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Thread: Need some weber help

  1. #1
    Senior Member
    Join Date
    May 2008
    Oklahoma City

    Need some weber help

    Okay, I need some help from the black wizards of weber. I am trying to get my weber 45 DCOE tuned right, before I go all crazy from it. Right now, specs are as follows. Stock 20R with 118K or so, long tube 4 to 1 header, single 45 DCOE; venturis(chokes) 34; Main Jets 145; Air Corrector 150; Emulsion Tube F16; Idle Jets F855. Problems are; Horrible fuel econ, I know I will not get incredible MPGs, but I should get better than 8MPG. Bogging off idle, power dies about 3000-3500 rpm. Running terribly rich, idle mixture screws are all the way in. My thoughts are bigger chokes, more like 38 rather than the 34s that are in there. Bigger mains 150 or so. Way bigger air correctors 200 to 205 and smaller idle jets. Does any of this sound right to anyone? I have been doing a ton of research and everything tells me that the carb is set up completely wrong for the car Any help, advice or insight would be appreciated. Eventually, I will be switching to an R1 setup, but I would really like to get the weber running right so I can eventually sell it when the R1s are ready to go.

  2. #2
    Join Date
    Apr 2010
    St. Augrida, FL

    Re: Need some weber help

    I think your thinking is about right, this is tuning data i found for mikuni dcoe carbs, but the jet sizes and progression should be fundamentally similar. scroll down to the Mikuni PHH Carburetor Service and Tuning Manual. Page 19-20. The pilot jets are the ones that effect the first 20% of throttle opening. I think that is where your bogging is. Unfortunately i lost my notes on this. This is a recommended jetting chart again for mikuni applications like 20r . Hope this helps.

  3. #3
    Join Date
    May 2010
    St. Marys Ga

    Re: Need some weber help

    Before you go changing jets what is the history on this carb. Has it been sitting on a self, was it on any other car, if so what engine size. Running rich on a dcoe can be from leaking floats floats, incorrect float level adjustments. Bogging off idle can be caused by blocked progression holes. bogging at 3000 can also because float adjustments or a stuck needle valve. If the carb has not been rebuilt in some time I recommend that you do this first. I can get you a copy of rebuild instructions if you need them.

    For tuning jets this is a good start:

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