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-   -   King Demon carb help please. Jet sizes? (https://www.racingjunk.com/forums/showthread.php?t=1290132)

Boatmanrand 04-20-2017 12:42 PM

King Demon carb help please. Jet sizes?
 
Running a 28 ft. catamaran with 622 Chevy Tall deck 14-71 Moonyham Blower with twin King Demon 1095CFM carbs. She runs great but blows black fuel soot all over back of boat. It has .90 main jets in it. looking to lean it down without burning a piston. Any help would be great.

curtisreed 04-21-2017 04:20 AM

If it were me I would step down 2 sizes at a time until I started getting close. Then you can start working to the point of being able to read the plugs for jetting. Just don't load the engine super hard after a jet change. I have never tuned in a boat, but this is how I would approach it.

Curtis

Boatmanrand 04-30-2017 10:33 AM

Thanks for your help I will do just that.

annamarks 06-03-2023 07:29 AM

you can start working to the point of being able to read the plugs for jetting. Just don't load the engine super hard after a jet change.




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