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Old 04-03-2014, 05:09 AM   #1
 
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Default Carb tuning

So the boat was a bit rich last year. Harder starts w closed throttle after running around pulling and playing. If you opened the throttle ( like you would a flooded engine she starts right up, albeit with a strong fuel smell from the exhaust)
Anyone have a link to a carb tuning or baseline settings to start with? A search for carb didn't turn up much.
The boat is a 1999 shabah 5.7 with a 2 barrel, alpha one.
Thanks for the info!

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  • Old 04-03-2014, 10:44 PM   #2
     
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    Default Re: Carb tuning

    Hey ga ,
    Set the float level up(float valve shut) @ 10mm
    Set the float drop @ 27mm
    Both settings from top of bowl with gasket in place
    Do not push down on the valve seat when adjusting , use some small needle nose to bend the tab. Otherwise it scars the needle end of the valve
    Set the idle mixture screws out 1 1/4 turns to start and go from there
    After you have it dialed in set choke , I always just play with it(never could see the marks on the cover very well)

    Hope that helps a little anyway

    Last edited by ColoradoDiablo; 04-03-2014 at 10:49 PM.
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    Old 04-03-2014, 10:55 PM   #3
     
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    Default Re: Carb tuning

    Awesome info. Definately understand as I'm used to motorcycle carbs. What is the refrence point on the float?

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    Old 04-03-2014, 10:56 PM   #4
     
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    Default Re: Carb tuning

    Use forward end of float for both settings.
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    Old 04-04-2014, 12:20 AM   #5
     
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    Default Re: Carb tuning

    I am assuming the top edge of the float?

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    Old 04-04-2014, 12:21 AM   #6
     
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    Default Re: Carb tuning

    And will I need any gaskets if I pull the carb off?

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    Old 04-04-2014, 02:21 AM   #7
     
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    Default Re: Carb tuning

    Top edge of float for upper setting , bottom edge of float for down side setting
    Probably gonna need a rebuild kit ga
    The gaskets have a tendency of drying out
    I'd get a rebuild kit ,clean the carb up good with carb cleaner , reassemble
    Use compressed air if possible while cleaning
    Bottom gasket from manifold to carb gets hard as a rock with heat. Then you'll end up with a vacuum leak , sucking air - causing more issues if you don't replace it
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