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    150 HP 2 stroke - no vacuum at carbs

    Good evening, I have a 203 Yamaha 2 stroke 150hp. It has 125 psi on all 6 cylinders and great spark. It has 3 carbs and only the mussel carb has good vacuum. The other two is almost non existent. If I pull the boot off either of the middle two spark plugs, there is a noticable decrease in...
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