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b. Inspection:
a. Cleaning:
Soak all castings and metal parts in a cleaning solution long enough to soften and loosen all foreign deposits. (Exception: The drip pl:.g should be cleaned with gasoline, since the cleaning solution used on metal parts will deteriorate the felt core in the drip plug.) If a commercial carburetor cleaning solvent is not available, lacquer thinner or denatured alcohol may be used. Place the parts and castings to be cleaned in a metal basket suspended in the solution to keep them out of the sediment which collects in the bottom of the container. Agitating the parts in the solution usually promotes a more thorough cleaning. After the parts and castings have soaked sufficiently, scrub away all remaining foreign matter with a stiff bristle brush. Blow out all passages in the castings with compressed air.
CAUTION: Never attempt to clean a passage with a drill, wire, or similar object, as this is liable to distort the passage and affect carburetor performance. Do not use a buffing wheel, wire brush, file, or other sharp instrument to remove carbon deposits, since these methods may also remove the protective plating on the part.
(2) Rinse the parts and castings in hot water to remove all traces of the cleaning solution, and dry them with compressed air.
NOTE: Gaskets and felt seals should not be exposed to the cleaning fluid. Most commercial solvents will
deteriorate these parts.
Major castings - Discard and replace if stripped threads, cracks, or damaged gasket mating surfaces are found. Check passages by directing compressed air into one end of every passage and feeling for a flow of air out the other end. (Refer to Section B - 110peration" page three for the location of the passages in the castings. )
Venturi - Discard and replace if cracked or badly nicked.
Choke shaft and throttle shaft - Discard and replace if the shaft is bent, if there is noticeable wear on bearing surfaces, if there are stripped threads, or if the fast idle lever riveted to the throttle shaft is loose.
(4) Float and Lever Assembly - Discard and replace the float and lever assembly if the floats leak, or if the assembly is corroded or damaged in any way. Shake the floats to determine if fuel has leaked into them.
Throttle plate - Discard and replace if edges are nicked or if the protective plating has been damaged, exposing bare metal to corrosion.
Choke plate - Discard and replace if the plate is bent or corroded, if the edges are badly nicked, or if the poppet valve spring is damaged. Be sure the shaft inside the poppet valve spring is clean and the poppet valve operates freely.
Main nozzle - Discard and replace if the fuel discharge passage in
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