1998 mercury 50elpt 4s 4 stroke carbe tune

wheelers4life

Seaman
Joined
Jun 10, 2015
Messages
70
Ok been having some problems so today I cleaned my carbs. I set it up on my muffs and adjusted the air mixture screws to 2 1/2 turns out then started it up and adjusted for best idle. Then I put my carb tune pro on the outboard and my bottom carb is set low at 20 inches of vacuum and the other carbs are high at 36 inches of vacuum. I cannot get the bottom carb to rise because the idle screw is all the way out. What could be causing this problem.
Thanks
 
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