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The Individual Runner carbs, DCOE, have individual Idle jets and mixture screws for each barrel. They also have an additional air bleed screws and lock nuts. This is not used for idle adjustment or idle quality. The settings for these screws should be closed. Speed screw ¼ to ½ turn in after contact with lever maximum. Mixture Screw 1 turn out from lightly seated. After confirming the linkage allows the throttle lever to seat against the Idle Speed Screw. Back off the Idle Speed Screw, then turn the screw in until it contacts the throttle lever and turn it in ½ turn. Turn in the Mixture Screw in until it “LIGHTLY” seats, then back it out 1 full turn. Loosen the 8mm wrench size nuts on the “air bleed” screws, turn in the air screws until it seats then tighten the nut. Now you may adjust the Idle Speed Screw. It should be sensitive and only require ¼ turn in or out to achieve the idle speed you like. These carbs are commonly used in pairs, this makes the synchronization important, be sure to bring the high flowing carb down to the low flow carb. Then bring them both up to “proper” Idle speed. The Idle Speed Screws are not opened more than ½ turn in. The accelerator pump by-pass valve is located in the bottom of the fuel bowl, one is required per carburetor. Critical! Be sure for initial carburetor set up all air by-pass screws should be in closed position. These are not commonly used in standard carburetor adjustment. When checking the seated position to make only light contact with seat, aggressive seating will damage needle and seat of carburetor, Start engine as long as engine starts and runs do not set up idle speed first. First adjustment if possible should be to find smoothest idle with each mixture screw on all carburetors.
Tags : air screws, carburetor adjustment, lock nuts, throttle lever, speed circuit, low flow, low speed, linkage, screw, accelerator, mixture, jets, pairs
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