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  1. #1
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Do 780's have a return line restrictor?

    I searched the schematics and didn't see a restrictor listed on 780's like I see on 750's. Did they eliminate the restrictor when they installed the high volume triple pump?


  2. #2
    On the 780 carbs I recently installed the actual fuel return connection had a tiny hole which acted as a restrictor.

  3. #3
    Wankel till I die!! jonjonwells's Avatar
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    Quote Originally Posted by mystahagy View Post
    On the 780 carbs I recently installed the actual fuel return connection had a tiny hole which acted as a restrictor.
    Correct.... 44's have the same setup.

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    I'm sure I'm asking too much, but does anyone know what size the hole is? I'm wondering if the pentagon pump puts out so much more fuel that the restrictor needs a larger orifice to keep the fuel pressure down. So as to not dribble past the needle and seats. Or do I go with the next size up spring?

  5. #5
    la90043's Avatar
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    yup...............the mag carburetor fuel outlet/return fitting has the tiny hole in it.................

    hole size is small.................smaller than needle pin.

    interesting thinking.................

    causing high pressure

  6. #6
    ph2ocraft's Avatar
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    Quote Originally Posted by xlint89 View Post
    I'm sure I'm asking too much, but does anyone know what size the hole is? I'm wondering if the pentagon pump puts out so much more fuel that the restrictor needs a larger orifice to keep the fuel pressure down. So as to not dribble past the needle and seats. Or do I go with the next size up spring?
    Did you check fuel pressure at idle and have you thought about drilling out the return and installing one of crazya's in line restrictor so you can change the return jet until you get the correct fuel pressure within the system?
    With this system it also makes it easy to measure the fuel pressure between the return of the carb and the inline restrictor.

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by ph2ocraft View Post
    Did you check fuel pressure at idle and have you thought about drilling out the return and installing one of crazya's in line restrictor so you can change the return jet until you get the correct fuel pressure within the system?
    With this system it also makes it easy to measure the fuel pressure between the return of the carb and the inline restrictor.
    In the proccess of doing just that. Local auto parts stores didn't have an in-line pressure gauge. I'll be doing that as soon as I pick one up and go with the adjustable CrazyA restrictor.

  8. #8
    ph2ocraft's Avatar
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    Cool, maybe look for roughly 2 pounds at idle and 4 minimum at WOT?

  9. #9
    780's carbs had a built in restrictor inside the carbs

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