Check compression to make sure that cylinders (all cyls) are okay. What are the compression readings? If okay, remove the carburetor, clean thoroughly, and rebuild it using a complete carburetor kit.
Pay particular attention as to what size jets go where..... sizes marked on jets.
Be sure to maually clean the two high speed jets (2 per carb) that are located in the bottom center portion of the float chambers. Fuel must flow thru those jets before gaining access to any other fuel passageway.
The 2 idle air bleed jets in the top front of the carburetor for the 90hp should be part #324025 and be marked with the number 34 meaning that the inside diameter of the jet is .034 in size.
(Carburetor Float Setting)
(J. Reeves)
With the carburetor body held upside down, the float being viewed from the side, adjust the float so that the free end of the float (the end opposite the hinge pin) is ever so slightly higher (just ever so slightly off level) than the other end. And when viewed from the end, make sure it is not cocked.
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