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Thread: 650 double pump

  1. #1
    Senior Member RACING JUNKIE
    Join Date
    Jan 2006
    Location
    EastWenatchee,WA
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    887

    650 double pump

    as some of you know, got a new carb tried it once runs excellent out of hole and mid,top end seemed lean , thought I had 76 in rear, there is no powervalve in rear, but had 78's in there Do you all think a 82 is to big in rear or will that work? have 72 in front with a 6.5 powervalve

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Mar 2003
    Location
    Fountain,MICHIGAN
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    856

    Jetting?

    I always go up 10 sizes on Jetting w/out a P/Valve!
    Later
    G 8)

  3. #3
    Senior Member RACING JUNKIE
    Join Date
    May 2006
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    2,044
    I know the rule of thumb is ten but I've never went that far, always seemed to rich for my combo, aren't you bracket racing this thing?
    If so your gonna want it on the lean side anyway, but not too lean. you'll have to read your plugs to determine that.
    A leaner mixture wont pick up ( e.t. ) as much when it cools off later in the night. you'll run much more consistent that way.
    Goodluck, Charles
    ***IN GOD WE TRUST***

  4. #4
    Senior Member RACING JUNKIE mytmouz's Avatar
    Join Date
    May 2006
    Location
    Pelahatchie, MS
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    980
    This is an example of mine, spib, I have a 650 DP, with no power valves, 50 cc pumps front and rear, and it's jetted with 76 front and 82 rear, ran this carb on most every streeter I've ever had. It's just been rebuilt and ready to go on the next one.
    If you think nobody cares, try missing a payment...

  5. #5
    Senior Member RACING JUNKIE
    Join Date
    May 2006
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    2,044
    Here's an example of the set up I was running on a holley 750 double pumper footbraking a mild bbc 468 bracket racer.
    No power vavle,
    82 square,
    50 cc front acc pump
    32 squirters front and rear
    Proform contoured venturi center section
    super crsip throttle response and ran dead on consistent all night.
    ***IN GOD WE TRUST***


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