What does 'Pre-unit' mean?

Discussion in 'Classic Motorbikes' started by Gordon Baxter, Sep 21, 2006.

  1. Have come across this term a few time recently. Can anynoe tell me what it

    Gordon Baxter, Sep 21, 2006
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  2. Gordon Baxter

    Krusty Guest

    Separate engine & gearbox i.e. before they were merged together in a
    single unit.

    Off-Road Classifieds

    '02 MV Senna '03 Tiger 955i '96 Tiger '79 Fantic Hiro 250
    Krusty, Sep 21, 2006
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  3. Gordon Baxter

    A.Clews Guest

    Thus spake Krusty () unto the assembled multitudes:
    It also means that there were two sets of badly-fitting engine-case mating
    surfaces through which to piss oil, rather than just the one, though the
    later 'unit' machines somehow overcame this problem and managed to piss
    just as much oil on the floor as the older designs.
    A.Clews, Sep 21, 2006
  4. Gordon Baxter

    Paul - xxx Guest

    came up with the following;:
    British design at it's best ... improved engine oil throughput ... ;)
    Paul - xxx, Sep 21, 2006
  5. Gordon Baxter

    chrisu Guest

    a little unfair - my unit bonneville leaked just as much oil as the
    pre-unit one i had. :)

    oh and harleys are also pre-unit - but i'm sure you knoew that.
    chrisu, Sep 21, 2006
  6. Gordon Baxter

    Gyp Guest

    Mine isn't.
    Gyp, Sep 21, 2006
  7. Gordon Baxter

    chrisu Guest

    ok sportster owning pedant................. ;-)
    chrisu, Sep 21, 2006
  8. Gordon Baxter

    Lozzo Guest

    Gyp says...
    I've just a bought a Hinckley Triumph and the first genuine accessory I
    bought was the fake oil puddle to go on the garage floor. I wanted that
    real Brit bike experience.
    Lozzo, Sep 21, 2006
  9. Gordon Baxter

    Gyp Guest


    If it's any consolation it feels like it's going to become pre-unit
    every time I ride it...
    Gyp, Sep 21, 2006
  10. The only bike I have possessed, and I have had a few, not as many as your
    good self granted, which pissed oil was my RD400. Not that I particularly
    blamed it for it, best 300 quid I ever spent that was:)

    Regards, Ian
    Ian Northeast, Sep 22, 2006
  11. AHEM! excuse me but if you put them together PROPERLY then they don't leak!
    I get a bit sick of people who whine about old Brits leaking oil and when
    you question them you get this.
    "O.k. so how old was this bike then?" reply "Oh about 30 years old" "And how
    many owners had it had?" "Twenty" "And what was the sum total of their
    toolkit, a lump hammer and a cold chisel?" "Er, well yeah" "And the thing is
    STILL FUCKIN" RUNNING!!??" "ERm well when you put it like that......"
    They were fine in their day, the BEST in the world if fact, so just look at
    the things in perspective, when they were new they were just as good as
    anything else.
    End of rant. (Calm blue Ocean)
    Wonko the Angry, Sep 22, 2006
  12. Gordon Baxter

    Krusty Guest

    Much like if you put a usenet post together properly by posting beneath
    the text to which you are replying, you won't cause a leakage of anger
    from the other contributors.

    Off-Road Classifieds

    '02 MV Senna '03 Tiger 955i '96 Tiger '79 Fantic Hiro 250
    Krusty, Sep 22, 2006
  13. Gordon Baxter

    chrisu Guest

    mine was the same - thats why it had to go.............

    i ride a new dyna this summer while in the states - still agricultural
    but ok even after 200+ miles - god bless rubber mounting and balance shafts
    chrisu, Sep 22, 2006
  14. Gordon Baxter

    chrisu Guest


    note posting at the bottom..........

    With all due respect - I'm old enough to know what they were like when <
    10 years old - they always leaked - to be fair not always from the same

    The triumph leaked from the primary chaincase - always - my A10RGS
    didn't but leaked from the rocker case - always - design, engineering
    and gasket technology left a lot to be desired. Thats why japanese bikes
    won the lions share of the market (oops i may have opened an old cans of
    worms here - please disregard the last statement).
    chrisu, Sep 22, 2006
  15. Gordon Baxter

    A.Clews Guest

    Thus spake chrisu () unto the assembled multitudes:
    My unit Tiger 650 somehow managed to leak as much oil as a pre-unit and
    unit put together. How it managed to do that at the same time as dropping
    bits off along the road was a never-ending source of wonderment which
    stimulated hours of conversation over our pints of Young's Old down at The
    Fountain in Plumpton Green.
    A.Clews, Sep 22, 2006
  16. Gordon Baxter

    A.Clews Guest

    Thus spake Wonko the Angry () unto the assembled multitudes:
    My Tiger 650 leaked even when it was new, so you'd think the manufacturer
    would have set a decent example.
    A.Clews, Sep 22, 2006
  17. Gordon Baxter

    Roger Hunt Guest

    Amazing - I have nearly finished building a Triumph 650 from parts
    salvaged from the gutter in SE England.
    Roger Hunt, Sep 22, 2006
  18. Gordon Baxter

    A.Clews Guest

    Thus spake Roger Hunt () unto the assembled multitudes:
    They're all mine, I tell 'ee! Give 'em back immediately. ;-)

    Mined ewe, I did once lose a few bits (indicators, lamp covers) when I
    parked it outside where I lived in Portslade. Later saw same bits in the
    window of a Brit spares shop called Imola 500 down the road. I could never
    prove that they were mine (and no, I didn't buy them back), but a hairy
    toerag who worked there used to walk past my place on the way to work.
    A.Clews, Sep 22, 2006
  19. There were leaky unreliable American, German and Italian bikes then too,
    you know.

    It is a nice thing to see a properly put together old Brit bike -
    something the factories didn't manage all that often - with careful
    assembly and modern gasket materials the oil doesn't leak, much.
    Grimly Curmudgeon, Sep 22, 2006
  20. Gordon Baxter

    Roger Hunt Guest

    I think a lot of the problem was caused by piss-poor crankcase
    breathers. I mean, the earlier 350/500 unit Tri twins were supposed to
    be able to breathe through a ¼" dia tube. Hopeless design!
    I remember admiring a Commando Interstate with about 120 miles on the
    clock and it was pissing oil from around the cylinder head, and
    apparently through it, due to a batch of porous castings, I heard.
    Roger Hunt, Sep 22, 2006
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