Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 290Get this manual
Resistance check: Resistance can be checked with the carburetor mounted on the motorMeasure the resistance between the 2P connector terminalsResistance 15.824.22
Operation check: Operation check must be made on the assembled carburetor1) Install vinyl tube or equivalent in the hole in the position of the carburetor shown (silencer plate side)
2) At room temperature, gently blow into the tube and verify air passes through the passage (fuel enrichment circuit is active)(FUEL ENRICHMENT
Connect the 12V battery positive (+) terminal to the brownlwhite terminal and negative (-1 to the blacklgreen terminal for about five minutesA gentle puff of air should not pass through (fuel enrichment circuit is fully closed)Note that inspection with the battery connected must be made quickly