Push Pull Cable

Discussion in 'The Perfect Line and Other Riding Myths' started by toates89, Apr 25, 2014.

  1. toates89

    toates89 Been here awhile

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    I have a dr350 and the throttle wont close while off and will while running. After pulling the cables i notice the push cable creates just enough friction to cause me some issues.

    Ive read that many just remove it. I was wondering does anyone disconnect and leave it there incase their original cable snaps they could re route the push to be a secondary pull cable?
    #1
  2. Dolly Sod

    Dolly Sod Red Clay Halo

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    Sometimes too much tension between the two cables can cause an issue. Try putting a little slack into the close cable and see if it helps.
    #2
  3. ttpete

    ttpete Rectum Non Bustibus

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    It's all too easy to create a binding condition by misadjusting the cables. Both cables pull, there's no pushing involved.

    Start by slacking off the closing cable. Then adjust the opening cable so there's minimal slack when opening the throttle. Now, adjust the closing cable so there's just a little slack in it. That way, neither cable interferes with the other. The only reason the closing cable is there is to provide positive throttle closure in case a return spring fails or something binds up. Otherwise, it serves no function and just goes along for the ride.
    #3
  4. JohnCW

    JohnCW Long timer

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    Before you consider whether to disconnect it or fix it so it works properly, ask yourself why the original manufacturer put it there in the first place. Was it:

    (a) he had an excess number of cables in stock so needed to use em up,
    (b) was being considerate by supplying a spare.
    (c) thought 2 cables looked cooler than one.
    (d) fitted it as a safety device to pull the throttle shut in the slim chance the return spring snapped or opening cable jammed.
    #4
  5. Hesaid

    Hesaid Long timer

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    It's "C" isn't it?

    What do I win?

    MV
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  6. ER70S-2

    ER70S-2 Long timer

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    :nod Pull open, pull closed.

    +1
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  7. REALGRAVEROBBER

    REALGRAVEROBBER LEAVING GRAVES EMPTY

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    In my humble opinion, I have found:

    Keeping things very close to stock causes LESS problems.

    Maybe you adjust your fuel idle mixture, get the carb changed for your altitude, but overall KISS (Keep It Simple Sweetheart).

    The previous posters are right on about been careful to make some slack between the cables to they are not binding the assembly. I've also had good luck with taking the whole throttle assembly apart and wash it in hot soapy water (dishwashing soap works well). Clean plastic is slippery.

    Also, worn-out throttle cables will have some drag in them as the plastic liner-friction bushings wear out and the cables rub against metal at some internal aspect. Sometimes new (or less used, ie from eBay used) will cure the sticking or dragging throttle. I've fixed a few bikes that wouldn't allow the throttle to return unless the handlebars were turned just so and the throttle would snap back closed ... due to the throttle cables being worn out and friction happening inside the cable liners at certain angles.

    After a lot of hours trying to fix a lot of my own and customers bikes ...

    that is my $0.02 :)
    #7
  8. dovetailredux

    dovetailredux Adventurer

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    You might also try lubing the cables.
    #8
  9. markk53

    markk53 jack of all trades...

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    I've often wondered if they felt it wasn't needed on all those two strokes why was it suddenly needed on all the four strokes? I haven't removed either of mine, but it does make one curious. Even the ATVs with the thumb throttles on virtually the same bikes use one cable on slide and CV carbs.

    Just makes you wonder... Of course if you did have the throttle kind of jam or want to stick open the pull-return will definitely be of value, should that "lightning strike" happen.
    #9
  10. Dolly Sod

    Dolly Sod Red Clay Halo

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    My brother had the throttle stick open on his Ducati monster. The internal sheathing of his cable pulled out and wedged itself in the throttle mechanism. He was doing a track day at the time and got stuck at WFO. Bit of a pucker moment to pull the clutch and find the kill switch.

    Bet he wished his duc was equipped with a pull to close cable. :rofl
    #10
  11. lnewqban

    lnewqban Ninjetter

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    Bowden cables can cease to function smoothly, particularly if water or contaminants get into the housing.
    Unless one (or both) of the cables is fraying, proper service (cleaning plus lubrication) will reduce excessive friction between:

    1) Cables and housings.
    2) Right handle and handlebar.
    3) Butterfly valve's pivot and bushings.
    #11
  12. markk53

    markk53 jack of all trades...

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    Bowden what? I'm sorry, that's too in-depth for understanding on the ADVrider forum... You will have to dumb it down more...

    :johntm:dunno:scratch:csm:up:dic:patch:doh:snore
    :confused:puke2:hmmmmm:jjen:jump:jkam:lurk:tb
    #12
  13. JohnCW

    JohnCW Long timer

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    You might have time to reach for a kill switch on the track and get away with just a big scare, but on the road with far more 'deadily' objects a stuck open throttle may have you in serious trouble way before our slow brains can figure what has happened and what do we need to do to deal with it.
    #13
  14. toates89

    toates89 Been here awhile

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    I am currently running one cable for now.
    #14
  15. markk53

    markk53 jack of all trades...

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    Or get their gas pedal unstuck from the floor mat...
    #15
  16. snarf

    snarf WFO and clueless

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    You guys are mistaken if you think the push cable will be able to overpower the pull cable, in the event of a cable jamming up. That's not what it was designed for.

    Ever ridden a 500 two stroke? The can surge on you when you chop the throttle shut. Surging is when the piston's pulling so much vacuum that it causes the slide to 'jump' [there's more to it than this, but its the basic idea] a little- and that causes the bike to give you a little extra boost- even if you didn't ask for it :)

    The push/pull throttle is something made up to try and sidestep this, because big thumpers create a lot of vacuum, too.

    Usually, the push/pull cables are NOT the same, so the idea of having it as a spare, while a good idea on paper, wont do anything for you in the real world.

    Some of my 450s I've removed the push cable, some not. I like pulling the push cable,a s it makes the throttle lighter overall, and there's less parts to fail.

    YMMV.
    #16
  17. JohnCW

    JohnCW Long timer

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    Virtually all modern motorcycles prior to FI use a CV type carburetor and a push/pull cable system. In a CV carburetor there is no physical connection whatsoever between the slide and the opening/closing throttle cables, none, zero. The cables attach to and control the opening/closing of the butterfly valve. The slide is not physically connected to the cables in any way and is designed to move completely freely and independent in response to changes in manifold vacuum.

    The push/pull cable system is there solely to provide positive control over the opening/closing of the butterfly valve in the event the return spring is unable to close it (return spring failure or sticky pull cable). Properly routed and lubricated push/pull cables should have little friction. Most of the tension felt at the throttle is due to the return spring and throttle body or butterfly springs, so removing the second cable on a properly working system should result in virtually no describable change to the weight or action at the throttle grip.
    #17
  18. Dolly Sod

    Dolly Sod Red Clay Halo

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    My KTM 640 ADV with CV carb and my Vstrom 640 with fuel injection both have pull to close cables.
    #18
  19. ttpete

    ttpete Rectum Non Bustibus

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    This. There's NO "push" involved. Pull to open, pull to close.
    #19
  20. snarf

    snarf WFO and clueless

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    Err.. virtually all? lol.

    Seriously dude, did you even read my post before you copy/pasted out of your clymers?

    I'm not talking about EPA and federally regulated throttle bodies, or CV [vacuum slide] carbs. I love how as soon as someone with real world experience posts up, the peanut gallery chimes in. :lol3
    #20