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  1. #1
    Clayton G's Avatar
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    Sbn fuel pump question

    I have a set of 44mm SBN carbs from a 97 Pro 785. I would like to know the fuel volume in liters per hour of the fuel pumps, each. I know that the 3 outlet fuel pumps are rated at 35 Liters per hour and the pentagon pumps are rated at 65 liters per hour. Since the Pro 785 carbs have 2 pumps, I would like to know what each is rated at.

    Also, I have read on Greenhulk that the 97 Pro 785 carbs were harder to tune than later Pro 785 carbs. Could anyone tell me why that is? What is the differences between these carbs?

    Thanks


  2. #2
    BlueFishCrisis's Avatar
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    Quote Originally Posted by Clayton G View Post
    Since the Pro 785 carbs have 2 pumps, I would like to know what each is rated at.
    Just out of curiosity, why are you looking for this information??

  3. #3
    Clayton G's Avatar
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    I'm going to put these carbs on a PSI SL 750 engine that I picked up a few years ago. Race ported, triple pipes, Boswell intakes, and 190 lbs compression. The engine came with only one carb, a Boswell 46mm Mikuni SBN. The engine came with impulse fittings on all three cylinders. I'm just trying to figure out how to make sure the engine gets adequate fuel delivery. The engine may have been run with an electric fuel pump at some time.

  4. #4
    Clayton G's Avatar
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    I emailed Mikuni Corporation and got my answer for fuel pump capacity. Still no answer as to why the 97 Pro 785 carbs are harder to tune.

    Here's what I've been doing to them.
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