Yamaha 9.9C User Manual (English)

Other manuals for Yamaha 9.9C

Questions and Answers:

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laurie90Jul 30, 2025
How to start a Yamaha 9.9C when the starter operates but the engine doesn't?
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  davidduranJul 30, 2025
  If your Yamaha Outboard Motor's starter is working but the engine won't start, there could be several reasons: * The fuel tank may be empty, so fill it with clean, fresh fuel. * The fuel might be contaminated or stale; in this case, replace it with clean, fresh fuel. * A clogged fuel filter can also prevent starting, so clean or replace the filter. * The spark plugs could be fouled or of an incorrect type. Inspect, clean, or replace them with the recommended type. * Also, check that the spark plug caps are correctly fitted and that the engine stop switch lanyard is attached. If none of these steps work, there may be an issue with the fuel pump, ignition parts, wiring, or internal engine damage, requiring service by a Yamaha dealer.
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Brian DavisAug 15, 2025
What to do if Yamaha Outboard Motor doesn't start, even though the starter is working?
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  Dr. Mark Holland PhDAug 15, 2025
  If your Yamaha Outboard Motor's starter is operating but the engine won't start, try these solutions: * Ensure the fuel tank has clean, fresh fuel. * Check and clean or replace the fuel filter if it's clogged. * Inspect the spark plugs; clean or replace them if they are fouled or incorrect. * Verify that the spark plug caps are correctly fitted and the engine stop switch lanyard is attached. * Also, check the ignition wiring for damage or loose connections. If the problem persists, it may be due to a faulty fuel pump, ignition parts, or damaged engine parts, which require servicing by a Yamaha dealer. You may also need to read the "STARTING ENGINE" section.
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Christopher MckenzieAug 19, 2025
What to do if my Yamaha 9.9C Outboard Motor idles irregularly?
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  uobrienAug 19, 2025
  If your Yamaha Outboard Motor idles irregularly, here are some things to check: * Make sure your spark plugs aren't fouled or the wrong type. Clean or replace them if needed. * Check for any blockages in the fuel system, like a pinched fuel line. * Ensure you're using clean, fresh fuel. * Also, check that your fuel filter isn't clogged; clean or replace it if it is. * Be sure that the air vent screw on the fuel tank is open, the choke knob is in the home position and the motor angle is at the normal operating position. Additionally, inspect the spark plug gap and adjust it if it's incorrect. If you've used the wrong engine oil, replace it with the specified oil.

Yamaha 9.9C Specifications

General

Engine Type	2-Stroke
Starting System	Manual
Gear Ratio	2.08:1
Full Throttle RPM Range	5000-6000 rpm
Fuel Induction System	Carburetor
Ignition System	CDI
Mixing Ratio	50:1
Max Output	9.9 hp
Fuel Type	Gasoline
Lubrication	Premix
Steering	Tiller