Resurrecting an Italian Supermodel on her 50th Anniversary for the family's 100th birthday party

Discussion in 'Ride Reports - Epic Rides' started by flyingdutchman177, Aug 21, 2021.

  1. Bgunn

    Bgunn Posible mañana

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    Rockford.Wa - Yuma.Az
    Great looking bike.. Hoping there's less wear and tear on JJJ then from your last trip together.
    #61
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  2. ShOqUePoT

    ShOqUePoT GS Pot

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    What a pair of great looking bikes. Looking forward to following this!
    #62
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  3. borderlinebob

    borderlinebob Been here awhile

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    Aug 21, 2016
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    CANADA-100 ft N of International Falls, MN
    Story getting better every day.
    :clap
    #63
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  4. davidaid

    davidaid Been here awhile

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    Jun 13, 2008
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    135
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    Boise, ID
    I had a 75 75/6 that I sold 10 or so years ago and regretted it ever since. It was the orange R90S that a friend of our family had when I was 10 years old or less that really turned me on to BMW motorcycles. Now I'm fifty and am on my 3rd BMW - I don't ever have more than one bike and I tend to have them a long time. If you come through Boise, look me up.
    #64
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  5. Mrmerlin

    Mrmerlin Rollin 2019 R 1250 GS, 2014 HD SGS, 2016 RK

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    Oct 16, 2009
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    1,232
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    Philly PA
    FWIW I put 42 K miles on my 78 LeMans it had the same intake velocity stacks,
    the engine never missed a beat and never any damage to the cylinders,
    at about 36K I had to take the heads off due to misfueling with diesel fuel, all the parts looked fresh.

    At one point I got a set of KnN filter pods and fitted them instead of the velocity stacks.
    Well they seemed to work OK till about 5 K RPM then the engine would fall flat,
    I put the old gray velocity stacks back on and she went straight to redline without a squabble.
    #65
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  6. Cafeguzzi

    Cafeguzzi Been here awhile

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    Aug 8, 2011
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    frisco
    the Dell'Ortos work only with velocity stacks at higher RPMs.
    #66
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  7. Kiwi Canuck

    Kiwi Canuck Been here awhile

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    Mar 10, 2012
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    Langley, BC
    I have a couple of these, 1980 GS1000S, but can't get to the USA right now to join you guys.

    [​IMG]
    #67
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  8. flyingdutchman177

    flyingdutchman177 Adventurer

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    I have been talking to Mark Hoyer, editor-in-chief at Cycle World Magazine about doing an article about this ride.
    100th Anniversary of Moto Guzzi
    50th Anniversary of the V7 Sport.
    We are trying to find a modern V7 Sport to ride along with me for comparison.
    And then just last week, John Burns, with motorcycle.com asked if i would be interested in doing an article for this occasion.
    So it seems this ride is going to get some press.
    I still need to figure out what is causing the carb slide to stick slightly and then slower lower down.
    Any suggestions?
    And if any one has a newer V7 Sport, let's ride. Send me a PM.
    #68
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  9. Cafeguzzi

    Cafeguzzi Been here awhile

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    frisco
    greg bender would know and charlie mullendore too. they are the MG druids. charlie is here as @MZRider.
    #69
  10. BarryB

    BarryB Been here awhile Supporter

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    Feb 16, 2004
    Oddometer:
    929
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    Texas Hill Country
    I knothing about Guzzi carbs, but I guess you ruled out a sticky throttle cable. Is there anything causing a vacuum on top of the slide? What carbs are they, anyway?
    #70
  11. ShOqUePoT

    ShOqUePoT GS Pot

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    I'm not a Guzzi guy but could it be a tired return spring? I had that same issue on an old CB750. Assuming you ruled out some sticky varnish on the slide and/or throat.
    #71
  12. flyingdutchman177

    flyingdutchman177 Adventurer

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    Here is the carb
    It is a pumper slide carb
    The return springs seem to be strong.
    I cleaned the slide well.
    And the cables are like new
    And other ideas? 20210831_004604.jpg
    #72
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  13. flyingdutchman177

    flyingdutchman177 Adventurer

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    That is what it sort of seems like.
    They are not CV carbs. There is no diaphragm. The cable works the slide directly .
    The interesting thing is, both time the problem showed up was about 4 miles in to the ride. Like it only does it when the bike gets really warmed up
    #73
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  14. NoelJ

    NoelJ Long timer

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  15. flyingdutchman177

    flyingdutchman177 Adventurer

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    #75
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  16. beedleblt

    beedleblt Rather be riding

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    Sep 9, 2015
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    65
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    MoTown, Graffiti USA
    Vacuum leak?
    #76
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  17. ShOqUePoT

    ShOqUePoT GS Pot

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    Was anything done to those carbs before storage? If the carbs were rebuilt or replaced I still think you might need different slide springs. I put brand new carbs (Mikuni) on my CB750 as part of a conversion kit and the springs provided were too light, causing these same symptoms.
    The other issue I've seen is during cleaning on a twin carb bike (or installing a new cable), people will inadvertently switch slides to the wrong carb. They will fit but have the ramp on the outlet instead on inlet. Seems very unlikely on an opposed engine though. It would be running very rich too.
    #77
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  18. NoelJ

    NoelJ Long timer

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    I was more interested in the discussion about ethanol fuel and the admittedly small loss of lubrication on an already touchy slide. Aluminum parts gall to each other remarkably easily at times. Almost every modern vehicle has a brass throttle plate because an aluminum one gets sticky and "corks" at initial opening.
    #78
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  19. BarryB

    BarryB Been here awhile Supporter

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    Feb 16, 2004
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    929
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    Texas Hill Country
    Again, I don’t really know what I’m talking about, but if the slide is returning to the down position, and the idle is staying high, there must be a vacuum leak or the accelerator pump may be leaking. There is additional fuel coming from somewhere. Are you sure that the float is shutting off the needle reliably?
    #79
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  20. Ratman

    Ratman Lucky Rider

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    Baja is good

    I say put some Seafoam in the tank and run a couple tanks of gas thru it. I bet the problem will go away.
    #80
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