9, 2003
    Oddometer:
    14,445
    Location:
    Central NJ
    Make sure you get some night-time running video before you sort it :lol3

    Lots of people say that, but videos are scarce.
    #11
  12. Zuber

    Zuber Zoob

    Joined:
    Sep 28, 2004
    Oddometer:
    2,869
    Location:
    Main Street, Shedd, Oregon
    What's the relationship with 'GO!!!!' ownership and the use of punctuation!!!!!!
    #12
  13. sti_rx7

    sti_rx7 Been here awhile

    Joined:
    Nov 26, 2005
    Oddometer:
    125
    That's what the stickers on the tanks look like.
    #13
  14. triplenickel

    triplenickel Long timer

    Joined:
    Jul 9, 2008
    Oddometer:
    2,535
    Location:
    Campbell River, BC. Fantasy Island
    With regards to the cold starting has anyone tried a simple pump primer system like used on older Ski-doo's?

    [​IMG]
    #14
  15. Lupin 3rd

    Lupin 3rd Raygun Gothic

    Joined:
    Jul 9, 2009
    Oddometer:
    1,011
    Location:
    MoCo, MD
    Don't have a KTM (yet :evil) but on my 900 Duc, the FCR 41 are the best mod of all!

    EFI might be better at cold starts, but once the engine is warm it revs smoothly from 3000RPMs. Fuel mileage is better than with the Mikuni CV (50MPG vs 40) and the torque is just awesome! :D

    Unless it's below freezing, a twist of the idle knob helps with the cold starts and I give the engine a few minutes before giving it the beans, but then it's good. :deal
    #15
  16. ViperACR

    ViperACR Adventurer

    Joined:
    Nov 27, 2008
    Oddometer:
    23
    Location:
    North of Denver
    Is FI an option for the 950 SE? From some of the posts I can't tell and have been considering changing to the FCRs.
    #16
  17. Sumi

    Sumi Long timer

    Joined:
    Mar 30, 2010
    Oddometer:
    1,898
    Location:
    Hungary
    It's probably cheaper to go with FCRs.. Modding a carbed 950 into a FI would cost loads of money (ecu, wiring harness, throttle boddies, o2 sensors, exhaust mod to fit the lambda probes, etc..), not to mention the maps that are written for the 999.8ccm engine and cams instead of the 942ccm of the 950...(ofcourse ignore this if you have a 990 engine on the shelf to swap it out for your current engine:D) I'm not sure they would work perfectly on the 950 (they don't even work perfectly on the 990 - haha)

    So unless you have all the parts for a very reasonable money, I'd go with the FCRs, or just live with the CVs.. they aren't that bad at all:) (they were good enough to win the Dakar to say the least:))

    One more thing.. as the Adventure's wiring harness is very different from the SE's (fuses are under the seat, ECU, VR is in a different place, etc..) you would have to highly modificate the 990's harness, so you can fit the sensors, ecu, etc.. on your bike. But maybe an SD or SM harness would be closer to the SE.. Don't know..
    #17
  18. ViperACR

    ViperACR Adventurer

    Joined:
    Nov 27, 2008
    Oddometer:
    23
    Location:
    North of Denver
    FCR it is then, thanks for the info. I had some problems with my CV carbs on my last trip that were not acceptable. I live at 5000' elevation and just got my bike jetted the way it should be and then went riding up to 13,000', or at least tried to. It seemed that at about 10,000' and rough terrain the bike would start flooding out and would not stay running. This sounds weird but it is so, if we were on smooth dirt roads it ran fine with only the expected loss of power and responsiveness even at about 12,500'. But at about 10,000' if we were on rocks or rough trails it just would not stay running. Would the FCRs fix this as well?
    #18