Yamaha 9.9B - User Manual

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9.9B

15B

OWNER’S MANUAL

U.S.A.Edition

LIT-18626-04-89

63V-9-15 hyoshi 4/10/02 1:23 PM Page 1 (2,1)

Questions and Answers

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Kyle RiveraOct 29, 2025
Why Yamaha 9.9B engine will not start but starter operates?
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  Michael HortonOct 29, 2025
  If your Yamaha Outboard Motor engine isn't starting but the starter is working, several factors could be at play. Start by ensuring the fuel tank isn't empty and that you're using clean, fresh fuel. A clogged fuel filter could also be the culprit, so try cleaning or replacing it. Make sure the engine stop switch lanyard is attached and the shift lever is in neutral. Inspect the spark plugs; they may be fouled or of an incorrect type, needing cleaning or replacement. Also, check the spark plug caps to ensure they're correctly fitted, and examine the ignition wiring for any damage or loose connections. If the starting procedure was incorrect, refer to the "STARTING ENGINE" section. For fuel pump malfunctions, faulty ignition parts, or damaged engine inner parts, it's best to have your motor ...
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Richard DavisNov 13, 2025
What to do if Yamaha 9.9B engine idles irregularly or stalls?
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  samantha06Nov 13, 2025
  If your Yamaha Outboard Motor engine idles irregularly or stalls, there are several potential causes. Start by checking the spark plugs; they might be fouled or the incorrect type and may need cleaning or replacing. Ensure your fuel is clean and fresh, and inspect the fuel system for any obstructions like pinched or kinked lines. A clogged fuel filter could also be the issue, so clean or replace it. Make sure the air vent screw on the fuel tank is open and that the choke knob is in the home position. The motor angle could be too high, so return it to the normal operating position, and ensure the fuel joint connection is correct. Inspect the spark plug gap and adjust as specified. Check the wires for wear or breaks, tighten all loose connections and replace worn or broken wires. If you have...