Apply grease to the tip of the adjusting screw threads.
О First synchronize the left two and then the right two carburetors by means of the left and right adjusting screws [А, С]. Then synchronize the left two carburetors and the right two carburetors using the center adjusting screw [В].
★ If the carburetor synchronization cannot be obtained by using the adjusting screws, check for dirt or blockage, and then check the pilot screw settings.
Special Tool - Pilot Screw Adjuster, A: 57001-1239
Check the carburetor synchronization again.
Note. Do not turn the pilot screws carelessly during carburetor synchronization. You may cause poor running at low engine speed.
For the models other than the California model, remove the carburetor vacuum hose plugs and carburetor vacuum hose fitting.
Check idle speed.