Lucky Ducky

Discussion in 'General Questions' started by Fabian, Dec 12, 2013.

  1. Fabian

    Fabian Well-Known Member

    Just playing around with the NT carburettor to do back to back comparisons with my previously installed diaphragm carburettor.

    All ready to get the show on the road and head to my favourite "dyno hill", but when opening the throttle i found nothing more than a handful of idle.
    Didn't take me long to work out that the throttle cable had broken, and then the sense of fear that streams through a mans body when he prays to Chr*st that the cable broke at the throttle tube and not the carburettor slide. Making matters even more concerning is that a freshly rebuilt engine had been assembled and installed the day before with all the care and diligence of a Red Bull Formula 1 team mechanic.

    When i realised that the throttle tube end of the cable was intact i really started to soil my undergarments because of obvious consequences i.e. a solid piece of metal sucked through a brand new engine.

    It must have been my lucky day when i lifted the carburettor slide out of the carburettor body to find the cable end sitting on the venturi floor.

    This is the first throttle cable (in many) that has broken off at the carburettor end. Typically i get 6,000 kilometers (approx 3,700 miles) out of a throttle cable before it breaks at the twist point of the throttle tube.

    I guess today was my lucky day because it could have become real messy at wide open throttle with a cable end going through the engine.
    This situation is another example of the benefits of a diaphragm carburettor over a float style carburettor, because the cable inner is on the outside instead of the inside.

    [​IMG]
     
    Last edited: Dec 12, 2013

  2. grinningremlin

    grinningremlin Active Member

    Wow, ya learn something new everyday.That's a problem that I've never considered.It would've made some neat noises and neater internal embossing before something seized.Also, I gotta get a new camera, mine can't do those type shots for d**k.
     
  3. Fabian

    Fabian Well-Known Member

    Photo was taken using a Samsung Galaxy S4 Camera Phone, but my old Galaxy S2 Camera Phone had proper macro settings which made it much easier to get fast focus for close in shots.
     
  4. jaguar

    jaguar Well-Known Member

    I have never seen that before.
    maybe your throttle allows more pull than there is slide movement
     
  5. Fabian

    Fabian Well-Known Member

    I am a professional when it comes to pulling the throttle, typically being a hard and fast action, and my throttle is always adjusted to perfection with the perfect amount of pull for slide movement; a fostered action that has worked equally well in my relationships, so i am not changing a perfected technique based on something you have never seen before.

    Maybe you should spend more time engaging in recreational activity; in a consensual manner with your throttle slide...
     
  6. jaguar

    jaguar Well-Known Member

    ha! you are too funny Fabian.
    I was just saying that if the throttle pull exceeds the avaialable movement of the slide that then there would be suficient tension (at full throttle) to put stress on the cable till it breaks at the weakest spot.
     
  7. grinningremlin

    grinningremlin Active Member

    But, the surgical replacement when "that" cable end comes off is,... well I don't want to see the pics.
     
  8. Fabian

    Fabian Well-Known Member

    I do have a dry sense of humor, but not everyone sees it like it is, especially some of my ex-girlfriends when trying to explain that they used to be tighter than a new ring package, furthermore i had no idea who this unknown person by the name of "Jennifer" was, even though she popped up in my phone leaving many messages, offering to provide a better piston to wall seal than my current package.

    I have no idea why women over react so badly when going through my phone messages and encountering a new name; offering improved product support.
     
    Last edited: Dec 13, 2013
  9. Fabian

    Fabian Well-Known Member

    Crikey, i need the moderators to give me a swift kick up the backside to get the thread i created back on topic after i took a wrong left turn at Albuquerque.

    Back on top,,,,, i mean back on topic we must go!
     
  10. Fabian

    Fabian Well-Known Member

    @ grinningremlin

    All i can say is that had the cable nipple gone through the engine, it would have machined the bore to include a mini boost-port, that went all the way to the cylinder head.
     
  11. grinningremlin

    grinningremlin Active Member

    Though I doubt a walbro is built the same, it's still good info to have.This is such a little forum that some off topic humor keeps it fun.I will say you're lucky (as am I) the moderator ain't a a chick.
     
  12. Fabian

    Fabian Well-Known Member

    If the any of the moderators were a woman, i'd have my tabernacles mercilessly cut with a blunt instrument, particularly if she went through my phone messages.

    The Walbro style diaphragm carburettor is definitely a good thing, in part that they don't leak fuel and adjusting the fuel mixture is a 2 second job, not to mention that the throttle cable and actuation mechanism are externally located.
     
  13. HeadSmess

    HeadSmess Well-Known Member

    the brass ones do damage, the lead/zinc one just vaporise :)

    thats been my experience so far...

    but as for piston to cylinder clearance... yep. has to remain within serviceable limits or its on the phone chasing up new parts!

    all i can say...i still have the same throttle cables on certain bikes after 250,000km... i rarely purchase new ones on a build, and just scavenge up some old brake cable or similar...they snap when rusty.

    so what exactly are you doing to kill a cable in less than 10,000?
     
  14. Fabian

    Fabian Well-Known Member

    I don't play with the throttle - i work it hard in every gear and demand the Andre Agasi philosophy from my carburettor: sometimes even your best isn't good enough even when giving it your all - my carby understands this sentiment particularly well and is always on the receiving end of vigorous throttle actuation.
     
  15. jaguar

    jaguar Well-Known Member

    I still think your throttle pull is more than the carb allows, thus putting stress on the cable ends. I have been riding off and on for 40 years and that has never happened to me. (racing motocross too).
     
    FurryOnTheInside likes this.
  16. jaguar

    jaguar Well-Known Member

    also "luck", like Santa Claus, does not exist. The laws of physics, once again, were in control.
    When the cable broke the spring forced the slide shut quicker than the cable end could fall and bounce past the slide and into the engine.
     
  17. Fabian

    Fabian Well-Known Member

    Tell that to those unfortunate people who have had a cable nipple sucked through their engine.
     
  18. Fabian

    Fabian Well-Known Member

    ... an appropriate analogy that my girlfriend and ex-girlfriends can relate to!
     
  19. jaguar

    jaguar Well-Known Member

    If it ever happened that the nipple did get past the slide then, of course, there was enough stiction to prevent the slide from closing faster than nipple movement.
    In both cases the laws of physics are predominant.
     
  20. Fabian

    Fabian Well-Known Member

    All of this talk makes me feel like waking up my girlfriend for a stiction test, and we can get to the laws of physics later!
     
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