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T120 650 cylinder head / two single Dellorto SSI Carbs

Discussion in 'Triton' started by steko, Jan 16, 2019.

  1. steko

    steko

    Joined:
    Oct 25, 2018
    Hello,

    does anyone have experience with two single Dellorto SSI carbs ?
    What is about idle adjustment, synchronisation, road performance
    and driving behaviour?

    Stefan
     
  2. kommando

    kommando

    Joined:
    May 7, 2005
    Never seen or heard mention of those carbs being used on a Triumph twin.
     
  3. grandpaul

    grandpaul VIP MEMBER

    Joined:
    Jan 15, 2008
    If those are anything like the ones on my '74 Guzzi, they have clever fuel "pumps" inside the needle jet body that give you a nice bit of juice off-idle. I reckon they'd be great with warm or hot cams...
     
  4. Matt Spencer

    Matt Spencer

    Joined:
    Jul 25, 2010
    The fancy racing 800 8 stud P U Wideline Dunstall Triton where wod Price worked
    had 32 Dellortto pumpers on it , way back when .

    Even came on B M W s at one stage . were hot sh*t aftermarket conversion in the 70s .
     
  5. Matt Spencer

    Matt Spencer

    Joined:
    Jul 25, 2010
  6. acotrel

    acotrel

    Joined:
    Jun 30, 2012
    Lack of throttle response is often due to loss of vacuum. I don't think a rapid richening of the mixture is the answer. The quickest acceleration occurs when the mixture is held at a level just before detonation occurs, at all throttle openings. It might be better to adjust to feeding the throttle on in one rapid controlled motion, rather than whacking it open. With road racers, riders of two strokes never have a problem with throttle response because they adjust to the limitations and anticipate. On dirt, things probably don't happen any quicker.
     
  7. Bernhard

    Bernhard

    Joined:
    Apr 20, 2011
    Re; “With road racers, riders of two strokes never have a problem with throttle response because they adjust to the limitations and anticipate.”. . . . Oh yes they do, particularly if you have a massive pair of 38MM powerjets on a water cooled Yamaha TZ350-that’s 38mm per 175cc cylinder!!! a bigger carb than most car engines have!
     
  8. acotrel

    acotrel

    Joined:
    Jun 30, 2012
    Some guys have trouble riding bikes which have 'peaky' motors. A four-stroke with a peaky motor can be worse than a two-stroke. Two-strokes usually have less torque when they get nasty. With the older two-strokes, the trouble usually occurs when guys slip the clutch to get them back on song. For anyone accustomed to doing point and squirt, older two-strokes can be very difficult. Later two strokes are designed to be more rideable, so they go faster.
    I don't know anything about motor cars, except that they are difficult to high-side.
     
  9. Matt Spencer

    Matt Spencer

    Joined:
    Jul 25, 2010
    " riders of two strokes never have a problem with throttle response because they adjust to the limitations and anticipate " when its going to sieze ,
    allways keeping a finger on the clutch lever .In the 70s anyway .

    Actually I rant about this on the Triumph section . Turkeys with C V carbs
    were somewhat inept as to the engines requirements when confronted by
    a direct action carb.

    Incidently , someone who converted a S U to cable / slide reported its
    responce too amplified to be rideable .
     

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