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I have 1991 ski doo Formula MX with a 1991 mach1 617cc motor. I need to know what to tune the carbs to, how many turns for the hig speed and idler and is there a third screw?
 

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Ok well on those carbs there are only two screws and they are air mixture screws and idle screws. Now with the smaller screws those are air mixture screw and the larger ones that are in the middle of the carb are the idle screws. Ok with the adjustments with the smaller screws you want to seat them one turn out. The high speed mixture are done buy the main jets. With the larger ones you need to turn them out until the right rpm in set for the motor. Also they need to be equal. If you need any help please ask. Also you can go to Alljet.com to get the info for the main jets for a stock 617.
 
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