Customizing a Dnepr

Discussion in 'Motorbike Technical Discussion' started by sean_q, Dec 20, 2012.

  1. sean_q

    sean_q Guest

    I have two Dnepr motorcycles with sidecars, an MT-10 and an MT-11.
    Only the MT-11 runs. However, it can attain 50 mph max, making it
    usable only in town.

    I bought the MT-10 with the intention of modifying it for better
    performance. Meaning a more powerful motor and probably a mod
    for chain drive.

    My purist friends are scandalized at the notion of "ruining" such
    a vintage classic. I believe the word "butchering" was also used.
    However I've never heard them express such negativity at the practice
    of making a hot rod out of a 1932 Ford (as in "The Little Deuce Coupe"
    by the Beachboys). A yellow one appears in _American Graffiti_.

    Meanwhile I have a Triumph swing arm that looks like it would fit
    the Dnepr frame and a derelict Yamaha XS650 with a running motor
    (which is rated at about double the horsepower of an MT-10).

    ps. My preference would be to put a diesel motor in the thing.
    I've seen pix of exactly that on the Net. However I'm not certain
    how to go about it, and if there's too much involved I'd be
    satisfied using the Yamaha motor. Any advice appreciated.

    TIA, Sean Quinlan
    sean_q, Dec 20, 2012
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  2. sean_q

    crn Guest

    It should do a bit better than that, but not a lot. There are mods
    including better carbs and higher compression etc available but
    dont expect massive improvements.
    It would probably be a lot simpler to drop a BMW boxer engine in.
    Whatever turns you on .......
    crn, Dec 20, 2012
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  3. sean_q

    sean_q Guest

    It might be, as the BMW engine has the same mounting bolt
    pattern. Then there's the problem of matching it to the Soviet

    Using the Beemer tranny creates another problem -- the driveshaft
    spins in the wrong direction for the Dnepr's rear hub.

    sean_q, Dec 20, 2012
  4. sean_q

    Ace Guest

    Easy - just put it in reverse gear.
    Ace, Dec 20, 2012
  5. sean_q

    crn Guest

    So use a BMW hub and wheel. Which will lead you to the next gotcha.
    Whichever way you go you are going to lose the 2WD drive to the chair.
    Maybe you could find a modern russian 2wd combination which has
    been written off as a donor for a complete drive system.
    crn, Dec 20, 2012
  6. sean_q

    PipL Guest

    So the engines rotate in different directions, and one has a 2- and one a
    three-shaft box, then? It's the only way I can see that problem occurring,
    unless one has some really weird bevel box arrangement.
    PipL, Dec 20, 2012
  7. sean_q

    Mark Olson Guest

    I honestly don't see how the driveshafts can possibly turn the opposite
    way, assuming they are on the RHS of both bikes. That's assuming normal
    style gears with the pinion at the front of the final drive, not worm
    Mark Olson, Dec 20, 2012
  8. sean_q

    PipL Guest

    A swift Google suggests that the bevel is on the right on at least some models
    of both BMW and Dnepr. Can only be number of shafts if true - actually,
    2-shaft is unlikely because you wouldn't get enough offset to clear the wheel,
    but maybe 3 vs 4 shaft arrangements, unless there's something truly weird in
    one gearbox.

    I'm intrigued.
    PipL, Dec 20, 2012
  9. Cheapness didn't mean shite, back then, from the USSR. Their goods
    were sold in the West to obtain foreign currency and often were the
    best of what came off the production line, designated for export.
    Look at Russian lenses.
    Grimly Curmudgeon, Dec 27, 2012
  10. sean_q

    SteveH Guest

    There was something along those lines in the Museum of East German Life.

    'What do we do with all the quality control rejects?'
    'Sell them on the domestic market.'
    SteveH, Dec 27, 2012
  11. sean_q

    ts Guest
    ts, Dec 31, 2012
  12. Really wondering WTF they did for a clutch.

    BMW hangs the clutch mostly off the flywheel and
    crankshaft, while Harley hangs it off the gearbox.

    Not sure with stuff this old, but if it's anything like
    newer stuff, I can't quite figure out how you'd
    marry the Harley engine and BMW gearbox.
    Rob Kleinschmidt, Jan 1, 2013
  13. sean_q

    Bill_h Guest

    Bill_h, Jan 1, 2013
  14. Agreed, but the type and location of the clutch are still
    not clear. Doesn't look like it's big enough to accommodate
    a BMW single plate clutch and it looks a little tricky
    trying to hang a multi-plate clutch between the Harley
    crank and the Ural transmission, considering that
    neither one was designed to accept it.
    Rob Kleinschmidt, Jan 1, 2013
  15. All the boatanchor market is saturated.
    Grimly Curmudgeon, Jan 2, 2013
  16. sean_q

    Twibil Guest

    Well, it *is* underwater, you know.
    Twibil, Jan 2, 2013
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