The innate hostility of inanimate objects

Discussion in 'UK Motorcycles' started by TMack, Mar 3, 2007.

  1. TMack

    TMack Guest

    As it was sunny today I decided to do a bit of tweaking with my S.O. Suzuki
    Savage. These were set up to run really lean when manufactured to reduce
    emissions. However, improve the breathing and fit a bigger main jet and
    substantially more performance can be obtained. Even when tweaked they are
    still dog slow compared with bikes of similar capacity but 90mph top is
    better than the 80 or so when stock. Standard procedure is to remove the
    tank to get at the carb (Mikuni BS40), which means removing the seat, which
    means removing the tail light (because of my non-standard seat) all of which
    is a right pain. Instead, I removed the battery and battery box (much
    quicker) which made the carb easy to get at. All I needed to do was remove
    the 4 bolts holding the reservoir at the bottom of the carb, unscrew the
    main jet and fit a bigger one.

    All went smoothly the first time and I road tested it - seemed a bit too
    rich. So, off with the battery and battery box, off with the reservoir and
    unscrew the jet. Screw in the a slightly smaller main jet. But I keep
    trying to screw in the new jet but nothing seems to be happening, it wont
    engage with the threads. WTF?? I try the original, it won't engage either.
    Much scrabbling around later I finally find a mirror small enough to get
    under the carb to look at what is going on. The block that the main jet
    screws into turns out to be a brass fitting, sitting in a tube in the alloy
    carb body. It is slotted so that a small retaining pin will engage with the
    slot and prevent it turning when the jet is screwed into it. However, there
    appears to be nothing to prevent this brass fitting from sliding further up
    the tube that it sits in - and it has now moved far enough up the tube to
    disengage from the retaining pin and it has turned about 45 degrees so the
    slot is no longer aligned with the retaining pin. It appears to be stuck in

    What started out as a simple job for a nice sunny afternoon has now turned
    into a marathon to get this brass fitting back in its right place. Instead
    of just screwing in a new jet I find myself trying to perform the equivalent
    of keyhole surgery, upside down using a mirror and watchmakers screwdrivers
    to try to tease this thing back into position. It took AGES to get the
    fucking thing back in place. The most annoying part was the way it lulled
    me into a false sense of security by allowing the first exchange of jets to
    take place with no hassle whatsoever. **** you Mr. Mikuni.
    TMack, Mar 3, 2007
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  2. TMack

    Lozzo Guest

    TMack says...
    This happens on RD carbs. You need to get into the venturi and manouver
    the emulusion tube back into position from there. This may involve
    taking the diaphragm and slide out to give access from the top of the
    carb. You'll save a shitload of time doing it this way, rather than
    farting around working upsidedown with mirrors and crap like that.
    Lozzo, Mar 3, 2007
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  3. TMack

    Eiron Guest

    You seem to be a bit of a ham-fisted tosser.
    Why not just reseat the emulsion tube while you have the needle out
    to adjust the midrange mixture?
    Eiron, Mar 3, 2007
  4. TMack

    Beav Guest

    I'm thinking that because of his non standard seat arrangement causing him
    to leave the tank in situ, he couldn't pull the top of the carb off so the
    needle never came out of the emulsion tube.


    VN 750
    Zed 1000
    OMF# 19
    Beav, Mar 3, 2007
  5. TMack

    TMack Guest

    Ding Ding Ding
    TMack, Mar 3, 2007
  6. TMack

    TMack Guest


    The block that the main jet screws into turns out
    I wouldn't have saved a shitload of time because to get the tank off, I
    would have to get the seat off and to get the seat off I would have to
    remove the rear light - remember that bit? The rear retaining bolt for the
    seat is under the rear light. The rear light is held in place by three
    tight-fitting very hard-to-get-to bolts that have to accessed under the rear
    mudguard with very little room between tyre and mudguard - getting it off is
    bad enough but replacing it can be a real hassle as it is murder trying to
    get it aligned properly as it is a VERY tight fit against the rear of the
    seat. It would have taken much longer if I had gone down that route. The
    mirror and watchmakers screwdrivers took a long time but removing light,
    seat and tank and subsequent replacement would have taken much longer.
    TMack, Mar 3, 2007
  7. TMack

    Kim Bolton Guest

    The vademecum for my machine contains the homily "Leave all things on
    the motorcycle as the engineers intended" - and I think that's damn
    good advice.
    Kim Bolton, Mar 3, 2007
  8. Agreed. Every now and again you get the odd demented factory engineer,
    though (usually Italian).

    Who can forget the Moto Guzzi boffin who decided to give the bikes a
    car-type spin-on spin-off oil filter cartridge (one of the first ever to
    be fitted to a bike), and then thought this QD miracle was best located
    *inside the sump*?
    The Older Gentleman, Mar 4, 2007
  9. TMack

    Pip Luscher Guest

    On Sun, 4 Mar 2007 08:46:53 +0000,
    Argh. You've just reminded me: it's *that* mileage again.
    Pip Luscher, Mar 4, 2007
  10. TMack

    Kim Bolton Guest

    Ah....Italian....perhaps that explains it.....

    Didn't the Honda 500 Four have a cartridge oil filter located between
    the downpipes at the front of the engine, and held in place by a
    single central bolt? ISTR is was dead easy to change.
    Kim Bolton, Mar 4, 2007
  11. TMack

    Timo Geusch Guest


    <points to the nether regions of the K1100 engine>

    Granted, it's not *in* the sump...
    Timo Geusch, Mar 4, 2007
  12. Yes it did, and no it wasn't, not if the central bolt corroded into
    position, as it did because it copped all the road crap.

    And then you'd round off the silly 12mm head, trying to undo it.

    This is why accessory merchants made a fortune selling 17mm headed
    aftermarket oil filter bolts.
    The Older Gentleman, Mar 4, 2007
  13. TMack

    Pip Luscher Guest

    At least BMW designed in a neat little access hatch.
    Pip Luscher, Mar 4, 2007
  14. TMack

    Timo Geusch Guest

    Yep, fair enough. As long as you remember to put container underneath it
    before undoing the bolts; otherwise you won't really be calling it "neat".
    Timo Geusch, Mar 4, 2007
  15. TMack

    Beav Guest

    And we've all done it too. Found the "easy" way, only to discover just how
    wrng we can be.


    VN 750
    Zed 1000
    OMF# 19
    Beav, Mar 4, 2007
  16. TMack

    Beav Guest

    And didn't Yamaha fot their oil filter on the XV1100 on the front of the
    motor requiring the exhaust system to be removed in order to change the

    Of course they did.


    VN 750
    Zed 1000
    OMF# 19
    Beav, Mar 4, 2007
  17. TMack

    SteveH Guest

    Honda CBX750 with an alternator chain running at 2x engine speed buried
    deep between cylinders 2 and 3. It often slackened off, meaning a
    complete engine strip to replace it.
    SteveH, Mar 4, 2007
  18. TMack

    deadmail Guest

    Eh? It's next to the oil drain... how could you 'forget' to put a drain
    pan under it?
    deadmail, Mar 4, 2007
  19. TMack

    TMack Guest

    in message
    So that poses the question, "what is the worst and/or most stupid piece of
    design ever encountered in a motorcycle or its fittings?"
    TMack, Mar 4, 2007
  20. Honda CB500T ignition system - two sets of points, mounted as you'd
    expect on a points plate (as per, for example, an old Jap four)....

    .....except that.... set is non-adjustable. You have to set the timing up on one pot
    as normal, and adjust the setting on the other pot by varying the points
    gap. Utterly insane.

    Suzuki T/GT500 two-stroke twin (and, I think, some of the smaller ones,
    too): rev counter drive is disengaged when you pull in the clutch lever.
    OK, strange, but not the end of the world. However, the *oil pump* is as
    well. One thing you *do not do* on one of these old strokers is sit for
    a long time at the lights, clutch pulled in, revving the engine.
    The Older Gentleman, Mar 4, 2007
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