Yamaha 90A Service Manual (English)

Other manuals for Yamaha 90A

Questions and Answers:

O
oroblesAug 14, 2025
Why Yamaha 90A starter will not operate?
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  Jose RodriguezAug 15, 2025
  If your Yamaha Outboard Motor's starter won't operate, several factors could be at play. The battery capacity might be weak or low, requiring you to check its condition and potentially use a battery with the recommended capacity. The battery connections could be loose or corroded; ensure you tighten the battery cables and clean the terminals. A blown fuse in the electric start circuit could also be the culprit, so check for any electric overload, repair it, and replace the fuse with one of the correct amperage. Other potential causes include faulty starter components (have these serviced by a Yamaha dealer), the engine stop switch lanyard not being attached (attach the lanyard), or the shift lever being in gear (shift to neutral).
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marilyn27Aug 21, 2025
What to do if Yamaha 90A engine will not start but starter operates?
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  Morgan FisherAug 21, 2025
  If your Yamaha Outboard Motor engine won't start but the starter operates, here's what to check: The fuel tank may be empty, so fill it with clean, fresh fuel. The fuel could be contaminated or stale, requiring you to replace it with clean, fresh fuel. A clogged fuel filter needs cleaning or replacement. Make sure you are using the correct starting procedure. Inspect, clean, or replace fouled or incorrect spark plugs with the recommended type. Ensure spark plug caps are correctly fitted. Check for wear or breaks in the ignition wires, tighten loose connections, and replace worn or broken wires. Also, attach the engine stop switch lanyard and shift to neutral. For fuel pump malfunctions, faulty ignition parts, damaged engine inner parts, have it serviced by a Yamaha dealer.
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Susan ZavalaAug 25, 2025
How to troubleshoot a Yamaha 90A Outboard Motor when the starter will not operate?
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  sarahperezAug 26, 2025
  If the starter on your Yamaha Outboard Motor won't operate, begin by checking the battery. Ensure it's in good condition and has the recommended capacity. Tighten any loose battery cables and clean corroded terminals. Inspect the fuse for the electric start circuit and replace it if blown, after addressing the cause of the overload. Ensure the engine stop switch lanyard is attached and the shift lever is in neutral.
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Michael NguyenSep 12, 2025
How to fix excessive vibration in Yamaha 90A?
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  Dr. Rachel WoodsSep 12, 2025
  Excessive vibration in your Yamaha Outboard Motor can stem from several issues. A damaged propeller should be repaired or replaced. A damaged propeller shaft or steering pivot requires servicing by a Yamaha dealer. Remove any weeds or foreign matter tangled on the propeller. Check for and tighten any loose motor mounting bolts. Also, tighten or have serviced a loose or damaged steering pivot by a Yamaha dealer.

Yamaha 90A Specifications

General

Engine Type	2-Stroke
Horsepower	90 hp
Cylinders	3
Starting System	Electric
Steering	Remote
Full Throttle Operating Range	4500 - 5500 rpm
Gear Ratio	2.0:1
Fuel Induction System	Carburetor