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Hi i was wondering if anyone could tell me what to set the mixture screw at, on a 1981 moto ski grandprix special 503 cc, dual carb. also for a 1991 skidoo safari, the mixture screw on that. i want to get them back to factory specs
 

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Mikuni carb's?
Start with the air screw at 1 full turn out from gently bottomed. Adjust in 1/4 turn increments until it idles smoothly.
 
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