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Thread: Carb Question

  1. #1
    Cliffy's Avatar
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    Carb Question

    Ive been trying my hardest to get me ski idling right etc

    One the carb high speed srecws is a black spade type fitting, this gets caught on a oil line when trying to reseat it

    im guess that its not fully reseated because im hitting the line is this the case or is it when it hits the line the carb is seated??

    Thanks
    Neil


  2. #2
    Cliffy's Avatar
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    Sorry its on a 97 780SLT

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Those plastic limiter caps just "pop" right off.

    My question is why are you messing with the hi speed screws if you're trying to get a nice idle? Hi speed screws are strictly for 3/4 throttle to WOT. Has no bearing on idle.

    The idle speed screw, and the low speed screw are what you adjust to smooth out idle.

    Take a look in the Mikuni carb manual posted in the tech section under Fuji fuel.

  4. #4
    Cliffy's Avatar
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    Cheers dude, I
    better explain I'm running really rich and I wanted to put eberthinh back to factory setttings and start a fresh then sort the idle out next

    So it should go in all the way to the plastic stopper to be classed as litely seated as per the service manual settings???

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    No. Remove the plastic limiter caps. Then turn the screws IN until LIGHTLY seated.

    Then turn them OUT the desired amount. Once they are set, you can snap the limiter caps back on.

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    Quote Originally Posted by xlint89 View Post
    Those plastic limiter caps just "pop" right off.

    My question is why are you messing with the hi speed screws if you're trying to get a nice idle? Hi speed screws are strictly for 3/4 throttle to WOT. Has no bearing on idle.

    The idle speed screw, and the low speed screw are what you adjust to smooth out idle.

    Take a look in the Mikuni carb manual posted in the tech section under Fuji fuel.
    Xlint,

    Since Niel has you on the subject of idle speed for the SLT 780, I would like to take the opportunity to ask you what the normal idle speed it for this motor on the trailer. I am at about 2950 out of the water and between 1250 and 1300 in the water under load. It is pretty smooth and has about a 50 rpm variation according to the MFD. I couldn't find anything in the manual that stated anything else about idle speed when not in the water.

    I am asking because there maybe some telltale signs that you guys may know about if the engine may be idling too high when not in the water that I should know about.

    Thanks.

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    For the carburetor engines, the out-of-the-water idle RPM is roughly double the in-water specified idle RPM.

    Idle speed can only be properly adjusted in the water, with a load on the impeller.

  8. #8
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Honestly, the out of water RPM is useless. No load on the engine and a PWC isn't meant to run on land.

    All idle RPM are to be measured IN WATER.

    Usually 1250-1300 is recommended. Yours sounds spot on.

  9. #9
    TopCop931's Avatar
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    Thanks guys. It does seem to be right there and I do run at more than double the rpm's out of the water at 2950 like K447 mentioned.

  10. #10
    Cliffy's Avatar
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    Cheers xlint I know what ill be doing tonight then

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