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Info MZ 250 single

Discussion in 'Other 250's' started by trevorlatala, Oct 30, 2018.

  1. trevorlatala

    trevorlatala Active Member Contributing Member

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    Just purchased a mid 1980 Mz 250 single collected it yesterday disk front brake started first kick after going through the MZ start procedure
    40,000 miles on the clocks yes it has a speedo and a rev counter I have often wondered what a minimalist bike would be like single two stroke will not work with anything less
    I need to get it Mot before i hit the road and as i have six bikes I think my R65 Beemer has to go as I can only get 4 on the insurance
    Now does anyone out there have any experience of these machines i did a quick look through the forum but did not find any reference to them
    I am really looking forward to going out all though here in the UK the outside temperature is now below 0 deg centigrade it will take me back 50 years to my first bike a £ 5 Francis Barrnet that i purchased at 16 all that did for me was a 5 mile trip to the local Honda dealer where it turned into the deposit for a £220 Honda CD175 loved that bike fetching ridiculous money now
    Ps still working on the Honda CB250 RSA
    Trev
     
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  2. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    I like the MZ250 ETZ. Would like to get one one day just for the experience.
     
  3. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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  4. trevorlatala

    trevorlatala Active Member Contributing Member

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    My Bike:
    Honda CB250 rs Jawa 350 TS
    What a bugger this bike turned out to be talk about spending on it points air filters new seat unit
    Main problem was with the carburation
    The first carb it came with was awful it would not tick over and over run was awful excessive fuel and stuttering
    Purchased a second carb well that,s a lesson on how to waste time it would not start or run turns out it was a china copy with badly drilled airways etc the dealer to be fair gave me the money back and told me to bin it
    3rd carburetor would not start turns out the choke mechanism had fallen apart there is a blanking rubber over the choke jet that had welded down took it apart obtained a new unit it now runs
    had one small run just to set it up and to be honest its quite a charmer
    Now to get on wityh the paintwork
    Trev
     
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  5. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Mikuni VM's are cheap and good, if you are not worried about originality.
     
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  6. trevorlatala

    trevorlatala Active Member Contributing Member

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    i normally turn of the fuel supply to the carb while the engine is running
    This i did and noticed the idle sped increase before the engine cut out does this mean that the fuel level is to high in the float bowl

    Trev
     
  7. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Sound's like it is too high
     
  8. trevorlatala

    trevorlatala Active Member Contributing Member

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    I wonder is their a device or way of adjusting the float level while the bike is running i can imagine a remote float bowl remote sensor that controls fuel flow any one out there done this ?
    Trev
     
  9. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Float level is best left alone, IMHO.
     
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  10. risky

    risky risky

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    when you turn the fuel off the mixture leans out anfd the motor revs higher before it cuts out. also happens if you do a crank seal. try it with a 2 stroke lawn mower.
     
  11. trevorlatala

    trevorlatala Active Member Contributing Member

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    What do you mean if you do a crank seal ? I have replaced crank seals in the past when the engine would not idle to me the seal fail would weaken the mixture
    Now of course the fuel rate must be able to supply the motor under higher revs and loads and there is a chance of running lean if the float level is to low
    Trev
     
  12. risky

    risky risky

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    when the fuel supply is turned off the fuel becomes less and as such the mixture is leaner. as this happens on a 2 stroke the engine revs rise and as the fuel ceases the motor stops.
     

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