Paging Sweller - Le Mans

Discussion in 'Classic Motorbikes' started by 'Hog, Aug 15, 2005.

  1. 'Hog

    'Hog Guest

    'Hog, Aug 15, 2005
    #1
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  2. 'Hog

    sweller Guest

    There's an owner comfortable with his sexuality...

    I'd take issue with this though: "the triple Brembos are in standard
    "linked" Guzzi fashion, and the Goodridge pipes can be altered to
    standard in no time".

    Unless 'no time' means completely re-piping and supplying two new master
    cylinders. The front one can't cope with two P8 callipers and the rear
    is too much for a single P8 even with the reducing valve in place.

    Smells of failed project to me but something could be done with it.
     
    sweller, Aug 15, 2005
    #2
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  3. 'Hog

    'Hog Guest

    Yeah for something a little over a grand. For nearly two or more? nope

    What's with "with the timing gears fitted etc"

    'Hog
     
    'Hog, Aug 15, 2005
    #3
  4. 'Hog

    sweller Guest

    Good point. I'd pay what the bid's at ATM tops (£1,050). Its not even
    met reserve. Anything else is far too much as even for parts there's not
    a lot on it.

    It's considered de rigeur to change the Le Man and T3 timing chains for
    gears. It's bollocks as they don't need them.

    Chains with the auto adjusters are good, quiet and accurate. The cogs
    don't wear and the chains last for 30-40K. They're not even a big deal
    to change when they do go. It's easier with the engine out but can be
    done in situ.
     
    sweller, Aug 15, 2005
    #4
  5. it do look rather tidy, though.

    is there any point in unlinking the brakes? I always thought the Guzzi
    linked brakes were vaguely sensible, unlike Honda's daft system.
    well, yeah. but it doesn't look as though it needs a lot doing, to be fair.
     
    Austin Shackles, Aug 15, 2005
    #5
  6. 'Hog

    JB Guest

    They are definitely best left linked. As Sweller stated quite accurately,
    it's a pain in the arse changing 2 perfectly good m/cyls for no real
    benefit. You can squeal the ront just on the single front disc. Bloody good
    are Brembo calipers on cast iron discs.

    Yup.

    JB
     
    JB, Aug 15, 2005
    #6
  7. 'Hog

    platypus Guest

    platypus, Aug 15, 2005
    #7
  8. 'Hog

    sweller Guest

    ....and clocks, bars, mudguards (both), sidepanels to begin with

    I've just noticed the forks are round the wrong way as well...
     
    sweller, Aug 15, 2005
    #8
  9. 'Hog

    Pip Luscher Guest

    Pip Luscher, Aug 15, 2005
    #9
  10. I rather liked it...
     
    Austin Shackles, Aug 15, 2005
    #10
  11. 'Hog

    Guest Guest

    They *look* bent in the two sideways-on pictures.

    "Trick of the light, mate." Probably, but there's still sommat odd
    between the triple clamp and the wheel.

    Regards,

    Simonm.
     
    Guest, Aug 16, 2005
    #11
  12. wrong way? how so?

    mind, I agree that the RHS fork looks bent in the side-on photo. the LHS
    one doesn't, AFAICS.

    definitely one to examine first, though.
     
    Austin Shackles, Aug 16, 2005
    #12
  13. 'Hog

    'Hog Guest

    Callipers would be ahead of the wheel as with my R100. Simple job to
    turn it all around though!

    'Hog
     
    'Hog, Aug 16, 2005
    #13
  14. 'Hog

    sweller Guest

    Actually, I'm probably wrong.

    This is the ebay machine - other than the obvious trailing callipers you
    can see the fork drain at the front of the slider:
    http://i13.ebayimg.com/04/i/04/a5/03/bb_12_sb.JPG

    Another Le Mans II has them the same
    http://www.italomotos.de/guzzi_lemans2_gr.jpg

    However, a MkI
    http://www.cmelectronica.com.ar/Galerias/Fotos/1970/MotoGuzzi-LeMans-850-1
    976.jpg

    and my bike:
    http://www.tallbloke.net/img/BoSM05/album/images/DSCF0033_jpg.jpg
    Ignore the different callipers as they used to be P8s.
    http://sweller.co.uk/sob/images/fot-guzzi.jpg

    Also worth noting on the ebay bike the front two piece Le Man specific
    discs are very worn (see ridge) and are made of unobtainium.
     
    sweller, Aug 16, 2005
    #14
  15. might be that some models have 'em behind the fork, some in front.
    Mechanical engineering suggest to me that behind ought to be better, as the
    brake reaction pushes the caliper towards the fork leg, rather than pulling
    it away, which ought, other things being equal, to be stronger.
     
    Austin Shackles, Aug 16, 2005
    #15
  16. 'Hog

    platypus Guest

    The calipers were ahead of the forks on all the T3s, changed to behind for
    the T4 in 1980. Similarly, the LM1 had them in front, the LM2 had them
    behind (1978).

    I suspect this may have been achieved by turning the forks around.
     
    platypus, Aug 16, 2005
    #16
  17. 'Hog

    Pip Luscher Guest

    Mass centralisation rings a bell. IIRC, having the calipers behind
    the forks reduces the moment of inertia of the whole steering assembly
    'cos of the steering stem offset.
     
    Pip Luscher, Aug 16, 2005
    #17
  18. 'Hog

    JB Guest

    Wonder how many Guzzi riders noticed the change though? Probably not quite
    as many as the LM4 owners noticed the 'new'16" front wheel.

    JB
     
    JB, Aug 16, 2005
    #18
  19. 'Hog

    TOG Guest

    It's nicely put together, but I think it looks gash. That fat tank
    doesn't go with the slimmed dfown looks, nor the skimpy seat (which
    would itsel be a genuine PITA after 10 minutes, I'm sure).

    For two grand? No way.
     
    TOG, Aug 17, 2005
    #19
  20. I don't know about Guzzis, but I certainly noticed it on my
    GT380M. I put a bikini fairing on it whose centre-of-pressure was possibly
    ahead of the steering axis and which obviously added to the moment of
    inertia of the steering system anyway. It then became prone to steering
    wobbles so I swapped the forks and disk over (the wheel was already
    drilled and tapped for dual disks) so the caliper was behind the fork.
    Steering stability returned.

    --
    Ivan Reid, Electronic & Computer Engineering, ___ CMS Collaboration,
    Brunel University. Ivan.Reid@[brunel.ac.uk|cern.ch] Room 40-1-B12, CERN
    GSX600F, RG250WD, DT175MX "You Porsche. Me pass!" DoD #484 JKLO# 003, 005
    WP7# 3000 LC Unit #2368 (tinlc) UKMC#00009 BOTAFOT#16 UKRMMA#7 (Hon)
    KotPT -- "for stupidity above and beyond the call of duty".
     
    Dr Ivan D. Reid, Aug 17, 2005
    #20
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