Become a supporter to remove this ad

User Tag List

+ Reply to Thread
Results 1 to 14 of 14

Thread: Why dual throttle cables?

  1. #1
    Member Uncle Flash's Avatar
    Join Date
    Nov 2008
    Location
    Way Out West
    Motorbike
    Awesome Italian Scooter & Awesome Italian Motorcycle & Awesome Italian Bicycle
    Liked
    17 times
    Posts
    1,989

    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Why dual throttle cables?

    Can anyone tell me why the Keihin FCR carbs on my Ducati 900SS require the dual, push-pull cable system?
    Please, call me Flash...

  2. #2
    Member
    Join Date
    Apr 2008
    Liked
    84 times
    Posts
    4,323
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    in case the spring breaks

  3. #3
    Member Uncle Flash's Avatar
    Join Date
    Nov 2008
    Location
    Way Out West
    Motorbike
    Awesome Italian Scooter & Awesome Italian Motorcycle & Awesome Italian Bicycle
    Liked
    17 times
    Posts
    1,989

    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Flatslides are probably better than some carbs mounted on the side of the engine as the heavy slide mechanism could probably close itself off if the spring broke. If it is as simple as a back up for the spring, why don't all carbs use the system?
    Please, call me Flash...

  4. #4
    Member BERT's Avatar
    Join Date
    Nov 2005
    Location
    Dianella
    Motorbike
    Ducati Paul Smart 1000, Kawasaki KR1S,
    Liked
    16 times
    Posts
    2,458

    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    My Guess

    Pull - pull cables are used so a lighter return spring can be utilised and you get a positive action in both directions.
    A bit like a desmo throttle cable I suppose.

    Bert
    It's better to be thought stupid than open your mouth and remove all doubt

    Pure speed in sixth gear on a 5,000 foot straightaway is one thing, but pure speed in third gear on a gravel-strewn, downhill, ess turn is quite another.
    Hunter S. Thompson

  5. #5
    Member Magilla's Avatar
    Join Date
    Jul 2008
    Location
    Alice Springs, NT
    Motorbike
    CABS '09 CBR600RR
    Liked
    4 times
    Posts
    4,217

    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    My CBR600RR has dual cables as well.
    '====
    //`
    -Magilla
    Putting a fresh install of Windows on the internet is like giving a nymphomaniac a job at an STD clinic and then slipping viagra into their coffee. It may seem like a good idea at the time, but trust me, it isn't.
    R class test passed - Eligible to shadow R-E 26/05/13, R 26/05/14

  6. #6
    Member
    Join Date
    Apr 2008
    Liked
    84 times
    Posts
    4,323
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    you answered your own question If the spring breaks on the freeway the slides will 'probably' close... that or you'll keep going till you run out of gas or hit something like a car or preferably the kill switch. I assumed they were a design standard that came in yers ago.

  7. #7
    Member Sumfun4me's Avatar
    Join Date
    Mar 2008
    Location
    Southern River
    Motorbike
    Ducati 1198S Corse
    Liked
    1 times
    Posts
    1,105

    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Bert's explanation sounds about right to me. It's probably got something to do with limiting the stress on your wrist.
    __________________________________________
    To err is human.
    To arr is pirate.

  8. #8
    MIK
    MIK is offline
    Member MIK's Avatar
    Join Date
    May 2008
    Location
    kalamunda
    Motorbike
    Yamaha FZ1S,Norton Commando, WR450F, YZ250
    Liked
    0 times
    Posts
    155
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I pretty sure it a requirement for new road bikes to have this maybe not here but the US. Its a safety thing, although it also increases responsiveness.

    CAMS also a requirement for carby'd cars to run two.

  9. #9
    Member MattyA's Avatar
    Join Date
    Jul 2008
    Location
    Cuttin Ya Grass With Ma Bike
    Motorbike
    FZ6n & '78' TY175 Resto
    Liked
    0 times
    Posts
    2,735
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    4 strokes give you power where you want it. 2 strokes are more on off power .
    Thats what i figured for dirt bikes anyway
    IM ALWAYS ON THE EDGE, ITS ONLY THE SHARPNESS THAT VARYS

  10. #10
    Member ranmar850's Avatar
    Join Date
    Jul 2007
    Location
    Kalbarri
    Motorbike
    ZRX1200R, X1 White Lightning, 06 FJR 1300, Norton Commando
    Liked
    11 times
    Posts
    1,717
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You may find it has been a legislative requirement for quite some time, in the interests of safety.
    " Lightly Seared On The Reality Grill"

  11. #11
    Member Nudge's Avatar
    Join Date
    Mar 2009
    Location
    Forrestfield
    Motorbike
    Suzuki Bandit 600S, VFR750, GPX750R, TS250X, DR250R
    Liked
    0 times
    Posts
    304
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by MattyA View Post
    4 strokes give you power where you want it. 2 strokes are more on off power .
    Thats what i figured for dirt bikes anyway
    I thought I might have had an answer until I read this. What was the question again?

  12. #12
    Member gengo's Avatar
    Join Date
    Apr 2009
    Location
    Sydney
    Motorbike
    zx6r
    Liked
    0 times
    Posts
    150
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    its the decellaration cable and accelaration cable my new klx250 has it also and thats what it is stated as in manual, sort of like a safety to ensure throttle dont jam and go flat out in case of emergency

  13. #13
    Member PaulMac's Avatar
    Join Date
    Nov 2008
    Location
    Carvin' the trails
    Motorbike
    ZX9R, CR125 02, KTM125EXC 09
    Liked
    1 times
    Posts
    676
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    I have read that under some engine conditions (such as a backfire back up the inlet side) that the spring alone will not close the throttle slides down so the push cable is a safety thing to ensure that throttle closes when you expect it to and under all conditions. 2 strokes don't generally have a push/pull throttle system as they don't usually have problems that the 4 strokes do. It'd also why 4 strokes sometimes have backfire screens in front of the air filter - to stop it catching on fire in the event a a backfire into the airbox. Fun hey!
    Paul

    Stuff the four strokes. I'm waiting for the two stroke renaissance.


  14. #14
    Member Nero Diablo's Avatar
    Join Date
    Oct 2004
    Location
    Out there
    Liked
    9 times
    Posts
    6,161

    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Think it might have more to do with CV carbs than flatslide's, which you ducati has OEM. The flatslides are probally set up to run the OEM system for ease of installation, My goose runs twin cables but they are both pull, one fo each carb this was the same arrangment with delorto's bike is a mids 90's design same as the ducati so it would have had to meet the same legislation.

+ Reply to Thread

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts

Content Relevant URLs by vBSEO 3.6.0