Carb Body Castings: Blow air through the atmospheric vent holes
located on the dome of each float bowl chamber. Air should exit via hoses or
brass nipples. Inspect the emulsion tubes and passageways (cast towers that
jets thread into) for discoloration and debris. Clean interior emulsion towers
with a soft bristle gun cleaning brush. Clean the Venturi's (main carb bore).
Float Bowls: Inspect float bowls for sediment, gum or varnish,
crystallization, and defects. Clean all pipes, tubes, passageways, and embedded
jets with cleaners and compressed air. Remove and clean the drain screw and
area. Inspect bowl gasket and replace if necessary. Clean and inspect overflow
pipes and tubes, look for vertical cracks.
Floats: There are several types of float materials: plastic, brass, black
composite, tin, and others. Handle floats carefully. Avoid bending, twisting,
denting, or other means of mishandling. Most floats are adjustable by bending a
small metal tab near the float axle end. Do not change the float adjuster tab
unless tuning fuel service levels. Clean metal floats by soaking or spray
cleaners, if necessary. Replace other type floats if cleaning is necessary.
Clean the float axle or pin.
Notes: While carbs are apart, record the jet sizes. Look for a
very small number imprinted on the body of the jets. It should be the same
number for all. If you have dial or veneer calipers, measure and record float
heights. Perform measurements with floats just touching needle valves, though
not depressing the needle valve rods. -----
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