Carburetor Body

To clean the idle tube (28) and idle feed hole, blow through the tip end. Do not use drills in end of tube or in small feed hole at bottom.

Clean the nozzle (29) bleed holes with a #54 drill (.055) and the main passage with a #17 drill (.173). Clean the high-speed needle seat holes with the exact drill size specified below for the particular carburetor being worked on.

Be extremely careful not to change size of holes during the cleaning operation.

Examine the two bowl vents in the carburetor body, to make sure both holes are open. One hole is the brass tube permanently swaged into the body. The second hole is located adjacent to the brass tube in the bowl cavity of the main body.

The idle or low-speed mixture channel at the top of the main body accommodates the idle tube (36). When fully seated, tube will extend beyond body face through gasket (2) into the throttle body corresponding hole. The idle tube serves two purposes, one for lining up the throttle body and the other to reduce the size of idle mixture passage. It is important that no leakage occurs between the main body and throttle body. Examine the joint faces for nicks or damage, particularly where the low-speed or idle mixture enters the throttle body.

The idle or low-speed air bleed is located in the idle mixture channel, top of main body, with the entrance on middle side of body through idle bleed tube (41) and nozzle vent housing (39). The air entering the bleed mixes with fuel delivered by idle tube and passes to the throttle body.

The nozzle (29) is air bled through a passage in the main body and nozzle vent housing (39), side opposite carburetor bowl.

Be extremely careful not to damage or enlarge any of these passages. Check the nozzle vent housing assembly fit on carburetor body. These parts should fit snug and without play.

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