Honda Outboards BF40A/BF50A Service Manual, Page 287Get this manual

Honda Outboards BF40A/BF50A Service Manual, Page 287

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BF40A-BF50A speed does not Increase: Faulty Automatic SE valveI I
Spark plug faulty
Clean and adjust or replace (See base shop manual)
Clogged fuel filter

Replace (see b