#90 (Front), #87.5 (Rear) — Note: Jets may differ between front and rear cylinders. Pilot Jet (P.J.): #20 Jet Needle (J.N.): 2nd clip position (Standard)
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During assembly, ensure the slide housing o-ring is seated correctly. Because the recess is shallow, some builders use a fuel-resistant gasket cement like Permatex #85420 to keep it in place. mikuni bds26 service manual
Manages fuel at closed to 1/4 throttle. This includes the pilot jet and the pilot screw (often hidden behind a brass plug). #90 (Front), #87